122 



Scientific Intelligence. 



Column. — No trace of an aperture or articular facet exists at the base 

 to indicate that the genus possessed a column. 



Eleutherocrinus Cassedayi. Nov. sp. — The body of this species is 

 of an ellipsoidal form, truncated at summit, sub-triangular below, and 

 flattened on that portion of the circumference occupied by the large 

 basals and short radial. The surface of all the principal pieces is marked 

 with numerous delicate striae, slightly flexuous and running in a direction 

 nearly parallel with the edges. 



Basal pieces. — The outer long ones descend lower than the middle pair 

 and the extremities of their pseudoambulacral fields are nearer the infe- 

 rior extremities of the pieces. Their internal limb is narrow, lanceolate 

 and obliquely truncated above ; the external one is broadest, obtusely tri- 

 angular, and bent backwards nearly at right angles, to unite with the 

 long basals and short radial, forming with these a flattened convex sur- 

 face, whose transverse diameter equals' the total width of the calyx. The 

 middle pair, or those standing over the small basal, are more regular in 

 form than the outer ones, their branches narrow and equal. The internal 

 edges of all the branches of the long radial pieces are limited by a fine 

 carina, terminating below in a triangular projection, on which rest the 

 extremity of a pseudoambulacral field. The lateral sutures are also 

 marked by a fine carina. The short radial piece is sub-pentagonal and 

 angulated in the middle ; its length and breadth about equal. Below it 

 rests by a double concave edge on the extremities of the long basals ; 

 the lateral edges are arched, the outline of the superior edge somewhat 

 V-shaped. 



Interradial pieces. — The three regular ones are swelled and rounded at 

 the apex, and terminate below in three salient angles ; the lateral edges 

 are strongly crenulated. The irregular pieces are situated on either side 

 of the short radial. They are scarcely more than half the width of the 

 others, and only one of the lateral edges is crenulated. 



Pseudoambulacral areas. — The four linear areas are convex, and pro- 

 ject above the plane of the interradial plates. The pore pieces are trans- 

 verse, sub- pentagonal and finely crenulated at their internal edges. Their 

 surfaces are deeply indented, and their number on each side of a field 

 amounts to about thirty-five. The supplementary pore peices are sub- 

 triangular and very minute. The fifth or anomalous area is small, trian- 

 gular, and situated on the summit plane just within and a little below the 

 superior edge of the short radial piece. The pore pieces are transverse, 

 wide, and amount to about seven on each side of a field. Their form 

 and that of the supplementary pore pieces cannot be well made out in 

 the specimens on hand. The apertures situated at the extremities of the 

 pieces amount to about fourteen for the entire field. 



The Eleutherocrinus Cassedayi is the only known species of the genus. 



[A fine lithographic plate of this species is given in the Proceedings of 

 the Philadelphia Academy, from which the description is here cited.] 



5. Reptilian remains in the Neiv Red Sandstone of Pennsylvania ; by 

 J. Lea, (Proc. Acad. Sci., Phil., viii, 11, March, 1856.) — Mr. Lea read 

 some notes from a paper he is preparing for the Journal of the Academy 

 on the New Red Sandstone formation of Pennsylvania, and stated that 

 he had, during an excursion last summer, found in the dark shales of 



