4 THE NAUTILUS. 



especially about the sand-bars and in the coves at and near the mouth 

 of rivers, as at Wawa, Wounta, and Wai pa Siksa. 



Pecten dislocatus Say. Wounta Haulover. A few single valves. 



Plicatula ramosa Lam. Wounta Haulover. Found attached to 

 soft corals, sponges, and like marine, growth. Numerous. 



Ostrea virginica Gmel. A very abundant shell in all the lagoons 

 and estuaries, not far from the sea. It seems to multiply very fast, 

 filling up harbors and channels. It does not get as large as our 

 northern oysters, possibly on account of the large quantities of fresh 

 water that cover them for protracted periods during the rainy season. 



Discinisca antitlarum D'Orb. Wounta Haulover. I found six or 

 eight on an old Pinna. These little brachiopods remind one of 

 miniature Anomia simplex. 



Helicina amoena Pfr. In native clearings in the forest along the 

 Wounta (or Kukallaya) river, northwest of the village of Kukallaya. 



Helicina dalli Bartsch. Near Wani, Nicaragua. 



Nephronaias flucki Bartsch. From the Wounta river, a day's 

 paddling by canoe to the northwest of the village of Kukallaya. 



Streptostyla ftucki Bartsch. Near Wani. 



Neocyclotus ^Neocyclotus) chrysacme Bartsch. Near Wani. 



Chrondropoma callipeplum Bartsch. Near Wani. 



The region about Wani is quite different from the low, sandy, 

 coastal-plain. It takes many days' canoe paddling, according to the 

 volume of water in the river, to reach it. It is in what the Indians 

 call the " hill country." 



The five last-named shells are new. Dr. Paul Bartsch, who has 

 seen my entire collection, is at this writing publishing descriptions of 

 them. 



I have a few more Mosquito Coast shells which I might add to 

 this list, but will not do so now. At some future time I shall ask for 

 space for another article. 



I am convinced that the shells I collected in the lowlands of east- 

 ern Nicaragua do not by any means exhaust the molluscan fauna of 

 that region. The highlands of the interior, the mangrove swamps, 

 rivers, lagoons, sea beaches, and the keys, all have treasures for the 

 man who has time to search for them. As for myself, I picked up 

 only such shells as I stumbled over in the strenuous pursuit of other 

 duties. 



