THE NAUTILUS. 



Vol. XXXIV OCTOBER, 1920. No. 2 



GUATEMALA MOLLUSCA. 



BY A. A. HINKLEY. 



This list is the result of three vacation trips. For the de- 

 terminations I ana indebted to Dr. H. A. Pilsbry, Dr. Bryant 

 Walker, Dr. V. Sterki, Dr. Win. H. Dall and others of the 

 National Museum and Prof. F. C. Baker of the Illinois Uni- 

 versity. 



For accommodations and personal comfort much is due to 

 the kindness of Mr. Landry, Supt. of the United Fruit Com- 

 panies' plantations at Quirigua. To Mrs. Lucie Potts, Pro- 

 prietress of the Jocolo plantation. To Mr. and Mrs. Robert 

 Hempstead of the Chejel and Chama coffee plantations and 

 to others for their various acts of kindness. The list is ar- 

 ranged by localities. 



LAKE AMATITLAN is some 20 miles south of Guatemala 

 City ; it is two lakes connected by a short strait across which 

 the railroad embankment has been built. Laguna Station is 

 on the south or southwest of the lake, just across the strait. 



Pachycheilus lacustris (Morelet) is plentiful in the shallow 

 water of the lake. The largest were found among rushes 

 some 40 feet from a hot spring. Egg masses of this mollusk 

 were numerous, much like those of Physa but larger. The 

 fresh masses were clear, changing to yellowish as the young 

 were about to emerge. Some were seen breaking through. 



Amnicola guatemalensis Walker. Taken near the edge of 

 the water or on driftwood and pumice. Another species of 

 Amnicola was taken with the above. 



