PLATYCRINID^. 737 



Cordylocrinus phimosus (Hall). 

 Plate LXXV. Fig. 20. 



1859. Flaiycrinus flumosus — Hall; Palaeont. New Yoi-k, Vol. III., p. 113, Plate 4, Pigs. 1 to 5. 

 18S1. Cordi/locrimis plumosiis — W. and Sp. ; Revision, Part II., p. 60 (Proceed. Acad. Nat. Sci. Pliila., 

 p. 234). 



Sjn. Platucrinus parvus — Hall; Pateont. New York, Vol. III., p. 114, Plate 4, Figs. 6 to 9. 



Sjn. Cordi/locrbiits parous — W. and Sp, ; Revision, Part II., p. 60. 



A small species. Dorsal cup siibpentangiilar, expanding to the arm 

 bas«s ; surface of plates finely granulated. Basals very thin, wider than 

 long, the column facet small. Eadials excavated for the reception of the 

 costals. The three radials meeting an interbasal suture distinctly angular 

 at the lower end, the two others nearly straight. The upper faces of those 

 adjoining the anal side forming a deep notch, occupied by a large pentan- 

 gular plate, which is succeeded by a smaller plate forming the base of a 

 proboscidiform tube (Hall, Plate 4, Fig. 3). Costals two. Arms two to the 

 ray, composed of transverse, slightly wedge-form pieces, giving off large 

 pinnules, which are not in contact laterally. Column composed of nodal 

 and internodal joints, the latter rapidly increasing in number, the nodal 

 joints giving off whorls of cirri, one to each side, interradially arranged. The 

 cirri are formed of short pieces ; they are filiform and directed upwards, 

 often so long that the tips of the proximal ones pass up to the top of the 

 arms. 



Horizon and Locality. — Lower Helderberg group; Schoharie, Herkimer 

 Co., N. Y. 



Remarks. — We have not examined Hall's types, but doubt if they show 

 much more of the structure. The form which Hall described as Platycrinus 

 farmis is in our opinion a younger form of Cordylocrinus jplumosus. 



(?) Cordyloeriniis ramulosus (Hall).* 



183S. Plati/mnus ramulosus — Hall; Palseont. New York, Vol. III., p. 115, Plate 4, Figs. 10 to 13. 

 1881. Cordi/locrinus ramulosus — W. and Sp. ; Revision, Part II., p. 60 (Proceed. Acad. Nat. Sci. Pliila.,' 

 p. 234). 



Dorsal cup small. Basals wider than long. Radials comparatively large, 

 wider thaii long, very prominent below the facets, and contracted toward 

 the upper lateral angles. Costals two, very small. Arms bifurcating from 



* This species may belong to a very different group. It was apparently described from very imperfect 

 specimens, and not having seen the types, we give Hall's description with our terminology. 



