118 CRUCIBULXJM. 



Yar. QUiRiQUiNA, Lesson. PL 32, figs. 30, 31. 



Finely radiately costiilate, or smooth. Mutations of this 

 form have been called C. trigonale, Ads. and Reeve (fig. 25), G. 

 ferrugineum, Reeve (fig. 26), G. lignaria, Brod, (figs, 27, 28), 

 C. tenue, Brod. (fig. 29) and G. spectrum, Reeve (figs. 30, 31). 



Yar. AURicuLATUM (Chemn.), Auct. PI. 32, figs. 34, 35. 



Whitish or light brown, brown-speckled or unicolored, de- 

 pressed, rugosely irregularly radiately ribbed. 



West Indies. 



It can scarcely, except by locality, be distinguished from flat 

 specimens from the West Coast, 3'et the flatter rude form is 

 predominant in the West Indies, whilst in the former localities 

 it is exceptional. The sj'nonj'my includes G. Guvieri, Desh., 

 C. planatum, Schumn., G. Garihbeense, Carp. 



Yar. viOLACEUM, Carpenter. PI. 32, figs. 36, 37. 



Ribbed and colored like the preceding species, interior light 

 violaceous or violaceous brown. p ■, 



Yar. TUBiFERUM, Lesson. PI. 32, figs. 32, 33,38; PI. 33, figs. 

 39-43. 



Closely radiately striated, distantl}'^ radiately costulate, the 

 riblets prickl}^ with short or long tubular hollow processes. 



West Goast of America, Ghili to Galifornia. 



Topical specimens of this form might readily- be distinguished 

 as a species, but the intermediates connect it with var. quiriqui- 

 num. It is better known under the later name of G. spinosum, 

 Sowb. (fig. 38). Other sj^nonyms are G. cinereum, Reeve (fig. 

 39), G. hispida, Brod. (fig. 42), G. reziza, Gray, var. compresso- 

 conicum, Carp., G. maculatum, Brod. (fig. 43), and G. striatum, 

 Brod., not Say (= G. auritum, Reeve, figs. 32, 33), the last two 

 variations connecting with the smooth or finel}^ striate variety. 



C. STRIATUM, Say. PI. 33, figs. 44, 45. 



Aperture orbicular, apex usually rather high, beaked, 

 surface radiately striate, cup broadly open, attached fully one- 

 third of its circumference; brownish white, brownish within. 



New England to New Jersey. 



The type of the section Dispotiiea, Sa^-, which has no claim to 

 be separated from the main group. 



