222 Bulletin 29 386 



irregularly spaced and present only near the basal margin, obso- 

 lete proximally ; pallial sinus very deep, extending nearly to the 

 anterior scar ; shell strengthened by an oblique internal ray just 

 posterior to the anterior scar ; teeth delicate but sharp. Length 

 of largest valve 43, altitude 24, semidiameter 3 mm. 



Locality. — (Exp'd'16) Bluff 3, Cercado de Mao. (Scarce). 



Tellina Waylandvaughani, n. sp. 

 Plate 38, Figures 7, 8 



Shell ovate, porcellanous, rounded anteriorly, pointed but 

 not produced posteriorly ; beaks low, sub-central ; posterior dor- 

 sal margin sloping steeply forming a sharp angle with the base ; 

 basal margin sinuous, centrally inflected ; valves discrepant in 

 form and sculpture ; left valve gently convex, evenly, very finely, 

 concentrically grooved, the groovings fading on reaching the um- 

 bonal ridge and represented thereafter by concentric growth- 

 lines ; right valve compressed centrally ; sculptured anteriorly 

 and centrally with concentric groovings similar to those of the 

 left valve but a trifle stronger ; on approaching the umbonal 

 ridge and thereafter the sculpture suddenly grows bolder, the 

 groovings deepening so as to place the intervening ridges in quite 

 high relief ; in certain lights faint traces can be seen on both 

 valves of obsolete radial strise, especially on the anterior half of 

 the shell; pallial sinus deep, reaching almost to the anterior 

 muscle scar ; our single shell is thickened internally in the umbon- 

 al region appearing somewhat pathologic ; each valve is strength - 

 ened by a very strong, anterior, internal ray and a feeble posterior 

 one. Length 45, altitude 24, diameter 11 mm. 



This, our handsomest Tellina is named in honor of Dr. T. 



Wayland Vaughan, as a token of friendship and appreciation of 



his very great kindness in obtaining for us reports on our Fora- 



minifera, Bryozoa, Echinoderms and Crustacea and himself writ- 



ng a very valuable and beautiful report on our Corals. 



Locality. — (Exp'd' 16) Zone G, Rio Gurabo at Los Que- 

 mados. 



