CERITHIUM. 123 



C. ERYTHR^EONENSE, Lam. PI, 20, fig. 16. 



Shell smaller than C. nodulosum, with similar but neater sculp- 

 ture ; greyish with numerous small chestnut spots more or less con- 

 fluent into longitudinal streaks. Length 2'5-3 in. 



Bed Sea. 



I suspect that this will prove a synonym or at least only a 

 variety of C. nodulosum. The synonyms are C. stri<itiun, Schrceter, 

 and C. tuberosum, of Reeve and Sowerby. The latter name being 

 preoccupied by Grateloup for a fossil species, Bayle has changed it 

 to C. omisswn. 



C. COLUMN A, Sowb. PL 20, figs. 17-20. 



Shell with usually alternate larger and smaller spiral ridges, the 

 larger ones more or less tuberculate, and both crossing somewhat 

 distant pinched up longitudinal ribs; greyish, between the ribs with 

 chestnut or chocolate dots and lines more or less confluent, interior 

 sometimes white, sometimes chocolate-lined on the spiral ridges. 

 Length, 1-1*5 in. 



Mauritius, Philippines Central Polynesia. 



It is C. echinatum, Kiener, C. Menkei, Desh. (fig: 19), from J. of 

 Bourbon. 



Var. SCABRIDUM, Reeve (not Phil.). Fig, 20. 



Smaller, stria3 scabrous, canal shorter and more open. 



Red Sea. 

 C. CITRINUM, Sowb. PL 20, figs. 21-23. 



Solid, spirally striated, with distant, large, rounded longitudinal 

 plaits, last whorl with a single varix, rounded below, canal long and 

 curved ; whitish, clouded with citron color. Length, 1*5 in. 



Philippines. 



I think that C. siphonatum, Sowb. (fig. 23), will prove synonym- 

 ous ; C. bicolor, Hombr. et Jacq. (fig. 22), also appears to be iden- 

 tical, or at least only a variety ; finally the whole are probably 

 mere varieties of C. columna. 



C. SUTURALE, Phil. PL 20, fig. 24. 



Longitudinally nodulosely ribbed, crossed by spiral lines, outer lip 

 crenulated ; whitish, with a chocolate sutural band. Length, 1 in. 



Philippines. 

 C. ECHINATUM, Lam. PL 20, figs. 25-27. 



Covered by revolving riblets, some of them bearing strong, pointed 

 series of nodules, others alternately larger and smaller and unarmed, 



