190 PROCEEDINGS OF THE ACADEMY OF [Feb., 



radially striate; pallial sinus extending nearly to the middle of the 

 shell's length ; the margin finely crenate. 



Length 15.5, all. 6, diam 4.5 mm. 



Found by Mr. J. G. Malone in ballast from South Africa. 



Types are No. 79,532, Coll. Acad. Nat. Sci. Phila. 



This species is somewhat allied to D. Oweni Gray, but the beaks 

 are nearer the posterior end, the valves are not keeled ; the poste- 

 rior costulation extends further, and between and upon the riblets 

 fine radial striae are conspicuous ; finally, the basal margin is finely 

 and strongly crenulated inside and the shell is smaller. 



It is named in honor of M. Victor Bertin, whose excellent 

 Revision des Donacidees (1881) and various other papers on 

 bivalves give evidence of a well -trained and acute mind, unfor- 

 tunately lost to science by death at the beginning of a useful 

 career. 



The following species of Donax occurred with D. Bertini : D. 

 Madagascariensis Wood, D. bipartitus Sowb., D. spiculum Rve., D. 

 Erythrceensis Bertin. 



Fossams capensis n. sp. PI. V, fig. 13. 



Shell perforate, turbinate, white, the last whorl encircled by 

 three very strong, compressed, flange-like keels, the largest peri- 

 pheral in position, the smallest surrounding the columellar region, 

 another of intermediate dze between these two. Surface irregu- 

 larly striatulate, with some lamellar riblets toward the aperture; 

 densely spirally striate, especially between the keels. Spire acute; 

 whorls about 6, the last three showing the peripheral keel above 

 the sutures. Aperture semicircular, the peristome continuous, 

 notched at the terminations of the keels. 



Alt. 6, diam. 4 mm. 



In ballast from South Africa. 



Type in Coll. Acad. Nat. Sci. Phila., No. 79,820. 



The spire is more elevated than in F. ambiguus (L.) or F. 

 pusillus (Gld.). 



