ART. 18 SMALL. SHELLS DREDGED BY ALBATROSS DALL 7 



Family TEREBRATULIDAE 



Genus DALLINA Beecher 



* DALLINA FLORIDANA Pourtales 



Waldheimia floridana Pourtales, Bull. Mus. Comp. ZooL, vol. 1, p. 127, 

 1868. — Dall, Bull. Mus. Comp. Zool., vol. 3, p. 12, pi. 1, fig. 3; pi. 2, 

 figs. 1, 2, 3, 1871. — Davidson, Mon. Rec. Brach., pt. 2, p. 59, pi. 12, 

 figs. 1-5,1887. 



Dallina floridana Beecher, Trans. Conn. Acad. Sci., vol. 9, p. 382, pi. 1, fig. 

 45, 1893.— Dall, Annot. List Rec. Brach. Nat. Mus., p. 358, 1920. 



Off Fernandina and in the Gulf of Mexico and southward to 

 Porto Rico, in 90 to 270 fathoms. 



Family DISCINIDAE 



Genus PELAGODISCUS Dall 



PELAGODISCUS ATLANTICUS King 



Discina atlantica King, Proc. Nat. Hist., Soc. Dublin, vol. 5, pp. 170-173, 

 1868.— Jeffreys, Ann. Mag. Nat. Hist., ser. 4, vol. 18, p. 252, 1856.— 

 DAViDson, Challenger Brach, p. 62, pi. 4, figs. 17-18, 1880. 



Discinisca atlantica Dall Proc. Acad. Nat. Sci. Phila. for 1873, p. 201. — 

 Davidson, Mon. Rec. Brach., pt. 3, p. 200, pi. 26, figs. 18-22,1888. 



Pelagodiscus atlanticus Dall, Bull. Mus. Comp. Zool., vol. 43, pt. 6, p. 440, 

 1908; Annot. List. Rec. Brach. Nat. Mus., p. 280, 1920. 



Off Fernandina and in both Atlantic and Pacific Oceans in depths 

 down to 2,995 fathoms. 



MOLLUSCA 



PELECYPODA 

 Family NUCULIDAE 



Genus NUCULA Lamarck 



NUCULA CULEBRENSIS E. A. Smith 



Nucula culebrensis E. A. Smith, Challenger Pelecypoda, p. 228, pi. 18, figs. 

 11, 11a., 1885. 



Off Georgia and Fernandina, rather common; off Culebra Island 

 in 390 fathoms at station 24 of the Challenger expedition. 



The teeth average 7 and 14 on the two sides of the beak; the 

 young shells hardly indicate the minute crenulations of the margin 

 which are developed in the adults. Nucula crenulata A. Adams, from 

 Guadeloupe may be identical with this species but in the absence of 

 authentic specimens of crenulata it seems safer to adopt Smith's 

 name about the application, of which there is no doubt. The mar- 

 gin of the escutcheon is usually crenulate. 



