iQiS.] H H. God WIN- Austen : Mollusca, IX. 613 



Genitalia. The shaft of the penis (fig. 7, A) is very long, atten- 

 uate, sharply folded and bent on itself ; the retractor muscle is 

 given off on the side, as it lies folded up; the epiphallus {ep) is a 

 thinner tube with a small enlargement or sharp bend, indicating 

 where the spermatophore is developed and here the vas deferens 

 joins it, its position being close and opposite to the male genera- 

 tive aperture and junction of the free oviduct. 



This free oviduct is very long, and just below the commence- 

 ment of the vas deferens there is a short solid bulbous spermatheca 

 (fig. 7, D and C) with quite a strong retractor muscle, which ex- 

 tends a long way backwards. The walls of this sac are very thick 

 and on the inside surface have many parallel fine wavy raised 

 ridges. The oviduct and prostate are much drawn out and so is the 

 albumen gland, all lie parallel to the muscles from the buccal mass 

 and eye tentacles, and last of all lying between two of these the her- 

 maphrodite duct may be followed towards the apex of the shell. 



The jaw (fig. 7, E) is very solid with about 16-18 smooth, 

 parallel plates. 



The radula (fig. 7, F) wus extracted nearly complete. The cen- 

 tre tooth and admedians up to the 13th are short, blunt and round- 

 ed, on ample somewhat elongate plates, becoming more pointed 

 externally. At the 14th a slight shoulder is apparent which gradu- 

 ally enlarges into a basal cusp, while the mesocone has also 

 lengthened at the 23rd and 25th tooth. Another change then 

 takes place, both points become double as in the 27th and 30th ; 

 these outermost teeth are very irregular in their outline and being 

 very thin are often broken. 



Helix catostoma, W. Blf. 



An extract from my field-book may be of interest here, now 

 that I am describing a species so closely allied. vShell subconoidal, 

 openly umbilicated, whorls 7, close wound, covered with an epider- 

 mis having a rough surface as if hairs had been shaved off it. The 

 aperture turns suddenly down close behind the peristome and is 

 slightly reflected at the margin. 



The animal is a true Helix with no gland, foot painted behind. 

 Body of a pale pink grey, under surface and margin of the foot of 

 a green tint. Tentacles short, dark coloured. Wooded hills east 

 of the Kopili River, particularly abundant in the Diyung Valley. 



The absence of a dart-sac with accessory organs in all the 

 preceding Indian species of this group of the Mollusca, combined 

 with other characters, appears quite sufficient to separate them 

 generically from specie^ inhabiting Europe {Eulota), and China 

 and Japan {Plectotropis) including CEgista in which some have 

 been placed — notably catostoma. This removes both these genera 

 from the Indian region. I am induced also from a knowledge 

 of the animals of six species to divide the Indian, for they fall into 

 two very well-marked sections, shown not only by the shell but 

 in the internal anatomy, as represented by H. huttoni of the N.-W. 



