MUSEUM OF COMPARATIVE ZOOLOGY. 119 



Limopsis minuta Philippi. 



Pectunculits minutus Philippi, En. Moll. Sic, I. p. 63, Tab. V. fig. 3; II. p. 45. 

 Limopsis borealis Woodward, Sars, etc. , teste Jeffreys. 



Gulf of Mexico, west of Florida, in 30 fms. ; Station 36, 84 fms.; Barba- 

 dos, 100 fms.; Bache, Apr. 22, 1872, Lat. 21° 14' X., 100 fms.; Sigsbee, off 

 Cuba, 119 fms.; Station 20, 220 fms.; off Morro Light, 292 fms.; Station 19, 

 310 fms.; Sigsbee, off Havana, 450 fms.; Yucatan Strait, 640 fms.; Station 2, 

 805 fms. 



The teeth in this species vary from six to eleven ; the proportional width of 

 the hinge-line, obliquity of the shell, etc., are most variable. 



Limopsis cristata Jeffrets. 

 L. cristata Jeffreys, Ann. Mag. Nat. Hist., Nov. 1876, p. 434. 



Yucatan Strait, 640 fms. 



Several detached valves, probably of this species, which seems to be a well- 

 founded one. 



Limopsis antillensis n. s. 



Shell small, moderately thick, rather inflated, inequilateral, shovel-shaped, 

 short, elevated ; hinge-line straight, with a narrow quadrangular area, in the 

 middle of which is a narrow space scooped out triangularly in each valve for a 

 ligament ; anterior margin nearly perpendicular to the hinge-line, gently round- 

 ing into the evenly rounded base ; posterior margin obliquely truncate, the 

 truncation extending nearly to the base and being bounded by a straight or 

 slightly concave line ; at the point where the truncation rounds into the base 

 the interior shows three or four particularly strong ridges rising to small tuber- 

 cles just within the margin ; hinge teeth six in each valve ; from just in front 

 of the cartilage pit three teeth extend forward enlarging progressively, the an- 

 terior tooth considerably the largest, all perpendicularly placed with regard to 

 the cardinal margin, long and rather slender in the young, stouter and more 

 obtuse in the older shells ; behind the cartilage-furrow or pit the hinge is eden- 

 tulous for a little space, then bears three teeth, one below the other, nearly 

 parallel to the hinge margin, the largest uppermost, the smallest being the last 

 in the series ; inner margin lightly crenulate, crenulations most evident toward 

 the basal angles, where also traces of internal radiating ribleta are visible, of 

 which the tubercles form the terminations; sculpture of close-set, rounded, con- 

 centric ridges with a greater or lesser number of fine radiating distant raised 

 threads intersecting them, most evident in the furrows but not greatly breaking 

 the continuity of the concentric sculpture ; color white; several specimens show 

 a pink color-ray in the posterior portion, one is wholly a bright lemon-yellow. 



