146 CERITHIUM. 



C. OBELISCUS, Brug. PL 27, figs. 39, 40. 



Whorls with tuberculated spiral ribs and intermediate granulated 

 spiral striae, the tubercles more prominent on a slight shoulder of 

 each whorl; yellowish white, more or less thickly spotted and 

 clouded with chestnut or chocolate; last whorl with an obtuse 

 lateral varix. Length, 2-2'5 in. 



East Indies, Polynesia, Mauritius. 



It is C. Sinensis, Gmel. A smaller form, in which the sculpture 

 is sharper has received the name of C. cedo-nulli, Sowb. (fig. 40). 

 C. CORDIGERUM, Bayle. PL 27, fig. 41. 



Shell finely, closely, spirally striated, with a line of tubercles at 

 the suture, and a second, less prominent series below it on the spire, 

 two or three inferior distant riblets on the body- whorl ; whitish or 

 yellowish brown, the riblets of the body-whorl often articulated 



with chestnut. Length, T5 in. 



Australia. 



Notwithstanding the difference in the sculpture I suspect that 

 this will prove to be a mere variety of C. obeliscus. It was described 

 by Lamarck as C. semigranosum, but as that author previously used 

 the same name for a different, fossil species, Bayle changed it as 

 above. 

 C. PULCHER, A. Ad. PL 27, fig. 42. 



Spirally striated, obsoletely longitudinally ribbed, with a row of 

 nodules at the suture, and a varix on the last whorl ; yellowish, with 

 chocolate spots between the sutural nodules. Length, 2 in. 



N. Australia. 



. GEMMATUM, Hinds. PL 28, figs. 44, 45 ; PL 27, fig. 43. 



Spirally grooved, the interstices more or less tuberculated, a 

 stronger band of tubercles next the suture, body whorl flattened in 

 front, with a large lateral varix; yellowish white, marbled and 

 spotted with chestnut or chocolate. Length, T5-2 in. 

 Mazatlan to Panama ; Viti Islands ; Australia; Indian Archipelago. 



The West American localities are for the type, the others for C. 

 articulatum, Ads. and Reeve (fig. 45), which I cannot separate even 

 as a variety ; C. tenuisculptum, Sowb. (fig. 43), is another synonym. 

 C. SEMINUDUM, Sowb. PL 28, fig. 46. 



White, spirally grooved, whorls angulated above the middle, 

 armed with three series of large, sharp tubercles, body- whorl with- 

 out tubercles below. Length, 1-25 in. 



New Caledonl'i. 



