NUCULA. 



149 



Fi?. 456 a 



distant from each other. A|>ices separated by a long narrow space, 

 and sitnatod at the termination of the posterior (anterior) third of 

 tlie k^igth of the hino-c-margin ; extremities of tlie hinge-margin 

 angulatcd ; anterior (posterior) edge, the 

 superior half rectilinear ; posterior (ante- 

 rior) edge rounded ; infei'ior edge nearly 

 rectilinear, or very obtusely rounded ; on 

 the hinge space, one or two angulated lines 

 are drawn i'rom the ajjex diverging to the 

 hinge edge." ( *'^V///.) Length, one and a 

 half inches ; height, one inch : breadth, 

 one and a half inches. 



Found about the sands of Nantucket and Martha's A'ineyard, and 

 it is said to be not unconnnon in Buzzard's Bay- Osterville {Has- 

 kell) ; Gull Lsland (<S. Smith) ; from Artesian well, Provincetown, 

 one hundred and twenty to two hnndred feet below surface. 



I have qu(jted the description l)y jNIr. ^Say, above, merely inter- 

 changing the terms anterior and posterior, to accord with the parts 

 of the shell to which those terms are ajiplied in other parts of the 

 Report. The position of the beaks distinguishes it from the pre- 

 ceding species, as well as the form of the shell. 



Oentis NUCULA, Lamarck. 1799. 



Shell transverse, without an area for the ligament lietween the 

 beaks ; a straight scries of teeth each side, forming an angle at a 

 spoon-shaped pit which separates them. 



Nucula tenuis. 



Fig. 64. 



Shell trapezoidal, thin, smooth, without radiating lines; epidermis grass-green: 

 beaks prominent, placed posteriorly ; margin simple, teeth very lew. 



Area tennis, Montagu, Tes5t. Brit. Suppl. 56, pi. 29, fig. 1. — Dillwtn, Catal. i. 246. — 



TuRTON, Conch. Diet. U. — Wood, Ind. Test. pi. 10, fig. 45. 

 Nucula tenuis, Turton, Brit. Biv. 177. — Fleming, Brit. Anim. 402. — Brown, 111. 



Conch. G. Br. 85, pi. 33, fig. 13. — Hanlky, Eecent Shells, i. 171, pi. 10 (Area), fig. 



45. — McGiLLiv. Moll. Aberd. 244; Br. Mar. Conch. lO-i. — Forhes and Hanl. 



Br. Moll. ii. 223, pi. 47, fig. 6, and pi. P. fig. 5 (animal). — Loven, Ind Moll. Scand. 



34 — Mighels, Shells of Maine; Bost. Journ. iv. 323. — Stimpson, Shells of New 



England, 8. — Packard, Labrad. Mar. An. 13. — Sowekby, Conch. 111. No. 33, 



figs. 140, 141. 



