ACEPHALA. 407 
TELLINA EXCULTA (Gould). 
T. transversa, solida, trigono-elliptica, tumida, nitida, albida, rosaceo 
viz radiata, concentrice liris tenuibus et radiatim striis tenuissimis in- 
sculpta ; liris in valva dextra postice lamellosis et interruptis, squamas 
simulantibus ; in valve sinistre disco valde obliquis; apicibus post- 
medianis ; latere anticali semi-elliptica ; latere posticali subtriangulart, 
ad apicem valde truncato ; flexura insignt, haud lamellosa : cavositas 
flava ; dentibus value dextre conspicuts. 
Tellina exculta, Gounp; Proceed. Boston Soc. Nat. Hist., i. 253. 
June 1850. Expedition Shells, 80. 
Suet transversely elongated, triangular elliptical, tumid, inequi- 
lateral, rather solid, shining, with alternate watery and snow-white 
zones, and vestiges of numerous faint rust-coloured rays. Beaks behind 
the middle, small; anterior end the half of an elongated ellipse, with 
the upper margin a little less curved than the basal ; posterior end tri- 
angular, the dorsal margin rectilinear and rapidly declining, tip de- 
cidedly truncate, flexure very strongly marked, biangular; right valve 
delicately grooved concentrically, the ridges imbricating backwards; 
posteriorly they become lamellar and are interrupted at short distances, 
so as to resemble rasp-like scales; the whole decussated by very deli- 
cate radiating strie: left valve concentrically grooved like the right 
valve, except a posterior triangular space where they terminate ab- 
ruptly ; none of them are lamellar, and on the central portion they 
shoot obliquely downwards: this valve has also a series of minute, 
radiating strie: the portion occupied by the flexure is destitute of 
sculpture in both valves. Ligament small, moderately imbedded. 
Interior sulphur-yellow, whitish at margin. Lateral teeth in the right 
valve strongly developed. ‘There are little radiating capillary vena- 
tions on the disk of both valves, sometimes plainly seen by trans- 
mitted light. 
Length two inches; height one inch ; breadth nearly half an inch. 
Inhabits the Feejee Islands. 
