44 



short, reflected; columella subumbilicated ; aperture suborbiou- 

 lar, and with oblique rather distant costae. 



EMARGINULA. 



E. arata. Subovate, with numerous angular or acute ribs, 

 alternating in size ; crossed by fine regular striae ; apex nearly 

 central, pointed and incurved ; fissure wide, extending about 

 one seventh the length from the apex; inner margin waved. 



MONOCEROS. 



M. vetnsta. Subglobose, with revolving striae, obscure, except 

 the base, where they are distinct ; spire short, rapidly narrow- 

 ing to the apex, which is acute ; tooth short and robust, placed 

 at the termination of an exterior groove ; basal emargination 

 profound ; labrum acute on the margin. 



M. armigera. SYN. Melongena armigera (nobis.) More per- 

 fect specimens prove the existence of a tooth on the labrum of 

 this shell. 



ANCILLARIA. 



A. lynneoides. Subulate, with an elevated fold on the centre 

 of the columella ; labrum somewhat expanded. 



SOLARIUM. 



S. scrobiculatum. Slightly elevated, with smooth, somewhat 

 concave volutions, crenulated at the sutures ; periphery crenu- 

 lated ; beneath indented near the margin ; margin of the um- 

 bilicus profoundly crenulated ; aperture rhomboidal. 



S. stalagmium. Depressed, perlaceous, with two large cre- 

 nulated striae on each side whorl, and numerous smaller crenu- 

 lated lines ; volutions channeled at the suture ; periphery ob- 

 tusely rounded; beneath rounded with minute striae, and 

 irregular impressed lines diverging from the umbilical margin ; 

 umbilicus narrow ; aperture large, orbicular. 



S. funginum. Convex above, flat beneath ; volutions smooth, 

 with short raised lines diverging from the suture; peripl^ry 

 with an obtuse, slightly elevated, minutely crenulated carina; mar- 

 gin of the umbilicus profoundly crenulated, with a submarginal 

 impressed line, and diverging striae. 



8. axaeuutn. Discoid, with revolving acute lines; whorls with a wide in- 

 dentation at the suture ; submargin widely indented, and the periphery 

 acutely carinated ; beneath flattened ; umbilicus smooth ; aperture subovate. 



S. am&ntiHt. Depressed ; whorls smooth, with three raised lines at the 

 suture, the intermediate one smallest and the outer one crenulated; periphery 

 crenulated and bordered by a crenulated line ; beneath with an elevated 

 submarginal line; margin of the umbilicus profoundly crenulated, from which 

 diverge numerous strong lines, interrupted by two approximate impressed 

 submarginal striie, and two subcentral approximate impressed lines ; um- 

 bil.cus contracted. 



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