OSCUM. 221 



over the annulations ; aperture oblique, margined by a rib ; 

 septum mucronate, mucro dextral, sharp pointed. 



Length, -125 inch. 



Jamaica. 

 C. CORONATUM, Folin. PL 67, fig. 80. 



Yellowish gray, with wide, flatly rounded annulations and 

 minute interstices, decussated by prominent, distant rounded 

 longitudinal costse, with rather wide interstices, aperture bordered 

 by a tubercular rib ; septum mucronate, mucro dextral, sharp 



pointed. Length, '08 inch. 



Jamaica. 

 C. IRREGULARE, Folin. PL 67, fig. 82. 



Yellowish or grayish, with wide flattened annulations, becom- 

 ing higher and more convex towards the aperture, interstices 

 narrow, and longitudinally striate ; septum mucronate, the mucro 

 dextral, finger-like. Length, -16 inch. 



Bahia, Brazil. 

 C. PHRONIUM, Folin. PL 67, fig. 79. 



Shell well-curved, with numerous rounded annulations, and 

 narrow interstices, decussated by longitudinal distant narrow 

 sulci; mucro spinose. Length, '13 inch. 



Haiti. 

 C. COOPERT, Smith. PL 67, figs. 84, 85. 



Shell with about 24, somewhat rounded longitudinal ribs, 

 crossed by numerous annulations, which are less marked towards 

 the middle, white ; septum mucronate, with the apex inclining to 

 the left, when looking at the back of the shell ; operculum con- 

 cave. Length, *13 inch. 



New England, Long Island Sound. 



Because of C. Cooperi, Carpenter, Dr. Cooper changed the 

 name of this species to C. Smithii and Prof. Yerrill to C. costa- 

 tum, but as Smith's species was published before Carpenter's, 

 both these names fall into the synonymy. It is a pity that such 

 a little shell should be burthened with such a large synonymy 

 and for which there is no excuse. The desire to rush into print 

 is so overmastering that no one is deterred by such a slight 

 obstacle as being unable to refer to the literature of his subject. 

 The figure given by Yerrill represents the adolescent stage of 

 sculpture, with less numerous ribs (fig. 85). 



