254 



clivi ; latere antico vix paululiun longiorCj ad extremitatem rotuii- 

 (lato ; extremitate postica obtusissime subangulata ; natibus acutis^ 

 j)roimiientibus, recto incurvatis ; ligameiito angustissimo,, infosso ; 

 umbonibus plerumque fiavis ; flexura ventrali costaque umboiiali 

 satis conspicuis ; superficie interna liava ; dentibus lateralibus 

 niagnis, subsequidistantibus. 



Shape varying from obovate to suborbicular, moderately strong, 

 decidedly convex, when quite perfect dull and covered with raised 

 membranaceous concentric strise, but usually worn smooth and 

 rather glossy; whitish or yellowish, with numerous narrow red rays 

 and the umbones tinged with yellow ; ventral edge arcuated ; both 

 edges of the dorsal Une convex and moderately sloping ; front ex- 

 tremity rounded ; that of the scarcely shorter posterior side most 

 obtusely subangulated ; beaks prominent and incurvated ; ligament 

 extremely narrow and sunken ; fold and umbonal ridge tolerably 

 manifest ; inside yellow ; lateral teeth large and nearly equidistant. 



Mediterranean. 



59. Tellina obliquilineata (pl.lvi. f. 11, and pl.hx. f.l27.) 

 Conrad, Jour. Ac. N. S. Philad. 7. 



T. testa parva, ovata, tenuiuscula, iuEequilaterali, convexa, nitida, 

 intus extusque flavescente aut rosaceo-incarnata, tenuissime striata ; 

 striis obhquis et antice flexuosis; margine ventrali subarcuato; 

 dorsali antice arcuato et declivi, postice longiore convexiusculo et 

 angulum acutum cum margine ventrali formante; latere antico 

 brevi, rotundato; postico producto, acuminato; natibus ligamento 

 (jue parvo ])rominulis; flexura costaque umbonali inconspicuis ; 

 dentibus laterahbus satis distinctis, subsequidistantibus, antico 

 uiajore. 



Small, ovate, rather tliin, very inequilateral, glossy, convex, 

 tinged both externally and internally with yellow or rosy flesh- 

 (;olour, and most dehcately but distinctly striated in oblique lines 

 which become llexuous in front ; the ligament small and scarcely 

 projecting ; the beaks rather prominent ; the umbonal ridge and 

 the fold not conspicuous; anterior side short and rounded, the 

 dorsal slope rather sudden and very convex ; posterior side pro- 

 duced, and rendered acuminated by the elongated and rather con- 

 vex hgamental edge forming an acute angle with the rather arcuated 

 ventral ; lateral teeth distinct, neither very distant, the anterior 

 decidedly larger. 



Sandwich Isles. 



60. Telllna AMruLLACEA (pi. Ivi. f. 23, 21.) Phllipp'i, (June 



