ART. 18 SMALL SHELLS DREDGED BY "ALBATROSS '' DALL 111 



Family FISSURELLIDAE 



Genus DIADORA Gray 



DIADORA BERMUDENSIS Dall and Bartsch 



Fissuridea hermudensis Dall and Bartsch, Proc. U. S. Nat. Mus., vol. 40, 

 No. 1020, p. 286, pi. 35, fig. 8, 1911. 



Off Georgia, one dilapidated specimen probably of this species and 



doubtless derived from shallow water. U. S. Nat. Mus. Cat. No. 



108284. 



Genus PUNCTURELLA Lowe 



PUNCTURELLA PROFUNDI Jeffreys 



Puncturella profundi Jeffreys, Proc. Zool. Soc, London, for 1882, p. 675, 

 pi. 50, fig. 10. 



Off Fernandina and Georgia, 19 specimens. Bay of Biscay in 1,003 

 to 1,450 fathoms, Travailleur expedition. Off Culebra Island, West 

 Indies, in 390 fathoms, Challenger expedition. 



The Florida shells appear from the original figure and specimens 

 in the Jeffreys collection to be typical. A variety occurs in which 

 the radial sculpture alternates stronger and weaker and is more or 

 less granulated by incremental lines, which may take the name of 

 jnultifila. 



PUNCTURELLA OXIA Watson 



Puncturella oxia Watson, Journ. Linn. Soc, vol. 17, p. 36, 1883; Challenger 

 Rep., Gastr., p. 44, pi. 4, fig. 8, 1886. 



Shell minute, conical, white, ovate, the anterior slope somewhat 

 €onvex, the posterior concave, the foramen nearly central, large for 

 the size of the shell, the nuclear whorl not persistent, the internal 

 septum nearly vertical ; sculpture of divaricate and obliquely reticu- 

 late crowded rows of granules, those on the sides divaricating from 

 the middle line of the side; margin entire, the interior smooth. 

 Length of shell, 3.2; breadth, 2.4; height, 1.5 mm. U. S. Nat. Mus. 

 Cat. No. 108286. 



Off Fernandina and Georgia, two specimens. Off Culebra Island, 

 West Indies, in 390 fathoms, Challenger expedition. 



The sculpture is quite remarkable. 



PUNCTURELLA HENDERSONI, new species 



Shell elevated, dingy white with a dextrally incurved apex and a 

 rather long narrow slit extending about one-third of the way to the 

 base; vertical sculpture of about 48 narrow ribs with much wider 

 interspaces and occasional smaller intercalary riblets, the former 

 crenulating the margin; concentric sculpture of uniform fine con- 

 spicuous threads with narrower interspaces covering the whole shell 

 and minutely crenulating the vertical sculpture. Height, 9; length, 

 10.2; breadth, 8 mm. U. S. Nat. Mus. Cat. No. 333471. 



