FOSSILS OF THE BURLIXGTOX GROUP. 437 



the body all finely granulose under a good lens. Column 

 composed of alternate thick and thin plates near its npper 

 extremity. 



Locality and position Lower division of the Burlington beds of the 

 Lower Carboniferous, at Burlington, Iowa. 



GEXUS SYXBATHOCBIXUS, Phillips, 1836. 

 STXBATHOCEI^FS TVACHSMUTHI, M. and TV. 



PL 2, Fig. 5. 

 Synbathocrinus Wachsmuthi, MEEK and WORTHEX. Proceed. Acad. Xat. ScL, Phila., 1869, p. 67. 



BODY below the top of the first radial pieces nearly 

 semi-globose, or approaching semi-oral, being about twice 

 as wide as high, and rounding to the column below. Base 

 forming one-third to nearly one-half the hight, somewhat 

 basin-shaped, and obscurely pentagonal in outline as seen 

 from below; basal pieces with the two larger divisions 

 wider than high, and hexagonal in outline, and the smaller 

 about as wide as high, and pentagonal in form. First ra- 

 dial pieces two-thirds to three-fourths as high as wide, with 

 a general quadrangular outline ; but two of those on the 

 anal side have each one of the superior lateral angles 

 slightly truncated to form a notch for the reception of the 

 first anal piece, so as to give each an additional angle. 

 Second radial pieces of nearly the same sixe as the first, 

 but not tapering upward as much as the first do downward, 

 quadrangular in outline, and generally about three-fourths 

 as long- as wide. First anal piece about half as wide as 

 long, pentagonal in form, and equaling the length of the 

 second radial pieces ; second anal piece nearly half as long 

 as the first, on the truncated upper end of which it rests, 

 trigonal in outline, the upper angle being acute. 



Arms very long and very gradually tapering, angular 

 along the middle of the dorsal side, and each composed of 

 more than thirty quadrangular pieces, that are somewhat 

 wider than long, and provided with a very deep ambulacral 



