48 THE NAUTILUS. 



They burrowed somewhat like a mole, and often the little mole- 

 like ridge could be followed quite a distance, and the mollusk 

 found working under cover. 



It is a viviparous genus. When cleaning these shells the 

 embryos run from one to three to the individual. None were 

 noticed with more than three. 



Planorbis caloderma Pilsbry. Only three specimens taken in 

 the net with the small forms. 



Planorbis caribaeus (Orb). One small specimen with the 

 above. 



Ancylus sp. Taken in the net. 



Euglandina decussata (Desh.). All dead but one. 



Euglandina monilifera (Pfr. ). One alive, found in the banana 

 field under dead leaves. 



Salasiella guatemalensis Pilsbry. Under leaves and trash. 



Guppya elegantula Pilsbry. Lake drift. 



Guppya gundlachi Pfr. Lake drift. 



Zonitoides minusculus (Binney). Lake drift. 



Averellia hinkleyi Pilsbry. 



Thysanophora plagioptycha (Shutt. ). Lake drift. 



Strobilops strebeli guatemalensiiS n. subsp. 



Bulimulus corneus (Sowb. ). Found in a banana field under 

 dead leaves. 



Drymaeus sulphureus (Pfr.). Bones. 



Oxystyla princeps (Brod). Dead. 



Opeas beckianum (Pfr.). Lake drift. 



Opeas micro. (Orb. ). Lake drift. 



Opeas pumilum (Pfr.). Lake drift. 



Subulina octona (Chem.). 



Leptinaria guatemalensis C. & F. Lake drift. 



Leptinaria livingstonensis Hinkley. In the fields back of 

 Jocolo. 



Caecilioides consobrina veracruzensis (C. & F. ). Lake drift. 



Gastrocopta pentodon (Say). Lake drift. 



Succinea recisa Morelet. Banana fields. 



Aperostoma dysoni (Pfr.). Under decaying leaves in the 

 banana fields. 



Amphicydotus bmnuatus (Martens). Scarce. 



