CHORUS. 197 



It is a question whether this ought not to be referred, like P. 

 Anstralis, to Eburna, under the subgenus Zemira. 



P. ANCILLA, Hanley. 



Yellowish-red ; oblong conical, solid, rather smooth ; last 

 whorl ventricose, pallid in the middle, widely concave above, 

 slowly narrowing and with a wide sulcus below. 



L. 1-63, lat. -85 inch. 



Caffraria. 



Said to " remind one alike of Ball la and Ancillaria. The basal 

 distinctive groove is nearly square-cut ; its bottom is closely 

 traversed by wrinkles of increase, and is flat, not concave." Not 

 figured, and I have not seen it. 



P. NASSOIDES, Hanley. 



Small, solid, conic-oval, smooth, yellowish-red ; spire one-third 

 the total length, with somewhat obtuse apex; aperture small, 

 sub-elliptical, narrow ; scarcely exceeding half the total length ; 

 columella white, thick, without posterior callus but obsolete^ 



uniplicate anterior^. L. '37, lat. -19 inch. 



Malabar. 



The only specimen ; ' bears the aspect of being fully adult. Its 

 outer lip seems thickened externally, and the tooth-like projection 

 over the characteristic groove is rather conspicuous." Not figured. 



Cen us CHOBUS, Gray. 



To this group have been referred ( 'It. iitonocerox. Desh. (= Monoc. 

 yiganteum, Lesson), Ch. xanthostoma, Brod. (= Trophon), and 

 Ch. Belcherij Hinds. These three species are certainty repre- 

 sentatives of three distinct genera, of which the last only remains 

 to represent the genus. The dentition of Ch. Belcheri (PI. 42, 

 fig. 12), reminds one of the Buccinidse more than any other group, 

 and is nearest to that of the sub-family Photinae ; but the shell 

 does not bear out this relationship, its spines, peculiar varices 

 and long canal suggesting Trophon, from which it is distin- 

 guished by having a purpuroid operculum and the tooth of H 

 Monoccrox. A naturalist fond of making systematic groups 

 might construct for this species a family, to follow, perhaps, 

 Ptychatractidae and intervening between the latter and Buccinidse. 



