MO,LLUSCOIDEA. 361 



1905. Terebrafulina atlantica Johns., Proc. Acad. Nat. Sci. 

 Phil, 1905, p. 6. 



Description. — The dimensions of two specimens are: length, 

 22 mm. and 16 mm.; width, 16.5 mm. and 13 mm.; thickness, 

 12 mm. and 8 mm. Shell subovate in outline, the greatest width 

 at about the mid-length, the valves subequally convex. Pedicle 

 valve strongly convex, with a large prominent beak perforated 

 by a large foramen; flattened or slightly concave along the 

 median line. Brachial valve nearly as convex as the pedicle, 

 usually somewhat elevated along the mesial line into a rather 

 broad, ill-defined fold which is more or less flattened on top, and 

 from which the surface slopes somewhat abruptly to the lateral 

 margins. Surface of the shell marked by numerous, fine, radiat- 

 ing stride, which are visible upon the surface of the internal casts 

 with the aid of a hand lens. Shell structure strongly punctate, 

 the punct« leaving their imprint upon the surface of the internal 

 -casts. 



Remarks. — This species has only been observed in the Horn- 

 «rstown and Manasquan marl, and it is the only brachiopod sO' far 

 known from that horizon. Its usual condition of preservation 

 is in the form of internal casts, but even these specimens preserve, 

 toward the margin of the shell, the fine radiating striae which are 

 •characteristic of the species. It can be easily distinguished from 

 T. hartani, the only other brachiopod from New Jersey which is 

 at all similar in form, by its much smaller size, the absence of the 

 «ubparallel lateral margins, and the fine radiating striae. 



Formation and locality. — Hornerstown marl, near New Egypt 

 (142^); Manasquan marl, Farmingdale (138), Shark River 

 (Whitfield). 



Geographic distribution. — New Jersey. 



Family TBRBBRATELLIDAB. 

 Sub-family MEGATHYRINAE. 



Genus Cistella Gray. 

 Cistella beecheri Clark. 



Plate XXVII., Figs. 14-17- 

 1895. Cistella beecli£ri Clark, John Hopkins Univ. Circ, vol. 

 XV, No. 121, p. 3, Plate, figs. C^-C^ 



