6 PROCEEDINGS OF THE ACADEMY OF [Jan., 



2500 ft., without dark markings, which seems to be an albino muta- 

 tion of pittieri, parallel to the mutation concolor of eastern Mexico 

 rather than directly referable to that form.^ Von Martens has 

 noted that in the State of Vera Cruz ''the white variety [mut. con- 

 color] has been found with typically colored specimens" of D. at- 

 tenuatus. 



"Dijm&exis josephus (Angas). 



A shell of the uniform white mutation was taken at Guapiles by 

 D. E. Harrower. 



SUCCINEID^. 

 Succinea recisa Morelet. 



Juan Vinas, nearer waterfall, 3300 ft. 



Succinea guatemalensis Morelet. 



Rio Reventazon, foot of waterfall near bridge, below Juan Vinas; 

 also at 2500 ft. on petiole of "Hoja de Pato";« near Cachi, 3450 ft. 



PHYSIDiE. 

 Aplexa fuliginea (Morelet). 



S. Isidro del Tejar, 4500 ft. 



Aplexa spiculata guatemalensis Fischer & Crosse. 



Ditch at the south end of Cartago and other places about the 

 city, 4750 ft.; Rio Zapote at confluence with Rio Reventazon, Cachi, 

 3450 ft. 



PLANORBIDiE. 

 Planorbis tenuis Phil. 



Rio de la Canas north of Santa Cruz. Guanacaste. abundant.'' 

 150 ft. 



Planorbis caribaeus Orb. 



East of Cartago and four miles southwest of the same place; S. 

 Isidro del Tejar, 4500 ft. 



Planorbis hondurasensis Clessin. 



Ditch along the road from San Jose to La Verbena, 3800 ft. 



' Cf. BioUey, Moll. terr. y fluv. de la meseta central de Costa Rica, 1897, 

 p. 13. 



^"An Aroid plant with gigantic arrow- or heart-shaped leaves and strong, 

 partly recumbent stems three to six inches thick." A Year of Costa Rican 

 Natural History, pp. 167, 334. 



^A Year of Costa Rican Natural History, p. 469. 



