338 PROCEEDINGS OF THE ACADEMY OF [1879. 



C. PARISOCRINUS W. & Spr. 

 (7raf>3-o? resembling, *j>7vo* a lily.) 



Calyx obconical. Differs from the last group in having two or 

 more brachials, which are short and rest within a small semicir- 

 cular scar. Mode of articulation and brandling of arms almost 

 as in Cyathocrinus. Column round, rarely pentangular. 



1858. Poteriocrinus (Parisocrinus) curtus Muller. Verb. d. nat. Verein f. Rheinl., 

 xii. p. 80, pi. 10, figs. 2, 3. Neue. Echin. Eifl. Kalk., p. 230, pi. 2, fig. 3 ; 

 Schultze, 1866, Echin. Eifl. Kalk. p. 46, pi. 5, fig. 5. Devonian. Eifel, 

 Germany. 



*185S. Pot. (Parisocr.) intermedius Hall (Cyathocr. intermedius). Geol. Rep. 

 Iowa, vol. i. pt. ii. p. 627, pi. 18, fig. 10. Keokuk litnest. Subcarb. War- 

 saw, 111. 



1861. Pot. (Parisocr.) nereus Hall. 15th Rep. N. Y. St. Cab., p. 121. Hamilton Gr. 



Devonian. Ontario Co., New York. 



1869. Pot. (Parisocr.) perplexus Meek & Worthen. Type of this group (Pote- 

 riocr.tj) perplexus). Proc. Acad. Nat. Sci Phila., p. 138. Geol. Rep. 111., 

 vol. v. p. 405, pi. 2, fig. 12. Lower Burl, limest. Subcarb. Burlington, 

 Iowa. 



1821. Pot. (Par.isocr.(l)) quinquangularis Miller (Cyathocr. quinquangularis). 

 A History of the Crinoidea, p. 92, with figures. Poteriucriniis Austin, 1843 

 Ann. and Mag. Nat Hist., vol. 10, p. 108, and vol. 11, p. 196. Rec. and 

 Foss. Crin., pi. 10, figs. 2 a-e. Subcarb. England and Ireland. 



1843. Pot. (Parisocr.) radiatus Austin. Ann. and Mag. Nat. Hist., vol. 10, p. 

 108, and vol. 11, p. 196. Rec. and Foss. Crin., p. 79, pi. 10, figs. 1 a, b. 

 Subcarb. Ireland, England, and Belgium. 



1862. Pot. (Parisocr,) salignoideus White. Proc. Bost. Soc. Nat. Hist., p. 10. 



Upper Burl, limest. Subcarb. Burlington, Iowa. 

 1861. Pot. (Parisocr.) tenuibrachiatus Meek <fc Worthen. Proc. Acad. Nat. Hist. 

 Phila., p. 138. Geol. Rep. 111., vol. iii. p. 485, pi. 16, fig. 1. Upper Burl, 

 limest. Subcarb. Burlington, Iowa. 



D. PACHYLOCRINUS W. & Spr. 

 {nra)(y\h thick, clumsy, xpTvova lily.) 



Name given to designate the comparatively short (for Poterio- 

 crinns), unusually stout aspect of the body. Calyx depressed ; 

 underbasals forming a concavity, and not extending beyond it ; 

 radials and brachials as in Scaphiocrinus, with straight hinge 

 lines and gaping sutures ; brachials generally compound. Arms 

 short, and placed closely side by side, as in Zeacrinus, also dicho- 

 tomizing in a very similar manner, but the arm joints are more 

 cuneiform and angular on the exterior. Column round or ob- 

 tusely pentagonal. Pachylocrinus is a kind of transition form 

 toward Zeacrinus and Coeliocrinas, with which it agrees in the 



