MOLLUSCA OF INDIA. 123 



observed in the specimen dissected of a spermatopliore. The vas 

 deferens joins here. Thence a long duct leads posteriorly to the 

 retractor muscle ; it bends sharply forward in a short narrow tube 

 which leads into a much wider bulbous portion, this uniting with 

 the lower main short sheath first mentioned, leading to the genital 

 aperture. The swollen bulbous portion on being laid open is seen 

 to have papillate walls. 



This genus presents very few characters in common with Nilgiria 

 and Ratnadvipia, shown outwardly in the divided left dorsal lobes, 

 the general form of the foot and mucous gland, and internally in 

 the genitalia ; we do not find the caecum-like process below the 

 retractor muscle peculiar to those iSouth-Indian genera. The radula 

 differs also from them. It approaches nearer to Hemiplecta, as 

 shown in the generative organs, but in form of the central teeth 

 and the shell-lobes considerable variation is to be seen. On the 

 whole it stands apart, and the differences are sufficient to give it the 

 subgeneric position I have assigned to it under the title Ilaughtonia, 

 named after that gallant, talented, and distinguished officer, its dis- 

 coverer, who at one time was serving in the Andamans, and collected 

 there for Mr. Benson. 



Subgenus Nilgikia. 



(Continued from Part VIII. Vol. II. pp. 77-81, 

 Plates LXXX.-LXXXII.) 



NiLGiKJA LiGULATA, Fcrussac. (Plate XCVIII. figs. 1-1 d.) 



Helix (Heliogena) ligulata, Fer. Hist. Moll. pi. 31. fig. 2; Pfr. 

 Symb. i. p. 38. 



Helix ligulata, Chemn. ed. ii. Helix, no. 174, t. 33. figs. 1, 2 ; 

 Pfr. Mou. Hel. vol. i. p. 71 ; Reeve, Couch. Icon. Ixxvi. fig. 395 ; 

 Hanley, Couch. Ind. p. 14, pi. xxvii. fig. 2 (good figure). 



Nanina ligulata, Beck, Ind. p. 4. 



Hemijjlecta (sec. A) ligulata, Theob. Supp. Cat. p. 21. 



Nanina (Xesta ?) ligidata, Nevill, Hand-list, p. 50 : Madras, 

 Chaibassa in Chota Nagpur to Bhagulpur and Patna. 



Hemiplecta ? ligulata, G.-A. J. A. S. B. vol. xlix. pt. 2, 1880, 

 pi. ix. fig. 3 ; copied from a drawing of the animal by a native 

 artist, under the superintendence of Ferd. Stoliczka. 



Xesta ligulata, Albers, Die Heliceen, p. 50 (1860) ; Reis. Archipel 

 Philipp. p. 65, pls.'iii., v., vi. (1870) ; Clessin, Nomen. Helic. p. 41. 



ManiiUi (Xesta) ligidata, Tryou, Man. Couch, ser. 2, vol. ii. p. 78. 



In this species received from Madras, on the body-whorl, side, 

 and inside the mantle-zone a very fine line may be seen following 

 the edge, and thus defining a narrow hem-like band (vide 

 Plate XCVIII. fig. 1 a), but there is no shell-lobe on the right side, 

 only a narrow left shell-lobe. The left dorsal lobe (fig. 1 b) is in 

 one long continuous piece, but there is only a small notch indicating 



