NO. 1312. SYNOPSIS OF THE VENERID.E-DALL. 381 



TIVELA BRASILIANA, new species. 

 Plate XII, fig. 3. 



Shell subtriangular, tiattish, with high, pointed, opisthoo-yriitebeai^.s; 

 cream color with darker yellowish zones; surface smooth; lunular 

 region impressed, lunula narrow, elongate, pouting a little at the junc- 

 tion of the valve margins; posterior slope straight, flattened, with a 

 short ligament; interior pale yellow brown; hinge with live right card- 

 inals, the posterior pair rugose; the anterior lateral adjacent, strong: 

 the pallial sinus rounded, about as large as the posterior adductor scar. 

 Length 40; height 34; diameter 20 mm. 



Type locality. ~^&ntsi Caterina, Brazil. Cat. No. 125468, U.S.N. M. 



This peculiarly flat and triangular form recalls the T. planulata Sow- 

 erby, of the Pacific coast. 



CALLOCARDIA (AGRIOPOMA) ZONATA, new species. 

 Plate XII, %. 4. 



Shell small, thin, arcuate, with a dull surface, whitish with concen- 

 tric zones of yellow brown: surface concentrically striated or sulcate 

 with wider interspaces, forming low riblets; beaks high, inflated, their 

 apices small, anteriorly directed, lunule large, cordate, deflned by a 

 sulcus; no visible escutcheon; ends rounded, base prominenth^ arcuate; 

 interior porcellanous, with a small ascending angular pallial sinus; 

 hinge verging toward CMonella. Length 23; height 18.5; diameter 

 14 mm. 



Type loeallty. — United States Fish Commission station 2608. in 22 

 fathoms, sand, off the coast of North Carolina. Cat. No 92015, 

 U.S.N.M. 



CYTHEREA (VENTRICOLA) STRIGILLINA, new species. 

 Plate XII, fig. 5. 



Shell rotund, inflated, grayish white; beaks prominent, their apices 

 anteriorly directed; lunule deeply impressed, cordate, striated; disk 

 covered with low, uniform, slightly recurved thin primary concentric 

 lamelhe, a])out 1 millimeter apart, the interspaces with much finer 

 and smaller secondary laraelhe; there is no defined escutcheon, but the 

 posterior dorsal slope, as usual, is less prominently lamellose; hinge 

 strong, with large teeth, the anterior lateral large, and the posterior 

 cardinal on the right valve bifid; pallial sinus very small, wide, and 

 angular; internal margins of the valves finely crenulate. Length 45; 

 height 39; diameter 32 mm. 



Type locdllfy. — United States Fish Commission station 2317, in 45 

 fathoms, coral, ofl' Key West, bottom temperature 75^ F. Cat. No. 

 9566S, U.S.N.M. 



