1 825 .] Journal t>f tht A tademy t>f Natural Sciences, 8^c, 311 



Cyathocrinites, atid Actinocrinites ; it contains two species given 

 to Mr. Say, by Dr. Bigsby, who has lately brought one specimen 

 of them to this country. 



1. C. ornatus. Costals, foUr pentagohsll and two hexagonal. 

 2. C. loricatus. Costal, five pehiagohal and One hexagonal. 



Mr. Say proposed a New Family should be formed for the 

 Kentucky Arterial fossil of Parkinson, which he designates 

 thus : 



Fam, BLASTOiDfiA. Column cdtiaposed of numerous articu- 

 lating segments, supporting at its summit a number of plates 

 connected, so as to form a calyciform body, containing the vicera. 

 Arms none. Branchia arranged in Ambulacree. This family 

 appears to be a link between Crioidea and Echinidce, It only 

 contains one genus, estabhshed by Mr^ Say, in Siliman's 

 Journal, called, 



1. Pentremite. Coluraii cyliridribal^ {)etforated with irre- 

 gular side arms, articulating surfaces radiated. Pelvis of three 

 Unequal species, twO pentagonal, and dne quadragonal. Scapulae 

 large, very deeply necked for the reception of the tips of the 

 radiating ambulacra, obliquely truncated at the extremities, 

 each side for the reception of one side of a subrhomboidal 

 plates, or interscapular ; Ambtilacr^fe 5. Radiating from the 

 summits, and ending at the tip of the necks of the scapula, each 

 with a longitudinal, indented, line and numerous transverse striae 

 which end in a marginal serifes of pores, for the transmission of 

 respiratory tubes (?) summits with five rounded opening (ovaries) 

 and an angulated central one (mouth and anus). 



1. Pentremite globosa. Body subglobular ; sutures with 

 parallel impressed lines. Bath, England. 2. Pentremite pyri- 

 formis. Body oblong ; pelvis gradually attenuated. 3. Pentre- 

 mate jlorealis. Pelvis ending abruptly, nearly horizontal. 

 Encrinites floreahs, Schloth. petrif. Kentucky Asterias Fossil, 

 Park, Org. Rem. ii. t. 13. Kentucky, Common. 



There are only two papers on Entomology, the first a Descrip- 

 tion of new Hymenopterous Insects, collected in the expedition 

 to the Rocky Mountains, performed under the conimand of 

 Major Long, by Thomas Say, p. 307 ; in which he describes 

 two species of Gryllus. 1 Acheta, 1 Tridactylis, 6 Pectatoma, 

 2 Cydnus, 4 Carcus, 5 Tygseus, 1 Acanthia, 1 Tingis, 1 Aradus, 

 2 Reduvius, 2 Cerixa, 8 Cicada, 1 Tulgera, 2 Plata, 1 Delphax, 

 2 Ceriopis, 7 Tettigonia ; but for the description of them, we 

 must refer to the work itself. The second paper in this depart- 

 ment is a Description of a New Species of Trilobite. By J, J. 

 Bigsby, MD. p. 365. Found at Lockport, New York, and 

 named after Lieutenant Bolton, of the Royal Engineers. 



Paradoxus Boltoni, t. 23. Oval blind ; surface with small 

 tubercles, and striae ; clypeus rounded before ; exterior angles 



