Cryptaustenia partridgei Collinge, 1902
“Body cavity not extending posterior to the visceral mass. Intestinal tract short. Generative organs Parmarion-like. Well developed penis with beak-like head, no penis papilla. Dart-gland and dart-sac, latter containing fleshy dart.” (Collinge, 1902)
Collinge (1902) original descriptions on Apoparmarion partridgii – “Animal yellowish-brown, head bluish, tentacles yellow; mantle blue, coarsely granulated, rising upon the shell on all sides, on the right side posteriorly a large wing-like lobe covers the apex of the shell. Body laterally divided up into somewhat diamond-shaped figures by a series of oblique lines, Rugae small. Peripodial groove distinct. Foot-fringe yellow, no lineoles. Foot-sole yellow, divided into median and lateral planes. Caudal mucous pore not extending to the foot-sole. Shell amber coloured, thin, membranaceous, apex distinct, whorls 2.”
“The alimentary canal – The intestinal tract is both short and simple. Commencing at the fairly large buccal cavity, the oesophagus passes off from the dorsal side, and after a short course enters the wide pyriform crop, which has, at its posterior end, a sharp constriction marking the division between the crop and the ill-defined stomach. The intestine passes off from the posterior end of the stomach, and making a bend forward and to the right side forms the second loop of the intestinal tract, then gradually narrowing, a very short backwardly directed loop follows, which again bends forward to form the rectal portion, and terminates at the anus. Lying at each side of the forepart of the crop is a conspicuous salivary gland, which gives off a duct opening at the side of the oesophagus, on the dorsal region of the buccal cavity.” (Collinge, 1902)
“The generative organs – The form and general character of these organs at once indicate the Parmarion relationship of this genus. The vagina, which opens into the vestibule by an opening commin to this organ and the dart-sac, is short and wide; at its posterior end it becomes constricted, and on the right side the duct of the receptaculum seminis opens into it. Beyond the constriction is the free-oviduct, which at first is a wide, sac-like cavity, suddenly narrowing into a tube, which as it passes backward gradually widens until it joins the oviducal portion of the common duct. Externally the lower portion has its wall thrown into a series of folds which give it a fluted appearance. The penis is a long tube-like organs, with a sharply differentiated beak-like head. At the distal end of the tube-like portion, the retractor muscle is inserted. The two portions of the penis are connected together by a short neck. The head is marked by a series of crescent shaped constrictions, while juct below the point where the vas deferens joins the penis, there is a peculiar little outgrowth. Internally the cavity of the penis differs considerably from the external form. Commencing as a narrow tube the lumen widens until about the middle of the penis, then narrowing somewhat abruptly it gradually becomes less, and passing through the neck as a very fine tube it expands in the first portion of the head into a globular sac, which is connected on its ventral side with the vas deferens. The remaining portion of the head is solid. The dart-gland and the dart-sac are of about equal length, and similar in shape. The external wall of the sac is marked by a series of ring-like indentations. Internally there is a small fleshy dart, the surface of which is minutely studded with fleshy papillae. No trace of a muscle at the distal end of the dart-gland was observed.” (Collinge, 1902)
“The free muscles - The buccal retractor divides anteriorly into two bands which are inserted into the posterior ventral portion of the buccal cavity. Both superior and inferior ventral portion of the buccal cavity. Both superior and inferior tentaculars joins to form a common tentacular retractor, and are exactly the same on both sides. The columellar muscle is short and small.” (Collinge, 1902)
Apoparmarion partridgii – “Length (in alcohol) 25 millim. Shell; maj. Diam. 9.5, min. 5 millim.” (Collinge, 1902)
Type locality – “Gunong Inas, 3500 ft., State of Perak” (Collinge, 1902)