472 li. J. Bush — Molhisca of Cajye Hattera^. 



LAMELLIBRANCHIATA. 

 Martesia cuneiformis (Say). 



Pholas cuneiformis Say, Journ. PhU. Acad., vol. ii, p. 322, 1822 ; Conch. U. S., p. 



108, 1858. 

 Martesia cuneiformis Tryon, Amer. Mar. Conch., p. 127, pi. 17, figs. 267, 268, 1873. 



A single valve (No. 40,800) was found at station 2276, in 16 fath- 

 oms, and living specimens occurred, imbedded in wood, at Beaufort, 

 N. C. 



Diplothyra Smithii Tryon. 



Proc. Phil. Acad., 1862; Amer. Mar. Conch., p. 128, pi. 17, fig. 269, 1873. 

 A single living specimen, imbedded in limestone, was found in shal- 

 low water at Beaufort, N. C. 



Siliqua costata (Say), h. & a. Ad. 



Machcera costata Gould, Invert. Mass., p. 47, fig. 370, 1870. 



Siliqua costata Verrill, Invert. Anim. Vineyard Sd., p. 075, pi. 32, p. 244, 1874. 



A fragment was found at station 2277, in 16 fathoms. 

 Corbula Swiftiana C. B. Adams. 



Contributions to Conchology, vol. i, p. 236, 1852. 

 Separate valves were found in very great abundance, in 7 to 48 

 fathoms and a few living specimens, in 16 to 48 fathoms, 



Corbula disparilis D'Orbigny. 



La Isla de Cuba, v, Moluscos, p. 322, pi. 27, figs. 1-4, 1845. 

 Separate valves were very common in 14 to 48 fathoms. 



Neaera costata Bush. 



Report U. S. Com. Fish and Fisheries, p. 85, for 1883, 1885. 



Plate XLV, figure 21. 



Shell moderately thick, compressed, triangular-ovate, with a con- 

 tracted and somewhat elongated rostrum, and with three or four very 

 prominent, curved, distant, radiating ribs on the convex part of the 

 valves, and a few smaller and closer ones anteriorly. Umbos high, 

 smooth ; beaks somewhat curved backward. The dorsal margin, from 

 the beaks to the end of the rostrum, is strongly and regularly concave, 

 the rostrum being a little upturned or straight at the tip ; anteriorly, 



