460 % SUCCINEIDJE. 



Yar. subcostulata, Blanford. 



Blanford, torn, cit., p. 23 ; Pfeiffer, Novit. Conch, ser. 1, iv, 1871, 

 p. 13, pi. 112, fig. 5; Theobald, Cat. Laud and Freshw. Shells 

 Brit. India, 1876, p. 32. 



" Costulato-striata, lira infra- suturali validiori." (Blanford.) 



Hob. India : Pooruiidhur. 



Differs from L. rupicola principally by the raised spire, but the 

 siphonal furrow is less pronounced than in its ally. 



The British Museum contains three specimens from the collec- 

 tion of H. Adams, which are smaller than the type, since they 

 only measure 5 x 3-75 x 1*75 mm. On the other hand, four shells 

 in the Cuming collection, without indication of habitat, are 7 mm. 

 in length. 



Genus CAMPTOCERAS, Benson. 



Camptoceras, Benson, Calcutta Journ. Nat. Hist, iii, 1843, p. 465 ; 

 A. M. N. H. ser 2, xv, 1855, p. 10 ; Adams, Gen. llec. Moll, ii, 

 1855, p. 258; Godwin- Austen, Quart. Journ. Geol. Soc. London, 

 xxxviii, 1882, p. 220 ; Fischer, Man. Conchyl, 1883, p. 511. 



TYPE, C. terebra, Benson. 



Range : India. 



Shell sinistral, imperforate, elongate-elliptic, spire solute, apex 

 somewhat acute, suture widely and deeply excavated. Whorls 

 3-4, narrow, elongated, keeled above and below, flattened, apical 

 whorl elongate-acuminate, exserted. Aperture solute, entire, 

 large, not equalling the spire, elongate-elliptic, narrow above, 

 arcuately angulated above and below. Peristome acute. 



Animal with two filiform, obtuse tentacles. Eyes large, placed 

 between the tentacles. Mantle not extending beyond the lips 

 of the shell. Foot short, scarcely exceeding the length of the 

 aperture. 



Anatomy unknown. 



Considerable difference of opinion appears to exist regarding 

 the systematic position of this genus. Benson considered it to be 

 intermediate between Limncea and Ancylus, while Nevill was con- 

 vinced, from the recorded habitat, as well as from the characters 

 of the shell itself, that it would prove to be a sinistral form, closely 

 allied to Succinea. Chenu and Fischer, on the other hand, placed 

 it near Plujsa. The animal unfortunately has never been examined 

 anatomically, arid the point can consequently not be definitely 

 settled. I am inclined to favour Nevill's views and therefore 

 retain it in the family Succineid*. 



In 1882 Lieut.-Colonel Godwin-Austen referred a fossil form 

 from the Eocene, found at Sheerness, to the present genus *. The 

 piece of rock containing these fossils, several in number, now 



* Camptoceras priscurn, Quart. Journ. Geol. Soc. London, xxxviii, 1882, 

 p. 220. pi. 5, figs. 1-5, and var. obtusum, pi. 5, figs. 6, 7. 



