XXII. OBSERVATIONS ON A CARNIVOR- 

 OUS LAND-SNAIIv. 



By N. Annandale, D.Sc, F.A.S.B., Director, and B. Prashad, 



D.Sc, Assistant Superintendent, Zoological Survey of India. 



» 



In the genus Ennea, H. and A. Adams, there are at present 

 included a number of species which differ greatly in the complexity 

 of the armature of the mouth of the shell. These were separated 

 into subgenera b};- Pfeiffer in Vol. V of his Monographia Helicorum 

 Viventiuni as long ago as 1859, '^^t we have been unable to find 

 any detailed description of the armature in anj^ of the more complex 

 forms that ma}^ be accepted as Ennea, s.s.^ All descriptions 

 of shells of this type that we have been able to find refer merely 

 to the external appearance of the aperture and fail to discuss 

 the internal structure of the folds and teeth connected therewith. 

 As we have recently had an opportunity^ of examining the com- 

 monest and most widely distributed species of the genus both living 

 and preserved, we propose to publish here an account of the 

 structure of the shell and to add certain observations on other 

 points of interest. 



Ennea bicolor (Hutton). 



igo8. Ennea bicolov, Blanford and Godwin-Austen, Faun. Brit. Ind., 

 Moll. I, pp. 19, 20, fig. 12. 



For the synonomy and literature of the species see the reference 

 cited. Published descriptions of the shell omit several particulars 

 of interest in connection both with the aperture and with other 

 parts. We give, therefore, as a preliminary to the description of 

 a new insular race, a fresh description of the shell of the species. 



The shell is small but somewhat variable in size, with from 

 6 to ^\ whorls, subcjiindrical, with the apex blunt ; hyaline and 

 almost colourless when fresh but rather thick. The whorls are 

 never more than sHghtly swollen. Their proportions differ some- 

 what in different forms of the species. The body-whorl is 

 compressed from side to side and bears on each side a funnel-shaped 

 depression. That on the inner aspect surrounds the umbilicus, 

 which is completely closed. The sculpture consists of very fine, 

 straight vertical ribs, which are strongly developed just below the 



^ H.and A. Adams in their original description of the genus, as a subgenus 

 of Pupa, selected no type-species but mentioned E. bicolor first on their list, see 

 Gen. Recent Mollusca, II, p. 171 (1858). Whether we accept E. bicolor (with 

 Blanford and Godwin Austen) as the type-species of the genus, or E. elegantior 

 (Pfeiffer) with von Martens and Nevill, Hiiitonella, Pfeiffer is sj-nonymous with 

 Ennea, s.s. 



