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TERTIARY FAUNA OF FLORIDA 



Channel Islands (Guernsey) Ion. 3.25, alt. 2.75, diam. 2.0 mm. 



Wales (Lanti vet) " 4.00, " 3.5, " 2.5 mm. 



Bermuda " 3.33, " 2.8, " 1.5 mm. 



Florida (Fort Worth inlet) " 3.25, " 3.0, " 2.0 mm. 



California (San Diego) " 4.60, " 4.0, " 3.0 mm. 



(Monterey) " 3.50, " 3.5, " 2.25 mm. 



Genus MYTiTJTA d'Orbigny and Re"cluz. 

 Myllita d'Orb. and Recluz, Journ. de Conchyl., i., p. 292, 1850. 

 Mylitta Kobelt, 111. Conchylienbuch, pi. 103, fig. n, 1878. 

 I'ytliina sp. Tenison Wood, Hutton. 

 Type M. Deshayesii Recluz (as Erycina, 1844); D'Orb. and Recluz, op. cit.,'p\. n, figs. 



12-14. 



Shell equivalve, solid, surface punctate or sagrinate with concentric, radial, 

 or divaricate sculpture; ligament external, obsolete, amphidetic; resilium 

 strong, internal, seated in a conspicuous sulcus below the lower posterior 

 lamina, the mesial portion with a calcareous coating; valves with a small 

 anterior and posterior dorsal gape, but closed ventrally; hinge with a single 

 left anterior and posterior lamina and a single left cardinal, right valve with 

 a cardinal and double anterior and posterior laminae, the cardinals often bifur- 

 cate ; mantle completely open below between the adductors and probably 

 covering more or less of the exterior of the valves ; pallial line simple, with 

 large adductor scars; foot strong with a conspicuous (byssal?) sulcus, the 

 young incubated in the generative or .peripheral atrium, small, vitreous, and 

 numerous. 



Five species from New Zealand, Australia, and Tasmania. The triangular 

 pallial sinus of the original description is non-existent. 



To make the description of the family more complete, the synonymy and 

 characters of this genus are included as in some other cases. 



~ Perrierina Bernard (Bull, du Mus. d'hist. Nat., 1897, p. 312) appears to 

 belong in this vicinity, though in addition to the normal hinge characters it 

 has, like Woodia and Transennella, supplementary lamellations on the hinge- 

 line. 



4 



FAMILY KELLIELLIDyE. 



Genus AJ-iVEINUS Conrad. 



Alveinus Conrad, Am. Journ. Conch., i., pp. 10, 138, 1865; Proc. Acad. Nat. Sci. Phila. 



for 1872, p. 53, pi. i, fig. 6, 1872; Am. Journ. Sci., xxix., p. 467, 1885. 

 Lutetia Cossmann, Notes Compl., p. 13, 1894. 



