350 



Records of the Indian Museum. 



IVoi.. XIII, 



Ariophanta infausta, W. Blf. 



Forbes and HanlcN', Couch. Iiid., pi. clix, figs. 2, 3 {Helix). 



\V. T. Blanford, Jouru. As. Soc. Bengal, XXXV (2), 1S66, p. 36 



\_Na II ilia ( Macrocli la in ys)~]. 

 W. T. Blanford and H. H. Godwin-Austen, Faun. Brit. Iiul., Moll. 1 



1908, p. 133 (Macrocli laviys). 



Locality. — Banks of Chilka Lake. 

 Sculpture very finely decussate. 



Animal (fig. i, A, B, C). The spirit specimen is colourless, 

 with the exception of a darkish narrow patch on the right dorsal 



lobe near the rectum, and a 

 conspicuous long narrow black 

 line on the visceral sac border- 

 ing the renal organ (fig. i, B). 



The sole of the foot is divided 

 and wide V-shaped segments 

 cross it. The peripodial margin 

 is broad with the usual two 

 grooves above it ; they are indis- 

 tinctly seen in these specimens. 

 The mucous gland at the ex- 

 tremity of the foot is large and 

 vertical (fig. i, D). 



The edge of the peristome is 

 overlapped slightly by the man- 

 tle edge {m), and there is a thin, 

 narrow separate expansion of 

 this for a short distance back- 

 wards over the shell on the 

 upper margin, a character I have 

 never yet met with in any other 

 species. It is due no doubt to 

 the very perfect state of pre- 

 servation and freshness of these 

 specimens. The right dorsal 

 lobe {rd. I) is large triangulate, 

 the left in two parts, quite 

 separate ; the anterior part is 

 small in comparison with the 

 right dorsal, and a posterior 

 [post. Idl.) which is narrow and 

 elongate and extends narrowing to the hinder part of the shell. 

 From this it is clear that the position of this mollusc is in the Ario- 

 phantinae and certainly not in the Macrochlamyinae, which section 

 of it only the generative organs will show. 



Generative organs (fig. 2, A). The species has a long 

 caecum or diverticulum [crp.) at the end of which the retractor 

 muscle is given off. The kale-sac or flagellum [fi.) is short, the 

 spermatheca {sp.) is globose and sessile; the amatorial organ 



Fig. I. — Ariophanta in/ansta, W. 



A, B, C. Animal. 

 D. Extremity of foot. 



Blf. 



