CERITHIUM. 125 



C. FILOSUM, Sowb. PL 21, fig. 35. 



Longitudinally plicate, with three spiral rows of rather large 

 rounded tubercles, and an intermediate smaller row, interstices 

 narrow ; white, with chestnut lines between the ribs. Length, 22 

 mill. 



Philippines. 

 C. CORALLINUM, Dufresne. PI. 21, fig. 36 ; PL 24, fig. 46. 



Shell with strong, rounded longitudinal ribs, crossed by spiral 

 riblets and intermediate striae, the intersections tuberculated, aper- 

 ture crenulated within ; chocolate brown. Length, 40 mill. 



Philippines, 

 C. SCULPTUM, Pease. PL 21, fig. 37. 



Shell spirally, nodulosely ridged, obsoletely longitudinally ribbed, 

 regularly and evenly engraved throughout with close-set lines; 

 whorls flatly convex ; canal rather long and oblique ; white, apex 

 tinged with violet. Length, 1'25 in. 



Paumotus Is.; Tali it i. 



I am inclined to consider this identical with, and a synonym of 

 Vertagus torulo*u#, Linn., but retain it here on account of some lin- 

 gering doubts about it. 

 C. VULGATUM, Brug. PL 21, figs. 38-47. 



Shell with distant, spiral, nodulose ribs, one row of nodules on 

 each whorl more prominent, between the ribs are fine, close, en- 

 graved striae ; color variegated with grey, and chocolate or chestnut 

 in undulating strigations and spots, interior similarly colored, the 

 lips often tinged with orange brown. Length, 1-3 in. 

 Southern Europe, West Africa, Cape of Good Hope (Challenger 



Exped.). 



The synonymy, including varietal names is enormous. I do not 

 think the species varies more than is usual in the genus, and I am 

 not disposed to recognize the so-called varieties as having any real 

 claim to separation from the type ; however, as they are admitted by 

 some European naturalists of the " modern school " I figure a num- 

 ber of them. 



Locard identifies this species with Strombns tubercufafas, Linn. ; 

 to this may be added, among other names C. subnodosum, Adams 

 (fig. 39), from a worn and somewhat aberrant form, C. Moluocan/us, 

 Renieri, C. alucoides, Olivi, C. Goumier, Adanson, C. nerinaceus, 

 Renieri, C. Milne-Eckvardsii, Calcara. C. modosus, Schroter, C. 

 <i/nr<>, Murschlius, and the following "varieties" : 



