FOSSILS OF THE BUKLIXUTON (JBOUF. 405 



POTERIOCRIXITES, Miller. 



POTERIOCRIXITES? PERPLEXUS, M. and W. 



PL 2, Fig. 12. 

 Poteriocrinites f perplexus, MEEK and WOKTHEN. Proceed. Acad. Nat Sci, Phila., 1869, p. 138. 



BODY small, somewhat cup-shaped, with sides a little 

 expanding above and rounding to the column below; hight 

 to top of first radial pieces more than half the breadth at 

 the same point. Base small, much depressed, or nearly 

 flat, with a pentagonal outline. Subradial pieces each 

 nearly as large as the whole base, about as wide as long, 

 three hexagonal and two heptagonal (counting a very ob- 

 tuse angle at the middle of the base of each.) First radials 

 nearly twice as large as the subradial pieces, and propor- 

 tionally wider, pentagonal in form, and each with a mod- 

 erately deep, rounded sinus, rather more than half the 

 breadth of its upper margin, for the reception of the suc- 

 ceeding radials. Anal pieces presenting the usual arrange- 

 ment of a double alternating series, the lowest being partly 

 under one side of the first radial on the right, while the 

 next on the left of this rests on the truncated upper edge 

 of one of the subradials, and these connect with others above, 

 that form the base of the proboscidiforin ventral extension. 

 Second radials very small and short, or scarcely more than 

 filling the sinuses in the first. Third radials nearly as wide 

 as long, quadrangular, and only about half as wide as the 

 first radials. Fourth radials a little larger than the third, 

 pentagonal in form, and supporting the arms on their su- 

 perior sloping sides. 



Anns slender, rounded and proportionally long, bifur- 

 cating first above the last radial, generally on the third or 

 fourth piece, above which each of the subdivisions bifur- 

 cate again several times. Arm pieces generally about as 

 wide as long, and not wedge-shaped. 



Proboscidiforin extension at least half (and perhaps more 

 than half) as long as the arms, entirely lateral, and not 



