﻿; D- 



SMITHSONIAN .MISCELLANEOUS COLLECTIONS 



[VOL. 47 



by the more depressed theea and more strongly sculptured plates. In 

 S. bloomfieldensis, plate 18 is much larger than in the other two spe- 

 cies, and the madreporite is therefore comparatively more con- 

 spicuous. 



Formation and locality. — The writer found this species at the base 

 of the Manlius, at Clark's Mill, near Xew Bloomfield, Pennsylvania. 

 It appears to have been a common form, as the separated thecal plates 

 occur abundantly. It 'is associated with Pseudocrinites claypolei. 



Cat. number 35,059, U. S. N. M. 



SPIOEROCYSTITES GLOBULARIS Schuchert 



(Plate XXXVIII, figures 3-5; Plate XXXIX, figures 5, 6) 

 Sphwrocystitcs globularis Schuchert, Amer. Geol., xxxn, 1903, p. 233. 

 Length of a large and regular theca 22 mm. ; transverse diameter 

 20-21 mm. Base not excavated. Plate 12 resting on plate 6 of the 

 second circle. 



23 



16 

 H f 



^§p 



M^S 



Fig. 40. — Analysis of Sphcrrocystites globularis Schuchert. 



Ambulacra branching with no apparent regularity, the branches in 

 adults varying between 9 and 14. Ambulacralia about 7 to each 

 ambulacral. 



Anal pyramid depressed, composed of 8 pieces, and surrounded by 



a ring of 4 large and 10 small 

 plates. 



Hydropore minute, closed 

 by a pyramid of 5 pieces, and 

 situated immediately in front 

 of the elongate dumb-bell- 

 Fig. 41.— Diagrams showing the number shaped madreporite on plate 



of ambulacral branches in two specimens of 21. 



5". ghbuiai-is Schuchert. Column tapering rapidly for 



a very short distance and then 

 hardly at all throughout the remainder of its length. Total length 



