554 Records of the Indian Museum. [Vol. VIII, 



mixed up with another species. In colour it is mostly blue-black, 

 paling towards the sole of the foot, darkest on the mantle. This 

 is oval, a simple shield with a very small opening at the extreme 

 posterior end, through which the white apex of the shell protrudes 

 a very short distance. The mantle is very finely papillate, and 

 so is the side of the foot posteriorly, the surface is more rugose 

 towards the head. There is a deep well-marked groove above the 

 peripodial margin, having an indistinct one above it, the strip 

 between being indistinctly segmented, the peripodial margin itself 

 is not very broad, and is fringed, what Mr. Kemp noted in the 

 living animal, much has disappeared in the spirit. It is however 

 streaked sparsely with black, for its whole length, somewhat larger 

 spotting occurs scattered over the side of the foot, in some of the 

 five specimens sent there is much spotting. The extremity of the 

 foot (pi. xlviii, fig. 6a) is square to the sole, the mucous gland 

 vertical and small, with a raised border extending to the keel of 

 the foot, but there is no overhanging lobe. The respiratory orifice 

 lies in the middle of the mantle on the right side, beneath a short 

 slit in the edge, a distinct line of separation, shown by a cicatrice, 

 can be seen between what is usually known as the right and left 

 shell lobes. The sole of the foot is most distinctly divided, the 

 central area broad. 



The visceral sac extends to the extremity of the foot, the liver 

 filling this part of the animal. 



Generative organs. Taken in mid-winter these are not in full 

 development, the hermaphrodite gland is unusually large, situated 

 far back near the extremity of the foot, and lying half buried in 

 the liver lobes, it is an elongate oval mass, with a smooth surface. 

 The hermaphrodite duct is very long and straight with no con- 

 volutions except just near the attachment to the albumen gland. 

 The organ is very small, with a curious short, pointed protuber- 

 ance. The oviduct was not developed. An amatorial organ is 

 present, long and straight. The spermatheca is elongately pear- 

 shaped, short. The retractor muscle of the penis is short, and 

 has its attachment below the anterior margin of the mantle zone, 

 other muscle attachments are on the posterior side. The sheath 

 is long and bent into an S-shape ; it bends sharply where the 

 retractor muscle is given off, and continues as a long epiphallus, 

 terminating in a short kalk sac, or blunt flagellum. 



The jaw (pi. xlviii, fig. to) is somewhat straight in front with 

 a small central projection. 



The radula formula is + 50. 3. 14. 1. 14. 3. 50 + or -|- 67.1.67 -|-, 

 the laterals may be ten more. 



The central tooth and admedian are well pointed, of the 

 usual form in Austenia and Girasia. at the transitional teeth 15th, 

 i6th and 17th, the plate narrows considerably, and there is a 

 small cusp below the point on the outer side, the succeeding teeth 

 are long, narrow and curved, the outer cusp well below the point, 

 gradually becoming smaller and the marginals at last very m.inute, 

 simple and aculeate. 



