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I4SQ 



TERTIARY FAUNA OF FLORIDA 



This group is confined to the tropics and is known from North Africa, 

 South America, the West 'Indies, Florida, Mexico, Yucatan, Central America, 

 and Panama. The nepionic shell is visible, but not conspicuous in most cases, 

 and feebly differentiated from the disk. The animal has two siphons (E. 

 cubensis), is viviparous, and has the habits of Sphcurium, which it mainly re- 

 places in the tropics, though I have a typical Spharium from Uruguay and 

 another from Costa Rica. The shells of this group are subject to the attacks 

 of ar parasitic infusorian (?) of a blackish color which attaches itself to the 

 inner surface of the valve and is often overlaid by a layer of shell secreted by 

 the irritated surface of the mantle, so as to appear like color markings due to 

 the mollusk itself; but, when fresh, these black specks can be easily removed 

 on the point of a pin and are of a fleshy consistency. 



Genus CORNEOOYCLAS (Ferussac). 

 Cornebcyclas {ex parte) Ferussac, Diet. Sci. Nat, xii., p. 278, 1818 (Pisidium pusillum 



Gmelin, P. virginicum Gmelin, and P. amnicum Miiller). 

 <^Phymesoda Rafinesque, Ann. Gen. >des Sci. Phys., Bruxelles, 1820, p. 319, Sphcerium 



ovale Ferussac and Pisidium virginicum Gmelin. 



Phymeroda Rafinesque, op. cit., p. 319, err. typ. pro Phymesoda Rafinesque. 

 Pisidium C. Pfeiffer, Naturg. Conch., i., p. 123, 1821 ; P. amnicum Miiller (as obliquum 



Pfr.), P. obtusale Pfr., and C. fontinale Pfr. 

 Pera Jenyns (in syn. as of Leach MS.), Mon. Cyclas and Pisidium, Cambridge Phil. 



Trans., 1832, p. 13 ; = Pisidium C. Pfeiffer. 

 Pisidium Schlueter, Verz. Conch., p. 34, 1838; Gray, Man. Land and Freshw. Sh. Brit. 



Ids., p. 264, 1857; Prime, Mon. Am. Corbiculadce, p. 59, 1865; Westerlund, Fauna 



Palsearct. reg., vii., p. 18, 1890. 

 Galileja O. G. Costa, Corris. Zobl., i., 1839, Me Philippi, Moll. Sicil, ii., p. 214, 1844, G. 



tenebrosa Costa, = Pisidium pulchellum Jenyns. 

 Pera Gray, Turton, Man. Land and Freshw. Sh. Brit. Ids., 2d ed., p. 282, 1840; ibid., 



3d ed., p. 264, 1857; P. Z. S., 1847, p. 185, Pisidium amnicum Miiller; Bourguignat, 



Rev. et Mag. de Zool., 2me Ser., vi., pp. 84, 675, 1854. 

 Euglesia (Leach) Gray, Turton, Man. Land and Freshw. Sh. Brit. Ids., 2d ed., p. 



282, 1840; ibid., 3d ed., p. 264, 1857; P. Z. S., 1847, P- 185, Pisidium amnicum 



Muller. 

 Cordula Leach, Synops. Moll. Gt. Brit., p. 292, 1852, sole ex. Pisidium amnicum Muller; 



Gray, Turton, Man. Land and Freshw. Sh. Brit. Ids., p. 268, 1857. 

 Pisum Gray, Ann. Mag. N. Hist., 2d Ser., xi., p. 39, Pisidium amnicum Muller; not 



Pisum Megerle, 1811, founded on a brachiopod fossil. 



Physemoda Prime, Mon. Am. Corbiculadce (in syn.), p. 62, 1865, = err. typ. pro Phyme- 

 soda Raf. 



