144 CERITHIUM. 



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

 33), is certainly a synonym. 

 C. PIPERITUM, Sowb. PI. 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. PI. 26, fig. 17. 



Rather 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.) 



Unfigwed 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. Bonin Is. 



C. MINUTUM, Nuttall. Sandwich Is 



C. ALABASTRUM, Morch. St. Thomas, W. I. 



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



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 



Dunker. 



C. DORSUOSUM, Menke. Australian 



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. 



