CERITHIUM. 123 



. 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. 



Red Sea. 



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

 variety of C. nodulosum. The synonyms are C. striatum, Schroeter, 

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

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

 to C. omissum. 



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, 11*5 in. 



Mauritius, Philippines Central Polynesia. 



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

 Bourbon. 



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



Smaller, strise 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, 



