102 JOURNAL OF THE NEW JERSEY 



1, Tellina, L. 



Shell slightly inequivalve, compressed, rounded in front, angu- 

 lar and slightly folded behind ; umbones nearly central ; liga- 

 ment prominent. 



Animal with long, slender, diverging siphons, their orifices plain. 



1. Tellina tenera, Say. Shell oblong, sub-oval, longer and round- 

 ed in front, somewhat pointed behind, thin, pellucid, delicate ; sur- 

 face regularly and delicately marked by sharp lines of growth ; 

 pallial sinus nearly reaching the anterior muscular impression ; 

 one distinct, grooved, cardinal tooth in each valve, the second 

 indistinct ; ligament short. Color white, or slightly tinged with 

 rose-color, sometimes concentrically banded, polished and irides- 

 cent. L. 14; H. 9; W. 3; U.f; An. 130°.— Whole coast. 

 Abundant on sandy beaches. 



2. Tellina tenella, Verrill. Shell oblong with the front dorsal 

 margin nearly straight or sometimes concave ; umbones scarcely 

 prominent ; posterior end short, sloping rapidly from the um- 

 bones and somewhat truncate at the end ; ventral margin slightly 

 convex ; ligament longer than in the preceding species ; color 

 pink, light straw-color, or white often banded concentrically with 

 these colors and rendered somewhat iridescent with very fine 

 concentric stride. L. 14 ; H. 9 ; W. 3 ; U. f ; An. 140°. Cape 

 Cod and south in 4-10 fathoms. 



2. Macoma, Leach. 

 Shell oval, convex, umbones small; cardinal teeth narrow, 

 two in each valve ; lateral teeth none. 



Animal with a single branchial lamella on each side. 



1. Macoma tenia, Say. Shell oval-ovate, shorter, narrower, 

 widely gaping and very much warped iDehind ; valves very con- 

 vex, the left one more so and with its posterior end bent outward ; 

 outer surface shining but not polished, minutely wrinkled by 

 lines of growth and a few, fine, radiating lines across the middle ; 

 two cardinal teeth in right valve, and one in the left ; ligament 

 short ; muscular and pallial impressions distinct. White. L. 15; 

 H. 10 ; W. 5 ; U. less than | ; An. 150°.— Cape Cod and south. 

 Common in mud. 



2. Macoma baltica, L. Shell thin, fragile, oval-orbicular, slightly 

 narrowed and pointed behind ; cardinal teeth, two in each valve, 

 slender and slightly diverging ; muscular impressions distinct ; 



