base and narrowly umbilicate. The width of the shell is 10 mm. The height of the shell is 9 mm. Anatomy The animal is bluish-black, with the foot-sole perhaps a shade lighter in colour. On the head and neck are a few regular rows of rugae, somewhat quadrate in outline; on other parts of the body the rugae appear to be oval-shaped, irregular in size, and not forming continuous rows. The mantle has a sharp even margin, and a deeply incised line or groove rather less than 2 mm from the edge. On the underside of the mantle is the usual prominent lappet which conceals the respiratory and anal pores, and in addition to this is a long narrow fold on the left side. The retractor muscles: The buccal mass and pedal retractors are fused together posteriorly where they unite with the columella of the shell. The buccal retractor rests dorsally on the pedal muscles, and forms a broad powerful band. The pedal retractors are continuously attached to the foot, and there are no free progressively attached pedal retractors as in genus Helix. The ocular retractors branch from the pedal muscles; they bifurcate towards their anterior ends, and supply the inferior tentacle retractors. The length of the radula is about an inch, and 0.4 inch in width at the anterior end, tapering to a point posteriorly, with about 104 transverse rows of denticles (tiny teeth). The rows of denticles are forming an obtuse angle of about 130°, salient posteriorly. There is about 100 small denticles in each row, that described and figured by Captain Frederick Hutton with formula 50-0-50, while Robert C. Murdoch gave the formula 52-0-52. Hutton described them like this: Denticles are all aculeate, and similar, with simple bevelled tips. The first five lateral denticles are small. From the sixth they gradually increase in length to about the thirty-fifth, and then get smaller. Murdoch described them like this: A few of the innermost denticles, usually not more than two on each side, are small and very slender. Occasionally one of these slender spicula-like denticles is somewhat separated from the adjoining denticle, and where this occurs it gives to the row the appearance of a central denticle. There is no jaw. The digestive system contains enormous buccal mass is and muscular development. Its posterior end is curved down and forward, and a powerful ventral muscle firmly binds it to