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TERTIARY FAUNA OF FLORIDA '^ 



This group is confined to the tropics and is known from Nortli 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 feebl)' differentiated from the disk. The animal has two siphons (£. 

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

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

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

 of a 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 CORNEOCYCLAS (F<irussac). 

 Corneocyclas {ex parte) Ferussac, Diet. Sci. Nat., xii., p. 278, 1818 (Pisidimn 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. 

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

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



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. Corbiculadee, p. 59. 1865 ; Westerlund, Fauna 



Palaearct. reg., vii., p. 18, 1890. 

 Galileja O. G. Costa, Corris. Zool., i., 1839, fide 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. 18s, 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 



Miiller. 

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



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 Miiller; not 



Pisum Megerle, 181 1, founded on a brachiopod fossil. 

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

 soda Raf. 



