1897.] NATURAL SCIENCES OF PHILADELPHIA. 295 



the lower part of the valves less coarse. I know of no other Cor- 

 bula at all similar to this remarkable species. 



At Dr. Rush's suggestion, this fine species is named in honor of 

 Commander H. L. Lyon of U. S. S. " Yantic." 



Corbula Iheringiana n. sp. PI. VII, figs. 24, 25, 26. 



Shell very inequivalve and very inequilateral ; moderately con- 

 vex, somewhat Donax like in general form. Whitish under a dull, 

 light brown cuticle. Right valve much the larger and more con- 

 vex, projecting beyond the other above, the posterior three-fourths 

 of the sinuous basal margin conspicuously surpassing the left valve. 

 The upper margin is sloping and conspicuously concave posterior to 

 the beaks, the posterior end truncated ; basal margin moderately or 

 slightly arcuate; anterior end obliquely truncated in front of the 

 beaks, becoming rounded below. Surface rather irregularly wrin- 

 kled-striate, sometimes (as in the specimen figured) with some rather 

 coarse folds on the smaller valve. 



Length 9, breadth 5'5, diam. 3"8 mm. 



Maldonado Bay, Uruguay, in 3 to 6 fathoms. 



This is a species of peculiar contour, the valves of very unequal 

 size and dissimilar shape, even for this genus. I have been able to 

 find among the numerous forms described from the Antillean region, 

 none much resembling this. 



The specific name is intended to honor the only working malacol- 

 ogist in South America to-day. Naturalists may well congratulate 

 themselves that the learned and virile Director of the Museu Paul- 

 ista is adding to laurels fairly earned in the Fatherland, another 

 and American wreath, by his enlightened labors upon the South 

 American fauna. 



Crassatella (Eriphyla) Maldonadoensis n. sp. 



Smaller than E. lunulata Conrad, decidedly longer in proportion 

 to the height, the anterior dorsal slope somewhat convex instead of 

 straight, and far shorter than the posterior slope, while in E. lunu- 

 lata it is straight, concave near the beaks, and longer than the other 

 slope. The lunule is more deeply excavated, and the posterior end 

 of the shell rounded, not subangular ; beaks less elevated, less acute, 

 directed forward more than in E. lunulata. Exterior white, 

 variously suffused, maculated or interruptedly rayed with pink ; 

 having low and inconspicuous, but coarse concentric wrinkles. In- 

 terior pink in the cavity of the valves, white below the pallial line. 



