THE NAUTILUS. 55 



SHELL COLLECTING ON THE MOSQUITO COAST OF NICAEAGUA.-IV. 



BY W. II. FLUCK. 



Strombus bituberculatus Lam. Man of War Keys. Common. 



Oypraea exanthema L. Same locality. A common shell on all 

 the keys, including Great and Little Corn Island. 



Dolium perdix L. Same locality. 



Pyrula papyratia Say. Four dead shells on the beach near the 

 mouth of the Wawa river. 



Polinices brunnea Link. Wounta Haulover. Abundant. 



Polinices lactea Guilding. Man of War Keys. Plentiful. 



Natica maroccana Dillw. Wounta Haulover. Abundant. 



Crepidula plana Say. Beach, north of Wawa river. One speci- 

 men. 



Grepidula convexa Say. Beach, Wounta Haulover. Abundant. 



Janthina sp ? Although I tramped the beach nearly every even- 

 ing for four years I found but two of these shells, but they were per- 

 fect, living specimens. 



Vermicularia spirata Phil. Walpa Siksa. One shell. 



Litorina lineata Phil. On the rock at Walpa Siksa. Plentiful in 

 the dry season when no fresh water from the river entering the sea 

 near the rocks disturbs them. Shells rather small, carinate and dis- 

 tinctly marked with the characteristic zigzag lines. I also have ten 

 specimens from the Man of War Keys which are larger, less carinate 

 and not so distinctly marked. 



Litorina columellaris D'Orb. Wounta Haulover and everywhere 

 on the beach along the whole coast. Invariably attached to stranded 

 logs and pieces of wreckage. It often hollows out a pocket for itself 

 in the decaying wood. This is the commonest litorine on the whole 

 coast of Nicaragua. 



Litorina angulifera Lam. This large and beautiful litorine is 

 found along all the lagoons and rivers, hanging to mangroves be- 

 neath the surface of the water or not many feet above it. Speci- 

 mens from Karata and Wounta. I never found it along the sea nor 

 in fresh water up the rivers. It seems to prefer the brackish water 

 " inside " not far from the sea. Very abundant. 



Tectarius muricatus L. Man of War Keys. Plentiful. 



Cerithium literatum Born. King's Keys. Abundant. 



