MOLLUSCA. 6n 



JSTavesink marl, near Wain ford (i48 2 ), Crosswicks Creek 



(I47 4 )- 



Geographic distribution. New Jersey, Alabama. 



Genus CARYATIS Roemer. 



Caryatis veta Whitfield. 

 Plate LXVIIL, Figs. 11-12. 



1869. Caryatis delawarensis Con., Am. Jour. Conch., vol. 5, p. 



41, pi. i, fig. 6. (Not Dione delawarensis Gabb.) 

 1886. Caryatis veta Whitf., Pal. N. ]., vol. i (Monog. U. S. 



G. S., vol. 9), p. 218, pi. 28, figs. 16-19. 



Description. The dimensions of a rather large individual are: 

 length, 24 mm.; height, 20 mm.; thickness, 15 mm. Shell sub- 

 ovate in outline; the beaks large, prominent, slightly incurved, 

 situated about one-third the length of the shell from the anterior 

 extremity. Hinge-line arcuate ; anterior margin rather narrowly 

 rounded; basal margin convex, curving upward more rapidly 

 in front than behind; posterior margin rounded or sometimes 

 obscurely subtruncate; post-cardinal margin convex, sloping 

 rather steeply from the beaks. Valves ventricose, the surface 

 curving most abruptly to the antero-cardinal margin, and slightly 

 inflected to the lunular depression in front of the beaks; post- 

 umbonal surface rather abrupt, but without a distinct umbonal 

 ridge. Surface of the casts nearly smooth the muscular impres- 

 sions inconspicuous, the pallial line faint, but the deep, broad 

 and pointed sinus, directed obliquely upward towards the lunular 

 depression can frequently be detected. External surface of the, 

 shell rarely seen, marked by fine concentric lines of growth. 



Remarks. This species is one of the common members of the 

 Manasquan marl fauna, and it usually occurs wherever fossils 

 are found in this formation. Its characters are sufficiently dis- 

 tinct so that it need not be confused with any other shell associated 

 with it in the same fauna. 



Formation and locality. Hornerstown marl, near New Egypt 

 (I42 1 ); Vincentown limestone, near New Egypt (143), near 



