Mahylaxd Geological Survey 241 



closely adjoining the rather large and prominent madreporite, situated, 

 as usual in Pseudocrinites, laterally between the ambulacra on the edge of 

 plate 23. 



Anal area well marked, consisting of 2 circles of plates. The outer 

 circle has 4 small plates in the right posterior comer, and these are fol- 

 lowed on the left by 3 very much smaller pieces. The latter are not readily 

 seen, and the first impression is that the 4 pieces of the right posterior 

 corner and plate 13 complete the circle. The prominent anal pyramid has 7 

 triangular pieces. Column stout, composed of thick pieces near the theca. 

 Length unknown. 



This species differs from other Pseudocrinites having ambulacra ex- 

 tending to the column, in its regularly oval outline. P. suhquadratus is 

 a much smaller species, subquadrate in outline, and with different thecal 

 sculpturing. P. elongatus is more elongate subquadrate. 



Length of largest theca 44 mm. ; greatest width 30 mm. ; depth 22 mm. 

 Length of an average specimen 30 mm.; greatest width 22 mm.; depth 

 about 16 mm. 



Occurrence. — Helderbeeg Formation, Keyser Member. Keyser, 

 West Virginia. 



Collections. — Maryland Geological Survey, U. S. jSTational Museum. 



Pseudocrinites elongatus Schuchert 



Plate XXXIV, Figs. 3, 4 



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

 No. 1482, pp. 235, 236, pi. xxxv, figs. G, 7; text fig. 31. 



Description. — Ambulacra prominent, extending around the entire 

 periphery of the theca and touching the column. As the top of the theca is 

 broken away, the exact number of brachioles cannot be counted, but, on the 

 basis of brachioles preserved and the close relationship to P. suhquadratus, 

 the total number on each side of an ambulacrum is .estimated to be be- 

 tween 26 and 28. Ambulacral groove large and deep; ambulacralia not 

 preserved. Basal pectinirhomb has about 65 dichopores, that of plates 12 

 and 18 and 75, and of plates 14 and 15 about 110. 



As the various forms of Pseudocrinites are easily recognized on account 

 of their constant characters, the writer does not hesitate to describe this 

 16 



