240 Systematic Paleontology 



arranged in short crescents, and outside of these by a single row of much 

 larger, strongly elevated plates, each one of which is as large as two of 

 the ambulacrals. Basal pectinirhomb with about 60 dichopores, that of 

 plates 12 and 18 with 80, and of 14 and 15 -wdth 90. Madreporite quite 

 large for Pseudoerinites, but the hydropore is exceedingly minute. Anal 

 area small, composed of 2 circles of plates; the outer has 7 nodose pieces 

 and the inner depressed pyramid has the same number of plates. Column 

 slender. Its length is unknown. 



This species is readily distinguished from all other Pseudoerinites by 

 the strongly stellate sculpturing of the plates. P. gordoni differs further 

 in having many more brachioles. 



Length of a large specimen 25 mm.; breadth 23 mm.; depth about 15 

 mm. Mr. Hartley has a specimen 32 mm. long and 30 mm. wide. 



Occurrence. — Heldeuberg Formation, Keyser Member. Keyser, 

 West Virginia. 



Collection. — U. S. National ]\Iuseum. 



Pseudocrinites CLARKi Schuchert 



Plate XXXIII, Figs. 15-18; Plate XXXV, Fig. 14 



Pseudocrinites clarJci Schuchert, 1903, Amer. GeoL, vol. xxxii, p. 237. 

 Pseudocrinites clarki Schuchert, 1904, Smith. Misc. Col., vol. xlvii, pt. ii, 

 No. 1482, pp. 233, 234, pi. xxxvi, figs. 4-7; pi. xxxix, fig. 14. 



Description. — Ambulacra in mature specimens very prominent, tri- 

 angular in transverse section, extending around the entire periphery of the 

 theca and touching the column. In the second largest individual each 

 ambulacrum had about 44 brachioles, in another mature but smaller speci- 

 men there were only 32. Brachioles unknown, apparently more slender 

 than in P. gordoni. Ambulacral grooves narrow, and covered by highly 

 elevated ambulacralia of about the same nature as in P. gordoni, but less 

 numerous and the larger plates more nodose. 



Basal pectinirhomb in the specimen of average size above mentioned, 

 with about 42 dichopores, that of plates 12 and 18 with about 50, and that 

 of plates 14 and 15, which is the largest, with about 68. In the largest 

 specimen there are as many as 120 in a rhomb. Hydropore minute and 



