FOSSILS OF THE BURLDsGTON GROUP. 371 



both of the superior lateral angles a little truncated, so as 

 to present an irregular pentagonal or hexagonal outline. 

 Third radials sometimes a little smaller, and in other rays 

 a little larger than the second; all pentagonal, and (except- 

 ing in the anterior and one of the anterior lateral rays of 

 the typical specimen) each supporting on each of its su- 

 perior sloping sides, in- direct succession, two secondary 

 radials generally of near its own size, the upper ones of 

 which are also axillary pieces, and bear on each of their 

 superior sloping sides two brachial pieces in direct succes- 

 sion (the last of which is generally larger than the first), 

 thus making four arms to each of these rays. In the an- 

 terior ray. however, the third radial merely bears on each 

 side, above, three brachial pieces in direct succession, and 

 the same is also the case on one side of one of the anterior 

 lateral rays, thus only giving origin to two arm openings 

 in the first, and three in the latter, making seventeen arm 

 openings to the entire series. First anal of the same size 

 and form as the first radials, excepting that it is propor- 

 tionally a little longer; above this there are three smaller 

 pieces in the second range, three in the third, and two or 

 three in the fourth. First interradials of the same size as 

 the second aiials, hexagonal or heptagonal in form, and 

 supporting two smaller pieces in the third range, with two 

 to three or four still smaller pieces above, the upper one of 

 which, like that of the anal series, separates the brachial 

 pieces a little, so as to form a small sinus between the arin- 

 liases belonging to each ray. 



Vault slightly veiitricose, composed of very irregular, 

 unequal, merely tumid pieces, and provided with a rather 

 >tmit. nearly central proboscis, which is inclined a little 

 forward in the typical specimen. 



The specific name is given in honor of Mr. S. A. CASSE- 

 DAY, deceased, the author of the genus Batocrinus. 



Hight of body to arm-b;ts<->. 0.70 inch; do. to base of 



