XXX11 KEY TO UROCOPTID^E. 



straight transverse rows; central teeth about as wide as 

 the adjacent laterals. Jaw either striate, nearly smooth, 

 or widely plaited, the sculpture not converging mesially. 

 EUCALODIIN^E. 



a. Teeth of the ordinary Helicid form, the ectocones (when 

 present as distinct elements) attached basally on the 

 side of the main cusps, as usual. 



&. Ectocones developed on all the lateral teeth, and, at 

 least minutely, on the central; cusps of the mar- 

 ginal teeth simple, never bifid. Shell rather large. 

 c. Axis of the shell solid, slender and straight. Adult 

 shell subcylindric, decollate, the lost protoconch 

 ribbed; sculpture peculiar, of dense, waved striae. 

 Haiti. Archegocoptis, xv, p. 301. 



c 1 . Axis slender, solid or minutely perforate, either 

 straight, sinuous, or bearing a compressed spiral 

 lamella, median in each whorl ; shell subcylindric, 

 broadly truncate. Eucalodium, xv. p. 1. 



c 2 . Axis very slender, imperf orate and simple; shell 

 tapering, entire, the early whorls costulate. 



Berendtia, xv, p. 57. 



c 3 . Axis moderately strong, minutely perforated, 

 bearing a sub-basal cord or lamella in the last 

 whorl or two only; shell truncate, rapidly taper- 

 ing above. Anisospira, xv, pp. 24, 298. 

 c 4 . Axis hollow, tubular, variously sculptured. 



Ccelocentrum, xv, p. 30. 



& 1 . No ectocones developed on the central and inner 

 lateral teeth, which bear broad, more or less pointed 

 mesocones only; ectocones appearing on the transi- 

 tion and marginal teeth, both cusps sometimes split 

 on the latter. Shell small, cylindric, with conic 

 summit and entire spire, the protoconch smooth. 



Holospira, xv, pp. 66, 300. 



a 1 . Central and inner lateral teeth with broad, rounded 

 mesocones and very small ectocones distinctly separ- 

 ated from them basally (xv, pi. 50, fig. 7). Marginal 

 teeth wide and short, with both ectocone and mesocone 



