THE NAUTILUS. 41 



Helicina sp. More depressed than any other Helicina 

 found except H. amocna. 



Lucidclla lirata (Pfr.). 



Truncatella sp. Two specimens. 



Cochliopa minor Pilsbry. 



Spirilla spirilla (Linn.). Plentiful in 1914, scarce in 1917. 



Thais coronata var. On rocks beyond Cavech village and 

 on piling and breakwater at Puerto Barrios. 



Melongena melongena (Linn.). In shallow water. Donax 

 seemed a favorite food for this mollusk. 



S trombus pugilis (Linn.). A few dead ones near Cavech 

 village. 



Epitonium lineatum (Say). One small specimen. 



Ccccum sp. One specimen. 



Littorina nebulosa Lam. On rocks and drift logs ; common. 



Littorina carinata Orb. Young were very numerous on a 

 perpendicular rock; many were beyond reach of the spray 

 from the ordinary waves. 



Litiopa melanostoma (Rang). 



Nerita fulgurata (Gmel.). Beyond Cavech village, on rocks 

 out of the water at low tide. 



Neritina, punctulata Lam. In Cavech river on rocks near 

 the limit of high tide. Often these shells were nearly covered 

 with small oval cases (of an insect?). 



Neritina listeri Pfr. Close to N. virginea, only larger. 



Neritina virginea (Linn.). Numerous on the muddy banks 

 of Cavech river, covered with water at high tide, very plen- 

 tiful on the pebbly beach of Rio Dulce. 



Neritina lineata reticulata (C. & F.). In thick swampy 

 woods near the beach. 



Ncritilia succinea guatemalensis (Pilsbry). Just above 

 high tide in a clear pool of Cavech river; with them were a 

 few young N. virginea. 



Cylichnella bidentata (Say). Two specimens. 



Haminea solitaria (Say). One specimen. 



Tagelus poeyi Dall. 



Mulinia guadelupensis (Reel.). 



Strigilla pisiformis (Linn). Common on the beach, but 

 both valves together were scarce. 



