271 



arcuated ; anterior side much the longer, rather dilated, rounded, 

 its dorsal edge convex and not greatly sloping ; posterior side termi- 

 nating in a short beak, which is placed very high up owing to the 

 shortness and small slope of the incurved dorsal edge ; fold pro- 

 minent ; ligament minute and sunken ; beaks acute ; inside white ; 

 lateral teeth distinct, subequidistant. 

 St. Elena, West Columbia. 



90. Tellina Burneti (pLlviii. f. 99.) Broderip w&Sowerby, 

 Zool. Jour. vol. 4. p. 362. t. 9. f. 2 ; Hani. Des. Cat. p. 72. t. 13. 

 f. 51. 



T. testa trigona, suborbiculari, subtenui, subsequilaterab, inse- 

 quivalvi, compressa, Candida, submargaritacea ; valvula planulata 

 lineis elevatis concentrice striata; valvula convexiore sulcis dila- 

 tatis concentricis obsoletissime antice et superne ornata ; margine 

 ventrah arcuato ; dorsab utrinque valde dechvi et dentato, antice 

 valde incurvato, postice subrecto ; natibus acutisshnis, antice in- 

 cumbentibus ; ligamento minhno lunulaque maxima infossis ; 

 flexura distincta; dentibus lateralibus distinctis, subasquidistan- 

 tibus. 



Triangular, rather thin, inequivalve, subcquilateral, compressed, 

 subnacreous, wlute ; the convex valve with obsolete distant dilated 

 concentric grooves, which are most visible in front and towards 

 the elevated acute and curving beaks (one of which projects over 

 the other) ; the flat valve with elevated fine rather irregular and 

 close concentric strise, winch become obsolete posteriorly ; ventral 

 edge arcuated ; dorsal edges strongly sloping on either side, and 

 armed with large tooth-like projections, the front one greatly in- 

 curved, the hinder nearly straight ; ligament minute ; dorsal slopes 

 excavated ; fold and flexure distinct ; lateral teeth distinct, rather 

 remote, and subequidistant. 



Salango, W. Columbia. 



91. Tellina lyra (pi. lxii. f. 187 .)IIanley, Zool. Proc. 1844. 



T. testa elliptica, tenui, compressa, nitidiuscula, intus extusque 

 alba, striis concentricis elevatis ornata; striis antice et inferne 

 confertioribus, interstitiis laevigatas ; margine ventrali medio con- 

 vexiusculo, utrinque arcuato; dorsali postice elevatiore convexo 

 satisque declivi, antice prope lunulam excavatam, aut horizontali 

 aut leviter accbvi; latere antico paululum longiore, rotundato; 

 extremitate postica obtusa ; ligamento infosso ; natibus acutis, 

 prominentibus, incumbentibus ; tiexura obsoleta ; dentibus latera- 

 libus distinctis, antico approximato, postico parvo, remotiore. 



