78 Marine Shells of the Western Coast of Florida 



sulci, equidistant and parallel; every alternate sulcus disappears at 

 angle of keel; quality of shell is translucent, showing the yellow and 

 pink lines of the highly polished interior; thin glossy periostracum; 

 three cardinal teeth in right valve; interior shows rays of deeper color 

 near anterior and posterior borders, and a linear callus thickening 

 behind anterior muscle scar; smooth margins. 



Subgenus MOERELLA P. Fischer, 1887 

 Telliiui iiiartinicensis^-*' d'Orbigny PI. 42, fig. 299 



Alt., 8.5; length, 10.5; diam., 5.25 mm. Shell small, white and 

 smooth within and without, epidermis pale brownish, thin, wrinkled; 

 umbos acute, ligament inconspicuous; anterior margin straight near 

 umbo, rounded below; ventral margin convex; posterior margin 

 straight near umbo, suddenly sloping to posterior angle; slight post- 

 erior rostration; anterior and posterior lateral teeth m each valve, 

 distant from umbo. 



Subgenus ANGITLUS'^^ Megerle von Miihlfeld. ISll 

 Tellina nmgnai-'* Spengler PI. 41, fig. 297 



This is the largest of the Atlantic Tellinas. It reaches a length 

 of 75 mm. The shell is smooth, flattened, the upper valve broadly 

 rayed with yellow, lower valve white with yellow tint near umbo. 

 Umbos small, posterior to middle; anterior portion longer and 

 rounded, narrow and angulated posteriorly. 



Tellina agilisi^i' Stimpson(r. tcncra Say) Text fig. 3 



Alt., 8; length, 13 mm. Shell small, inequilateral, polished, thin 

 and pellucid, white or pinkish, iridescent, delicate concentric stria- 

 tions and thin epidermis; small umbos posterior to center; prom- 

 inent external ligament; margins rounded at anterior, shorter at 

 posterior with nearly straight edge; two cardinal teeth in each 

 valve; anterior laterals developed, posterior weak; interior smooth; 

 large rounded, confluent pallial sinus which almost extends to 



'-" mart'inicrnsis, of Martinique. 



^~' Gr., from the root agcho, angled. 



'-■^ Lat., magnus, great. 



^'-^ Lat., ag'tlis, light, easily moved; tencr, tender. 



