10 PROCEEDINGS OF THE NATIONAL MUSEUM vol.79 



mington, N. C, but its shell is narrower, is more elevated over the 

 anterior side, and is sculptured with less distinct radials. 



CARDIUM (TRACHYCARDIUM) EVERGLADEENSIS, new species 



Plate 4, Figubes 1, 3, 9 



Description. — Shell rather small, solid, subquadrate, slightly 

 oblique, and moderately inflated. Middle of shell and anterior side 

 rounded; posterior side more steeply declining. Anterior margin 

 broadly rounded, ventral margin narrowly rounded, posterior mar- 

 gin nearly straight. Sculpture of 29 to 31 (ontheholotype 31) nearly 

 flat, narrow, high ribs, which are separated by moderately narrow 

 spaces over the middle of the disk and more closely spaced over the 

 sides. Crest of ribs ornamented with thin, nearly erect, marginally 

 reflected funnel-shaped structures, which are more closely spaced on 

 the anterior side than on posterior. The surfaces of the ribs are cor- 

 roded over the middle of the shell and only the basal parts are 

 revealed. A patch of callus covers the inside of the shell. 



Dimensions. — Holotype, left valve (U.S.N.M. No. 371343), meas- 

 ures : Length, 34 mm. ; altitude, 39 mm. ; semidiameter, 15 mm. 



Type locality. — Tamiami Trail, 42 miles west of Miami, Fla. 



Cardium {Tradiycardiwin) evergladeensis most closely resembles 

 C. isocardia Linnaeus in outline but differs from it in having a more 

 quadrate shell. The character of the sculpture on the ribs is also 

 different. 



The material at hand consists of only two left valves, one of which 

 constitutes the holotype. 



PARASTARTE MARTENSI, new species 



Plate 4, Figures 4, 6, 7, 8 



Description. — Shell very small, trigonal, moderately convex, 

 slightly inequilateral and oblique. Beaks rather low, pointed, and 

 anteriorly directed. Back of valves gently rounded, sides pre- 

 cipitous. Posterior margin very broadly rounded and longer than 

 anterior; anterior margin nearly straight except at lower part, 

 where it curves outward; ventral margin broadly rounded. Lunule 

 large, lanceolate, bounded by distinct lines, and longitudinally crossed 

 by fine threads. External sculpture of moderately fine, slightly raised 

 concentric lamellae. Hinge with three cardinals, the middle tooth 

 in each valve being the strongest. Posterior lateral margin of right 

 valve and anterior lateral margin of left valve sulcated to receive the 

 edge of the opposite valve. Inside ventral margin not crenulated. 



