42 THE NAUTILUS. 



Strigilla flexuosa (Say). Much like S. pisiformis; has not 

 the red coloring of that species. 



Macoma constrict a (Brug.). 



Donax striata (Linn.). 



Donax striata mediamericana (Pilsbry). A small form of 

 striata. Dead shells were more numerous than the live ones, 

 or so appeared. 



Tivela mactroides (Born). The most common species on 

 the beach ; no live ones seen and both valves together were 

 very scarce. 



Cyrena solida Phil. Plentiful in Rio Dulce, most mature 

 ones badly eroded. 



Cyrenoidea guatemalensis Pilsbry. In 1914 one specimen 

 taken near the mouth of Cavech river. 



Mytilus exustus (Linn.). In masses on rocks and drift 

 logs and under the bluff of the projecting point of land, 

 mostly immature. 



Mytilopsis sallei (Recluz). Often with M. exustus. 



ACROSS THE Rio DULCE FROM LIVINGSTON, on the first moun . 

 tain or foothill, is Rio Blanco, a small stream in which were 

 found : 



Nephronaias calamitarum (Morelet). 



Pachycheilus pyramidalis (Morelet). Mostly immature. 



Pachycheilus indiorum (Morelet). 



Pachycheilus corvinus (Morelet) and the color variety 

 lutescens C. & F. 



Helicina rostrata Morelet. On top of the hill one broken, 

 nearly fresh specimen was found. The writer has three speci- 

 men received from Thomas Bland many years ago. 



A short distance west of Livingston were found : 



Aperostoma dysoni (Pfr.). 



Amphicyclotus bisinuatus (Martens). Dead specimens. 



Chondropoma rubicund-urn (Morelet). Scarce. 



Subulina octona (Chem.). Very plentiful by the side of 

 side streets and paths among decaying vegetation and filth; 

 also found on the hillside in front of the hotel, with Lepti- 

 naria livingstonensis. 



Oxystyla princeps (Brod.). Bones only. 



