134 CERITHIUM. 



C. concisum, Hombr. et Jacq., C. obscurum, and C. gemmulatum 

 (figs. 57, 58), of the same authors, C. carbonarium, Sowb., not Phil., 

 C. breve, Quoy, and C. moniliferum, Dufresne (fig. 35), are synonyms. 



Var. VARIEGATUM, Quoy. Figs. 41, 43, 45, 65, 66. 



E. A. Smith, in the Mollusca of the Alert Expedition, refers C. 

 variegatum, Quoy, to the preceding species ; judging from the origi- 

 nal figure, and a large series of specimens evidently identical with 

 it, none of them having the varix on the back, I believe that it is a 

 small variety of C. morus, averaging 15 mill, in length, tessellated 

 or irregularly variegated with dark brown on the tubercles, the 

 aperture often violaceous. As to the C. variegatum figured in 

 Reeve's Iconica (figs. 29-31), that appears to represent variations of 

 C. morus depending on the slight development of tubercles and 

 lighter, blotched coloring, but is much closer to the type than Quoy's 

 species. 



C. humile, Dunker (fig. 66), C. nivosum. Sowb. (fig. 45), 0. 

 gemma, Sowb. (fig. 41), C. California}, Sowb. (fig. 43), and (X 

 acutum, Hombr. et Jacq. (fig. 65), are probably synonyms. 



Var. PATIENS, Bayle. Figs. 36, 37, 47. 



The longitudinal ribs more developed, making the tubercles 

 larger and more irregular in development ; yellowish white or greyish 

 irregularly blotched and spotted with chocolate, sometimes chocolate 

 color with whitish markings. 



Polynesia. 



A much rougher shell than the typical C. morus, the tubercles 

 larger and the intermediate spiral strise faint or obsolete. Usually 

 recognized as a species, under the name of C. rugosum, Wood, which 

 is preoccupied by Lamarck for a fossil species. The characters 

 appear to merge gradually into those of the type. C. tuberculatum, 

 of Reeve's Iconica, is a synonym, and C. inuxicitm, Hombr. et Jacq. 

 (fig. 47), is a small form of it. 



Var. BIFASCIATUM, Sowb. Figs. 39, 40, 55. 



White, with a chestnut band on the spire, and two bands on the 

 body whorl. 



Philippines. 



Probably C. vittatum, Sowb. (fig. 55), changed by Bayle to 0. 

 Uranus, because of the fossil C. vittatum, Lam., is a depauperate 

 young shell of this form. I add C. nigrofasciatum, Sowb. (fig. 40). 



