wHiTBAvEs] FOSSILS OF HAMILTON FOEMATION OF ONTARIO. 375 



BoTEYOCRiNus CRA8SUS, Whiteave.s. 



Somocrinus crassux, AVliiteaves. 1887. This volume, yt. 2, (advance sheets), p. !)5 ; and 

 (1889,) pi. 12, tig. 2. 



In regard to this species Mr. F. A. Bather makes the following 

 remarks, on page 103 of his " Crinoidea of Gotland ": " This is founded on 

 a dorsal cup from the Hamilton group, which cannot, be distinguished 

 from that of a Botrijonrinus. The posterior side of the cup is not shown 

 in the figure, but Mr. Whiteaves has very kindly sent me the type 

 specimen, the evidence of which is quite clear." 



Ancyrocrinus bulbosus. Hall. 



Plate 48, figs. 8 and 'J. 



Aiu-yrorrinus bulbosus, Hall. 18G2. Fifteenth P^ep, N.Y. St. Gab. Nat. Hist., p. 118, 

 pi. 1, figs. 25 and 26. 



^Vhiteaves. 1887. This vol., pt. 2, (advance sheets) p. 10.3 ; and 

 (188!),) pi. 13, fig. 5. 



Numerous specimens of the anchor like posterior extremity of the 

 column of crinoids, which seem to agree in all essential particulars with 

 Professor Hall's description and figures of A. bulbosus, were collected at 

 Stony Point, Lake Huron, a few years ago, by the Rev. Hector Currie, 

 who has presented four of them to the Museum of the Survey. Each of 

 these specimens has four strongly developed " obliquely ascending, spine- 

 like processes," or " lateral extensions," which are rarely less than a 

 quarter of an inch and sometimes fully half an inch in length, when un- 

 broken. In two of the specioiens these processes originate at about the 

 same height and are arranged in a rather regular cruciform manner, but 

 in the other two they originate at different heights and are very irregu- 

 larly disposed. No tendency to become squareor nearly square anteriorly 

 is seen in any of them, although the axial canal of each is cruciform, as 

 \'iewed in transverse section at the anterior end, and none show any 

 indication of division into segments. 



BLASTOIDEA. 

 Plate 48, figs. 8 and 9. 



Pentremites Lpcorias, Hall. 18G.S. Sixteenth Rep. N. Y. St. Cab. Nat. Hist., p. 123. 

 " " Calvin. 1888. American G-eologLst, vol. I., p. 84. 



" Middle division of the Hamilton group about two miles south-west 

 of Widder" (Thedford), Professor S. Calvin, op. cit. According to 

 Etheridge and Carpenter, on page 132 of their Catalogue of the Blas- 

 toidea in the Geological Department of the British Museum, this species 

 may belong to the genus Granatocrinus, but it is equally probable that 



