THE NAUTILUS. 



29 



Meretrix (Eutivela ) Iheringi Dall, n. s. 



Shell thinner, more equilateral and more elongate than E. per- 

 plexa, waxen-white with more or less interrupted rays of brown ex- 

 tending from the beaks toward the margin, modiBed by whitish zig- 

 zags. The exterior is smooth, with a well marked epidermis and 

 faint, obscure radiationscorresponding to the interior marginal cren- 



ulatious. The interior of the 

 beaks and the cardinal re- 

 gion on both sides of them 

 below the margin more or 

 less marked with purplish 

 brown. The lunule is nar- 

 row lanceolate and faintly 

 impressed. The figure illus- 

 trates the characters of the- 



Eutivela Iheringi Dall. siuglc Valve UpOU which the 



species is founded, which measures 41 mm. long, 27 high, while 

 the double diameter would be about 18 mm. 



It is named in honor of Dr. H. von Ihering, from whom it was 

 received, and by whom it was collected on the beach near Santa 

 Caterina in southeastern Bi-azil in about latitude 26° south. 



DESCRIPTIONS OF TWO NEW SPECIES OF UNIO FROM FLORIDA. 



BY WILLIAM A. MARSH. 



Unio Singleyanus. 



Shell smooth, oval, slightly depressed, inequilateral ; valves rather 

 thick, squarish before, rounded behind ; beaks small and flat ; 

 epidermis yellowish-brown, shining, with or without rays, usually 

 rayless. Cardinal teeth crenulate, oblique, single in right valve, 

 double in left. Lateral teeth short and straight ; anterior cicatrices 

 small, deep, not confluent, posterior cicatrices confluent, slightly im- 

 pressed ; nacre white, iridescent. 



Habitat. A small creek near Pilatka, Florida. 



Remarks. Seven shells of this species were sent to me by T. L. 

 Cunningham a number of years ago. This species belongs to the 

 jKirvus group, but differs very much from any other member of that 

 group in the yellowish color of its epidermis, in its peculiar outline 

 and much flattened form of the females. Some specimens are cov- 



