THE NAUTILUS. 3 



being sandy, the sea open with no bars, and the only rocks too far 

 out to be of any injury to their fragile spines. Wounta Haulover. 



Chione cancellata. A variety. Much worn odd valves only. 

 Wounta Haulover, on the beach. 



Cyrena (Polymesoda) panamensis Prime. This is the common 

 bivalve of all the lagoons along the Caribbean coast of Nicaragua. 

 It is not always found in the mud, although in the Bluefields lagoon 

 it thrives in that kind of a station. At Wounta Haulover it lives in 

 the lagoon back from fche sea, on a sandy bottom, while at Karata it 

 is to be found on the gravel. I have eaten very good chowder made 

 of klito, as the Indians call it. The umbones are always, so far as I 

 have observed, corroded in adult specimens. 



Tivela mactroides Born. This pretty little clam is quite common 

 on the shore and in the shallow water along the open sea. The shell 

 is solid and looks as though it might stand rougher water than it 

 usually gets on the Mosquito Coast. Dr. Dall, in his " Synopsis of 

 the Family Veneridae " is quite right in saying: " This species may 

 be white, or chestnut-brown or with brown rays on a lighter ground." 

 I have specimens that alternate with white and brown concentrically. 



Echinochama arcinella L. A few dead shells, with one exception 

 all left valves. 



Chama congreyata Conr. Dead shells everywhere on the beach, 

 especially left valves attached to old Pecten, Area or Chione shells. 



Codakia orbicularis L. Plentiful about Man of War Keys ; I 

 also have a few from Pearl Key. 



Area umbonata Lam. Man of War Keys. I found but one speci- 

 men, although the Indian turtle-hunters, who frequent the Keys, told 

 me that it was a very common shell at times. 



Scapharca ( Cunearca) incongrua, var. braziliana Lam. Wounta 

 Haulover. Plentiful at all times on the beach, generally with hinge 

 ligament perfect. Also found alive in the shallow water on quiet 

 days. 



Area (Argina) campechensis Dillwyn. Walpa Siksa, on the sea- 

 beach, both north and south of the river mouth. 



Area occidentalis Phil. Bilwi, just north of the Wawa river 

 mouth, on the open beach. 



Melina ephippium L. Man of War Keys. Abundant. 



Pinna muricata L. I never found a living shell, but good speci- 

 mens of dead ones were to be found at almost any time on the beach, 



