XXX11 KEY TO UROCOPTID^:. 



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^:. 



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. 



b. 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. 



ft 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 



