CERITHIUM. 131 



C. CUSTOS, Bayle. PI. 23, figs. 95, 96. 



Turreted, whorls strongly, tubercularly shouldered, elsewhere 

 granular, varicose ; orange-brown, whitish on the tubercles. 



Length, 23 mill. 



Philippines. 



Described by Sowerby as C. coronatum, a name preoccupied by 

 Bruguiere for a fossil species. I have a suspicion that this will prove 

 a denuded state of the next species. 



C. PLAXUM, Phil. PI. 23, figs. 98, 99, 97. 



Narrow, flat whorled, subcylindrical, distantly, rather indistinctly 

 longitudinally plaited, last whorl crenulately ribbed on the peri- 

 phery and somewhat concave below, canal produced ; white, with a 

 single band of chestnut on each whorl. Length, 15 mill. 



Philijtjthic*, Viti Islam!-". 



( '. invaginatum, Gould (fig. 97), from the last named locality, is a 

 synonym. 



C. SALEBROSUM, Sowb. PI. 23, figs. 100, 1. 



Slightly, tuberculately shouldered, with a pair of granulated 

 revolving riblets on the lower part of the body whorl, ribbed, 

 crossed by spiral lines ; yellowish brown, more or less tinged with 

 chestnut between the ribs. Length, 1 in. 



Lord Hood's Island. 



I am almost certain that this is simply a more flourishing state of 

 C. ciisto*, and consequently identical with C. plamim. 



C. BALTEATUM, Phil. PI. 23, figs. 2, 3. 



Varicose and longitudinally ribbed, tuberculated, swelled above, 

 narrowed near the suture, last whorl with two strong tuberculated 

 ribs below the periphery, and contracted below them ; whitish, -with 

 a narrow, central, orange brown band, or brownish with a central 

 white band. Length, 23 mill. 



Philippines. 



This may be another state of C. plan-urn, Phil. ; it is at least very 

 closely related to it. 



C. RUBUS, Martyn. PL 23, figs. 4-9, 15. 



Varicose, brownish or brownish white, the whorls longitudinally 

 plicate and spirally striate, with three spiral rows of tubercles on 

 the spire whorls and about seven rows on the body. Length, 1 in. 



Ceylon ; Singapore ; Philippines. 



