40 



and with a good lens the stria? are seen to consist of rows of minute 

 granules. 



Dedicated to Mrs. Orestes St. John, by whom this fine specimen 

 was discovered, and to whom I am indebted for the use of it. 



Position and locality: Upper coal measures, Shawnee county, 

 Kansas. 



AETICLE III. 



Descriptions of two new species of crinoidea from the Chester 

 limestone and coal measures of illinois. 



By Charles Wachsmuth. 



allagecrinus carpenteri. n. sp. 



The' unique specimen upon which this species is founded is from 

 the collection ot Prof, Wortheii, who kindly permitted me to describe 

 it. It is partly imbedded in the rock, but only a small portion is 

 covered by the matrix. It consists of a two-inch column, the calyx 

 and arms. The calyx is somewhat pressed out of shape, but with 

 this exception is excellently preserved. The specimen is small, its 

 length measuring from the basal disk to the tips of the arms, 80.100 

 parts of an inch, to the arm bases, 16.100 parts, of which the basal 

 disk occupies only 4.100 parts. 



Specific Diagnosis: The calyx is of small size, the form is cylin- 

 dro-conical ; it is composed of two rings of plates, the upper sup- 

 porting the arms. There are no inter-radials, and no azygous side. 

 Plates strong, without ornamentation. 



Basal disk undivided, at least without visible suture lines ; it is 

 short, three' times wider than high, saucer-shaped, — the upper side 

 but little wider than the bottom part, with very obtuse upper angles. 



Piadials 1x5, dilfering somewhat in width, — wider at the top, — 

 their length one-half to three quarters greater than their width, 

 quadrangular in outline, but actually pentangular ; axillary, with 

 very obtuse upper angles, the sloping sides slightly excavated and 

 supporting the free arms. 



Arms two from each ray, simple throughout, unequal in size, — 

 some of them one-half thicker than others, — not tapering; 

 nearly as thick at the distal end as at the base. The arms are con- 

 structed of from eight to ten simple joints, the first joint one-half 

 higher than wide, and differing from the others by being flattened at 

 the dorsal side, all succeeding ones rounded at the outer side, with 

 slightly expanded ends ; upper and lower sides almost parallel. The 

 length of the joints is somewhat irregular, varying from three to 

 four times their width, but in proportion to the width of the arm ; 

 ventral groove wide and deep. No pinnules have been observed, 

 and the construction of the vault is unknown. 



Column circular, very strong at the basal dislc, but tapering so 

 rapidly in its course downward that at about one-fourth of an inch 



