- 21Í) — 



receberão os seus Unionidos do Norte e em parte formão 

 uma província natural com a America central. Será sií 

 mais tarde possível occupar se mais exactamente com 

 estas questões, quando conhecemos Unionidos fosseis 

 dos Estados pacíficos e da Califórnia. O que já hoje po- 

 demos dizer, é que as montanhas rochosas formam uma 

 divisa zoogeographíca muito mais importante do que 

 a serra dos AUee-hanies. 



Summary 



Having received by Mr. Berlin Hart Wri ht many 

 species of Unionides from Florida, and being- the matter 

 well studied by him and by Charles T. Simpson, I have 

 pusblished here the results of my respective study, 

 indicating by an asterisk the species represented in my 

 collection, and hoping to receive by the time the others 

 species, Avhich in great part seem duvidous to me. 



The list of species and of the geographical distri- 

 buition is given. Florida has some species not recog- 

 nized today in Georgia etc. (U. Anthonyi, coruscus, Cun- 

 ninghami, Waltoni, subluridus, monroensis, Websteri- 

 succissus\ but these may be recognized as identical to 

 others and may be found also in other states. The only 

 singular type is U. infucatus, a living tertiary fossil, 

 extinguished in others regions of North America. 



The Florida fauna therefore is not at all a caracte- 

 s ic one, but a depauperated one, related with the 

 Missisippi fauna. Unio parvus seems not to be represented 

 in Florida, but substituted by U. amyg-dalum. U. minor 

 Lea is represented. I can not accept the synonymy of 

 E. Call in this point. U. minor is a good species from 

 which I', paulus Lea not differ, and allied to U. glans 

 Lea., of which marginis Lea is synonymic. Not being 

 disposed to accept the combination of parvus and minor, 

 on the other hand I cannot understand how Simpson se- 



