FOSSILS OF THE BURLIXGTOX GEOUP. 369 



BATOCRIXUS QUASILLUS, M. and W. 



PL 5, Fig. 2. 

 Batocrinui quatiUu*. MEKK Mid WoRTHKN. Proceed. Acad. Nat. ScL, Phila.. 1869, p. 35-2. 



BODY rather depressed, wider than high, nearly as prom- 

 inent above as below the arm-bases; sides spreading very rap- 

 idly from the top of the first radials to the brachial pieces, 

 which are in close contact all around, so as entirely to isolate 

 the anal and iuterradial pieces from the vault. Base com- 

 paratively rather broad, being nearly three times as wide as 

 high, truncated and rather deeply excavated below, so as to 

 overhang the end of the column ; somewhat spreading below, 

 with broad, shallow notches at the sutures. First radials 

 nearly twice as wide as high, two heptagonal and three hex- 

 agonal, and, like all of the other body plates (excepting the 

 second radials), moderately tumid. Second radials gen- 

 erally very short, and sometimes in part merely trans- 

 versely linear, or even entirely obsolete, all quadrangular, 

 and flat on the outer side. Third radials small, generally 

 pentagonal, and in all but the two posterior rays support- 

 ing on each of its superior sloping sides one, or sometimes 

 two secondary radials, the last of which (where there are 

 more than one) is an axillary piece, and bears in direct suc- 

 cession on each of its superior sloping sides, two brachial 

 pieces, thus making four arms to each of these rays. In 

 each of the posterior rays, however, there are two other 

 bifurcations, that make six arm openings to each of these 

 rays, or twenty-four to the entire series. First anal plate 

 of much the same size and form as the first radials, and 

 supporting in an arching series above three smaller pieces 

 in the second range, while above the latter, one, or perhaps 

 sometimes two smaller pieces connect with the brachials 

 above. First interradials about two-thirds as large as the 

 first radials, and each supporting a smaller piece extending 

 up to the brachials above. Vault composed of tumid, or 

 sometimes rather obtusely pointed pieces, and provided 



