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TERTIARY FAUNA OF FLORIDA J 



Poromya jamaicensis n. sp. 



PLATE 56, FIGURE 23. 



Oligocene marls of Bowden, Jamaica; Henderson and Simpson. 

 Shell small ; hinge, interior, and surface sculpture like those of P. granu- 

 lata Nyst, but differing from it by the absence of rostration at the posterior end, 

 which is evenly rounded though more attenuated than the anterior end. Length 

 5.5, height 4.7, diameter 3.0 mm. 



All the specimens found agree in small size, absence of rostration, and 

 closeness of the granular surface sculpture, which is disposed in radial lines. 



P. granulata has not yet been found in the Pliocene, but is not rare, living 

 in the deeper waters off the coast. Adults average about ten millimetres in 

 length. 



FAMILY VERTICORDIIDyE. 



Genus VEBTICORDIA Wood. 



Verticordia (Wood MS.) Sowerby, Min. Conch., vii., p. 67, pi. ocxxxix., 1844. 

 Verticordia (Wood MS.?) Gray, Synopsis Brit. Mus., 1842; nude name. 

 Hippagus Philippi, Moll. Sicilian, ii., p. 42, 1844; Sowerby, Min. Conch., vii., p. 67, 1844; 



not of Lea, 1833. 



Cryptodon (sp.) Wood, Ann. Mag. Nat. Hist., vi., p. 247, 1840; not of Turton, 1822. 

 Iphigenia O. G. Costa, Paleont. Regn. Napoli, p. 160, 1850; not of Schumacher, 1817. 

 Verticordia Seguenza, Journ. de Conchyl., viii., p. 286, 1860; Fischer, op. cit., p. 295, 



1860; Seguenza, Rendiconte R. Accad. delle Sci., p. 5, 1876; Dall, Bull. Mus. Comp. 



Zool., ix., p. 105, 1881 ; xii., p. 285, 1886. 

 Hippella Morch, Malak. Blatt., vii., pp. 199-200, 1861. Type H. hippagus Morch. 



This group was fully discussed by me in the paper above cited, and to this 

 the reader is referred for details. The sub-groups and their types comprised 

 in this family are as follows : 



Subgenus Verticordia s. s. Type Cryptodon verticordia Searles Wood, + Hip- 

 pagus cardiiformis Sowerby. 

 Subgenus Trigonulina Orbigny, 1845. Type T. ornata Orbigny, 1845. 



Trigoniluna Chenu, 1862, Hippella Morch, 1861, and Hippagus (sp.) Adams 

 and Reeve are synonymous. 



Subgenus Haliris Dall, 1886. Type Verticordia Fischeriana Dall. 

 Genus Pecchiolia Meneghini, 1851. Type P. argentea Mariti. Miocene. 

 Genus Euciroa Dall, 1881. Type E. ele gantissima Dall. 



For a full description of this remarkable type see Proc. U. S. Nat. Mus., 

 xvii., No. 1032, pp. 687-697, 1895. 



