1881.] NATURAL SCIENCES OF PHILADELPHIA. 235 



■ 1861. Cordylocr. plumosus, Hall. (Platycr. plumosus.) Pal. New York, iii, p. 



113, PI. 4, figs 1-5. Lower Helflerberg. Herkimer Co., New York. 

 *1861. Cordylocr. ramulosus, Hall. (Platycr. ramulosus. Pal. New York, iii, p. 



115, PI. 4, figs. 10-13. Lower Helderberg. Herkimer Co., New York. 



3. CULICOCRINUS Job. Miiller. 



1855. Joh. Miiller. Verb. Naturh. Verein Rheinl. xii, p. 23. 

 1855. F. Roemer. Lethsea Geogn. Ausgabe iii, p. 243. 

 1879. Zittel. Handb. der Palseont., i, p. 367. 



Syn. Platycrinus Wirtgeu and Zeiler, 1855. Verb. Naturb. Verein, 

 p. 15. 



Miiller proposed Culicocrinus merely as a subgenus of Platy- 

 crinus^ a distinction which seems to us scarcel}^ in proportion to 

 the differences apparent between the two forms, and we therefore 

 propose it as a genus. Zittel even places it with Briarocr'inus 

 under a separate family. Protoeryale confluentina, Roemer (Yerh. 

 Naturh. Yereins, xii, p. 29, PI. 9, figs. 2, 3), is according to Miiller 

 probably identical with Gulicocr. nodosus. 



Generic Diagnosis. — Body elongate ; calyx higher than wide ; 

 basals and first radials heavy and nodose ; symmetry almost per- 

 fectly pentahedral. 



Basals three, large ; two of them equal, pentagonal, the third 

 smaller by half and quadrangular ; sutui-es very distinct. They 

 form a pentagon, the central part excavated for the reception 

 of the column; separated from the radials by a deep groove. 

 Primary radials 3X5; the first large, tuberculous, quadrangular 

 in outline but in fact hexagonal, owing to the slight truncation 

 of the upper corners adjoining the interradials ; the second about 

 quadrangular, narrower than the first, veiy short, and three or four 

 times wider than high ; the third vaiying in form and size, but 

 generally triangular. The latter plates mostly occupy only the 

 median portion of the margin of the second radials, in which case 

 the outer ends of those plates aid in supporting the secondary 

 radials ; sometimes, however, they fill the entire width of the 

 second primaries, and the secondary plates rest wholly upon the 

 sloping sides of the triangular pieces. Secondary radials 1 X 10, 

 generally wider than high, supporting two arms to the ray. 



Arms stout, attached laterall}' up to the second or third joints, 

 above which at some distance they branch. They are from the 

 base up composed of two rows of joints, alternately arranged, and 

 meeting by zigzag sutures. 



