622 



PROCEEDINGS OF THE ACADEMY OF 



[Dec, 



Species and Subspecies. 



Planorbis cimex Moric 



" cultratus Orb 



" depressissirnus Moric 



" guadeloupensis Sby 



" peregrinus Orb 



" stramineus Dkr 



Plekocheilus piyiiadinus Orb 



Prisodon obliquus Schum 



" syrrnatophorus Meusch 



Psadara derbyi cearana n. subsp 



SegiiK nfiiKi pn/xiri/oisis n. sp 



Sohiriipsis najiU m I_)ohrn 



Sin/itd.ri'^ (ihinui(n.'<i.s n. sp 



comboidt'8 Icevigata Orb 



" cookeana n. sp 



" deformis Fer 



" deplanchei Drouet 



" " quixadaensis n. sp. 



'■ subregularis Pfr 



Strobilops brasiliana n. sp 



Strophocheilus cantagallanus Rang 



" maximus Sby 



" oblongus Miiller 



Succinea pusilla Pfr 



Suliulina otinna Rrus 



Syxtrnj,.hiii nilnn, n. sp 



Thysiinojihord cam (iuppy 



Tomigerus clausus Spix 



'' loevis Ihering 



" pilsbryi n. sp 



rochai Ihering 



Zonitoides parana n. sp 



Totals in each (district. 



49 



52 



34 



Page. 



661 

 662 

 662 

 661 

 662 

 662 

 635 

 665 

 665 

 634 

 662 

 633 

 629 

 627 

 628 

 627 

 628 

 628 

 627 

 647 

 634 

 634 

 634 

 647 

 644 

 631 

 632 

 642 

 642 

 643 

 642 

 632 



It will be seen, therefore, that 49 species and subspecies were taken 

 in the first district, 52 in the second, and 34 in the third. The fol- 

 lowing statements show the districts in which representatives of 

 the various genera were taken. 



Twelve genera represented in the first district only: Anostoriia, 

 Bifidaria, Ccecilioides, Eupera, Idiopyrgiis, Littoridina, Odontostomus, 

 Psadara, Segmentina, Succinea, Thysanophora, Tomigerus. 



Eight genera represented in the second district only: Diplodon, 

 Doryssa, Gundlachia, Hemisinus, Marisa, Prisodon, Strobilops, 

 Zonitoides. 



Seven genera represented in the third district only: Drymceus, 

 Entodina, Guppya, OrthaUcus, Plekocheilus, Solaropsis, dystrophia. 



Five genera represented in all three districts: Ampullaria, 

 Bidimidus, Opeas, Strophocheilus, Suhulina. 



