Chloritis bifoveata (Benson, 1836)
“This is the most singular among the planorbular Helices which exhibit a concavity, and, as it were, an umbilicus on the spiral, as well as the basal face of the shell. The parietes of the true or basal umbilicus are more vertical than those of the spiral depression, and the excavation is deeper. The sculpture is peculiar, consisting of lines of granules crossing each other obliquely. The published species most nearly related to H. bifoveata are H. omicron, Pfr., H. shuttleworthi, and H. calculus.” (Benson, 1856)
Benson (1856) original descriptions on Helix bifoveata – “Testa umbilicata, oblato-globosa, utrinque concava, oblique striata, minutissime granulata, luteo-fusca, translucente; spira profunde excavata, perspective umbiliciformi; anfractibus 4½ angustis, convexis, recedentibus, ultimo prominente, superne compresso, globoso, caeteros occultante, subtus circa umbilicum mediocrem perspectivum compresse angulato; apertura verticali longissima utrinque testam superante, angustissime lunata, superne et infra subangulata; peristomate simplici, acuto, expansiusculo, marginibus remotis convergentibus, columellari brevi subverticali, leviter expanso.”
Helix bifoveata – “Diam. major 10, minor 9, axis 6 mill. Long, apert. 7, lat. vix 2 mill.” (Benson, 1856)
Type locality – “ad collem Therabuin vallis Tenasserim raro” Leg. W. Theobald (Benson, 1856)