AKT. 18 SMALL SHELLS DREDGED BY '' ALBATROSS ' ' BALL 11 



Genus PRISTIGLOMA Dall, 1900 



PRISTIGLOMA NITENS Jeffreys 



Glomus nitens Jeffreys, Ami. Mag. Nat. Hist., Nov. 1876, p. 433. — Verrill 



and Bush, Amer. Journ. Sci., vol. 3, pp. 53, 59, Jan. 1897; Proc. U. S . 



Nat. Mus., vol. 20, No. 1139, p. 848, pi. 97, figs. 1, 2, 1898. (Not GZomus 



Gistel, 1848.) 



Off Fernandina, one valve. From off Martha's Vineyard south to 



Rio de la Plata in 1,504 to 1,900 fathoms, U. S. S. Albatross. 



This curious form seems intermediate between forms like Pseudoglo- 

 mus and Limopsis- The minute wrinl^les indicated as "lateral teeth" 

 do not occur on other specimens than Verrill's type and are possibly 

 an individual development. At any rate they are barely perceptible 

 under the microscope and may be pathological. 



Family ARCIDAE 

 Genus LIMOPSIS 



LIMOPSIS TENELLA Jeffreys 



Limopsis Icnella Jeffreys, Ann. Mag. Nat. Hist., Nov. 1876, p. 433. — 

 Dall Bull. Mus. Comp. Zool., vol. 9, p. 118, 1881; vol. 12, No. 6, p. 

 236, 1886. 



Off Fernandina, a few young specimens. 



This species was dredged in immense numbers off the Florida coast 

 and among the Antilles by Mr. J. B. Henderson; and by the Albatross 

 as far south as Puerto Gallegos in southern Argentina, latitude 51° 

 south, and in depths from 50 to 700 fathoms. 



LIMOPSIS MINUTA Philippi 



Pectunculus minutus Philippi, Moll. Sicil., vol. 1, p. 63, pi. 5, fig. 3, 1836; vol. 



2, p. 45, 1844. 

 Limopsis borealis Woodward, teste Jeffreys. 

 Limopsis minuta Dall, Bull. Mus. Comp. Zool., vol. 9, No. 2, p. 119, 1881; 



vol. 12, No. 6, p. 236, 1886.— Verrill, Proc. U. S. Nat. Mus., vol. 20, 



No. 1139, p. 846, pi. 75, fig. 1 ; pi. 78, fig. 7, 1898. 



Off Georgia and Fernandina. South to the lesser Antilles in 30 to 

 2,221 fathoms. 



LIMOPSIS RADIALIS, new^species 



Shell minute, white, subovate, moderately convex, with the inner 

 margins minutely crenate; beaks small, prominent; hinge line short, 

 teeth on each side few, small, somewhat radially arranged; sculpture 

 of low small regular concentric rounded ridges crossed by about a 

 dozen widely spaced rather prominent radial threads. Length, 3.7; 

 height, 3.8; diameter, 2; hinge line, 2 mm. U. S. Nat. Mus. Cat. No. 

 108184. 



Off Fernandina, four valves. 



The sculpture is somewhat like that of L. antillensis Dall, but the 

 form and hinge quite different. 



