30 Talbot— New York Helderbergian Crinoids. 



of such joints as made of two, in this agreeing with Bather's 

 explanation. The specimens under examination, although one 

 is very well preserved, do not give the faintest trace of the 

 separate joints ; yet this explanation for the presence of the 

 additional pinnules seems to be the most rational one yet 

 offered. 



Of the whole number of specimens examined, only one 

 shows the anal tube mentioned by Hall. This tube is seen 

 indistinctly in the photograph (pi. Ill, fig. 4; also text-fig. 

 3). The length of the tube is a little over half that of the 

 crown. 



Horizon and locality. — Upper third of the Coeymans lime- 

 stone at Jerusalem Hill and at North Litchfield. 



Cotypes in the American Museum of Natural History. 



Order, Aiiticulata Wachsmuth and Springer. 



Suborder, Impinnata Wachsmuth and Springer. 



Family, Ichthyocrinidae Wachsmuth and Springer. 

 Genus, Ichthyocrinus Conrad. 

 Ichthyocrinus schucherti n. sp. Plate III, figure 1 ; text-figure 4. 

 Specific description. — Crown, including the incurved arms, 

 an inverted, truncated cone with straight sides. Length and 

 breadth equal, 19 mm , the greatest breadth 

 being at the point w r here the arms become 

 free. Infrabasals not shown. Basals five, 

 pentagonal. Radials five, hexagonal, wider 

 than long. Costals three in each ray, wider 

 than long, one hexagonal, the other two pen- 

 tagonal, the upper supporting two rows of 

 distichals, the first three ranges of which 

 are quadrangular and the last pentangular 

 and followed by two rows of palmars. The 

 palmars are of different numbers in the dif- 

 ferent rays and even in different parts of the 

 same ray. Two or three of the palmars are 

 included in the cup. Each costal and each 

 Text-figure 4.— Dia- distichal is wider than the plate of the same 

 gram of ichthyocrinus 0Y ^ eY b e i ow it but in the palmars there is a 



schucherti. -, • xi • £ xi i ±. 



decrease m the size oi the successive plates. 

 Anal area not shown. Arms free from the second or third 

 palmar, incurved. Each row of palmars divides at least once, 

 making the number of branches forty. Column spreading 

 slightly at the point of union with the crown. Joints of the 

 column thin and equal near the calyx, alternating below, the 

 larger ones about three times as high as the smaller. Length 

 of column unknown. 



