24 Palaeontographica Americana 24 



bent down;_base receding mesially; cardinal area short and wide in front of the beaks, 

 long and narrow behind them, in front smooth or longitudinally striated, behind with a 

 few oblique grooves ; sculpture of small, flat, radial ribs arranged in pairs with narrower 

 interspaces, and between every set of two pairs and the next a wider interspace, as if the 

 ribs were quadripartite; these ribs cover all the shell, more sparsely on the posterior dor- 

 sal slope, and are crossed at wide bvit not perfectly regular intervals by narrow, flat, con- 

 centric ridges; inner margin of the vah'es smooth, excejit when modified by the external 

 ribbing; hinge two-thirds as long as the shell, with four rather large oblique anterior 

 teeth separated by a wide edentulous gap from a row of about twenty short vertical teeth, 

 which merge into a group of six or seven oblique posterior teeth, becoming larger distally ; 

 the extreme distal teeth in full-gro\^Ti specimens sometimes break up into irregular gran- 

 ules. Length of adult shell 52, of hinge-line 29, alt. of shell 23, diam. 21 mm." — Dull, 

 1898. 



Occurrence. — Pliocene marls of the Caloosahatchie and Shell Creek, Florida, and of 

 the Croatan beds of North Carolina, at Mrs. Guion's marl pit. — Dall. 



Macrodon asperula Dall;' Plate V, Figures 8, 9; Dall, Bull. Mus. Comp. Zool. Har- 

 vard, vol. 9, p. 120, 1881; vol. 12, p. 244, p. 8, figs. 4, 4a, 1886; U. S. Nat. Mus., Bull. 

 37, p. 42, pi. 8, figs. 4, 4a; Benfhaira asperula Verrill and Bush, Proc. U. S. Nat. Mus., 

 vol. 20, p. 842, 1898; Barbatia {Cucullaria) asperula Dall, Wagner Free Inst. Sci., Trans., 

 vol. 3, p. 659, 1898, is given by Dall as recent from Fernandina to Yucatan in three 

 hundred and ten to fifteen hundred and sixty-eight fathoms. The name is preoccupied 

 in Ai'ca by Deshayes, An. S. Vert., vol. i, p. 883, pi. 66, figs. 4-6, i860. Ball's species 

 might be called Area paserula. 



Macrodon sagrinaia Dall; Plate V, Figure 10; Dall, Bull. Mus. Comp. Zool. Har- 

 vard, vol. 12, p. 24s, 1886; U. S. Nat. Mus., Bull. 37, p. 42, 1889; Barbatia (Cucullaria) 

 sagri7iaia Dall, Wagner Free Inst. Sci., Trans., vol. 3, p. 659; Area {Cucullaria') sagri- 

 naia Dall, U. S. Nat. Mus., Proc, vol. 24, p. 508, pi. 31, fig. 2, 1902, is from water 

 eighty fathoms deep northwest of Cuba. 



Area profimdicola Verrill; Plate V, Figures 11, 12; Verrill, Trans. Conn. Acad., vol. 

 6, p. 439, pi. 44, figs. 23, 23a, 1885; Dall, Bull. Mus. Comp. Zool. Harvard, vol. 12, p. 

 24s, 1806; Macrodon profundieola Dall, U. S. Nat. Mus., Bull. 37, p. 42, pi. 46, figs. 23, 

 23a, 1889; Barbatia {Cucullaria) profundieola Dall, Wagner Free Inst. Sci., Trans., vol. 

 3, p. 659, 189S; Bathyarca profundieola Verrill and Bush, Proc. U. S. Nat. Mus., vol. 20, 

 p. 844, pi. 78, fig. 2, 1898, has been found in deep water off the northeastern and 

 southern coasts of the United States. 



Area lactoeofnata T)a\\; Plate V, Figures 13, 14; Dall, Bull. Mus. Comp. Zool. Har- 

 vard, vol. 12, p. 243, pi. 6, figs. 9, 10, 1886; vol. 18, pp. 433-435, 1889; U. S. Nat. Mus., 

 Bull. 37, p. 40, pi. 6, figs. 9, 10, 1889, is from eighty-two to one hundred and sixty-nine 

 fathoms from Martinique and Barbados. 



Area {Barbatia) pteroessa E. A. Smith; Plate V, Figures 15, 16, 17; Smith, Chal- 

 lenger Rep., Lam., p. 262, pi. 17, figs. 4-4b, 1885; Bathyarca pteroessa Verrill and Bush, 

 Proc. U. S. Nat. Mus., vol. 20, p. 843, 1898; Area {Cucullaria) pteroessa Dall, Bull. Mus. 



