Marylaxd Geological Survey 345 



Basal pectinirhomb and that on plates 12 and 18, each with about 75 

 dichopores, and that on plates 14 and 15 with about 110. Madreporite 

 larg-e and the hydropore immediately in front of it somewhat larger than in 

 Pseudocrinites. Both are situated on plate 23. Anal pyramid composed 

 of 7 pieces, and surrounded by another circle of larger pieces of which there 

 appear to be 7 or 8. The anal area lies between plates 7, 8, 13, and 14. 

 Column very stout. Length unknown. Length of theca 35 mm. ; width 

 26 mm. ; depth 20 mm. Base of theca deeply excavated and occupied by a 

 stout column. 



Occurrence. — ^Helderbekg Formation, Keyser Member. Keyser, 

 West Virginia. Just below Gypidula zone. 



Collection. — U. S. National Museum. 



Subfamily CALLOCYSTINAE 



Genus SPHy^ROCYSTITES Hall 



Spii^rocystites multifasciatus Hall 

 Plate XXXIV, Figs. 11, 12 ; Plate XXXV, Figs. 1-4 



Spharocystites multifasciatus Hall, 1859, Pal. N. Y., vol. iii, p. 130, pi. 7o 



figs. 1-4, 1861. 

 Spluvrocystis -multifasciatus Haeckel, 1896, Beitr. Morph. u. Phyl. d. Echino 



dermen, p. 133. 

 Spharocystites multifasciatus Jaekel, 1899, Stammesgeschichte der Pelmato- 



zoen, i, p. 289. 

 Sphwrocystites multifasciatus Schuchert, 1903, Amer. Geol., vol. xxxii, p. 233, 

 Sphmrocystites multifasciatus Schuchert, 1904, Smith. Misc. Col., vol. xlvii, 



pt. ii, No. 1482, pp. 250, 251, pi. xxxviii, figs. 1, 2; pi. xxxix, figs. 1-4; text 



figs. 38, 39. 



Description. — Ambulacra 4, branching rapidly and with no apparent 

 regularity, the branches varying from 14 in the youngest to 27 in the 

 largest theca. These spread between and around the anus and pectini-' 

 rhombs until the greater portion of the thecal surface is occupied by them, 

 obscuring the suture lines between the thecal plates. Brachioles widely 

 separated, about 3 in 5 mm. ; club-shaped, tapering to a point, and about 

 3 mm. long. Ambulacrals large, to each of which there are about 5 

 ambulacralia. Dichopores in sharply delimited, low, angulated, discrete 

 pits ; in other Mords, the grooves of the 2 parts of the pectinirhombs do not 



