53 



48. — Blank spaces lunate all round area. Inter-radials smooth. 



C. undulatus* < ire v. 



49. A distinct head at point of intersection of each ray and stria. 



C. Campeacheanus, Deby. 



50. — No beads or knots at intersection of rays and striae. 



C . crebrecosta tus,\ Grev. 



Group II.— THE VAGiE. 



1. — No distinct marginal Rays. C. echeneis, Ehr. 



2. — Marginal Rays distinct (3). 



3 — Inter-Radials, with 3 distinct rows of puncta. Small forms. 



C. cocconeiformisX Cleve. 



4. — No Inter-Radial dots. Large forms. C. dypeus, Ehr. 



* I include in this species C. Greenleafiamis, Grun., C. erosits, Castr. , 

 and C. oceanus, Castr. 



t This comprises asvars. or synonyms C. singularis, A. S., C. intermedins. 

 Grun., C. crebrestriattiSy Grun.,C. Heufleurii^ Grun., and possibly C. humiiis, 

 Castr., the drawing of this last bejng too bad for safe identification. Several 

 other forms seen I consider as varieties, one remarkable one among them from 

 Campeche Bay and from the Comoro Islands, in the collection of Mr. Kinker, 

 has the stria? distinctly punctate under a high power. I propose calling this 

 form var. Kinkerianus. — D. 



X Prof. Cleve gives Labuan, Borneo, as the locality for his species. I have 

 .seen it from Ning-po and from Elephant Point. The valves being nearly flat, 

 and the long-oval shape seems to exclude it from the genus Campy lodiscus^ few 

 of the characters of which it seems to possess. 



