144 CERITHIUM. 



C. pusillum, Nuttall, is probably, and C. papillosum, Sowb. (fig, 

 33), is certainly a synonym. 

 C. PIPERITUM, Sowb. PL 27, figs. 31, 32. 



Spirally ribbed and grooved, white, the ribs chestnut spotted, 

 whorls angulated in the middle. Length, 18- mill. 



Philippines ; Polynesia. 



C. punctatum, Brug., and C. alveolus, Hombr. et Jacq. (fig. 32), 

 are synonyms. 



Subgenus STILUS, Jeffreys, 1885. 

 C. INSIGNIS, Jeffreys. PL 26, fig. 17. - 



Kather thick, glossy, with numerous longitudinal ribs, crossed by 

 three spiral striae on each whorl, the intersections tubercular, peri- 

 phery of body whorl ridged, base smooth and somewhat concave, 

 white. Length, 6 mill. 



Atlantic 0. (Porcupine Exped.) 



Unfigured and Undetermined Species of Cerithium. 



The following are all described under the generic name of Ceri- 

 thium, and are accordingly included here, although it is probable 

 that some of them belong to other groups in the family. 

 C. STIGMOSUM, Gould. Boiiin Is. 



C. MINUTUM, Nuttall. Sandwich Is 



C. ALABASTRUM, Morch. St. TJwmas, W. L 



C. RAWSONI, Krebs. Morch. Barbados, W. L 



C. EPESCOPALE, C. ELONGATUM, C. FULVUM, C. FRAGILE, C. GRANU- 

 LOSUM, C. GRACILE, C. IRREGULARE, C. MUREX, C. PAGODULA, 

 C. PLATYNOTUM, C. PICTUM, C. RUBROPUNCTATUM, C. RUDE, C. 

 CONICUM, C. CONULUS, C. VENTRICOSUM, C. TURRITELLA, all of 



Anton. Local, unknown. 



C. SCABRICOSTA (Loc. unknown), C. TUBULUS (Bass Sts.), C. FUS- 



CUM (Navigator's Is.), C. GIBBEROSUM (Nicobar Is.), all of 



D linker. 



C. DORSUOSUM, Menke. Australia, 



C. VERSICOLOR and C. PUMILUM (Hob. unknown), C. GLABRATUM 



(Australia), C. FILOSUM (California), C. SPADICEUM (Yucatan)? 



C. EXIGUUM (Friendly Is.), C. CECILLII and C. NEBULOSUM 



(Loochoo Is.), C. ANTARCTICUM and C. PULLUM (Magellan's Sts.), 



all of Philippi. 



