368 



AXNAI.S OF 'IHK CaRNKGIE MuSK.UM. 



A single specimen obtained from an almost barren layer of gray- 

 dolomite in the reef at Smuggler's Bay, Valcour Island, proves to be 

 identical with Cheiruri/s viilcaniis Billings, from Division C of the 

 Quebec Grouj), Cow Head, Newfoundland. Chcinints prolificiis 



Fig. io. Piendosphxrexochusvulianus\i\\X\x\^%. Reproduction of Billings' figures 

 in volume I of the Paleozoic Fossils of Canada. The associated pygidium may be- 

 long to a Lic/ujs. 



Billings seems to be the same as Cheirun/s viiha)ius, and Clieinirus 

 Mercitriiis Billings is another closely allied species, with, perhaps, suf- 

 ficient difference in the character of the posterior glabellar furrows to 

 allow it to retain its specific name. 



Description*. 

 Cephalon wide, the glabella very large and convex, the cheeks 

 drooping. Glabella wide, convex, tapering very rapidly toward the 

 front. There are three pairs of glabellar furrows, the first ])air short, 

 running a little forward, at first, and then backward ; the second pair 

 longer, running in almost perpendicular to the axis a short distance, 



Fio. II. Psendos.phiTre.xochi(s vtihanus, liillings variety lilliiigsi. Reproduced 

 from Billings' figures in Paleozoic Fossils of Canada. 



then turning backward, and then forward again, in a sigmoid curve. 

 The last pair run backward and upward and when nearly to the sum- 

 mit of the glabella, turn backward, and, by a very slight depression, 

 connect with the neck furrow. Fixed cheeks small ; free cheeks rela- 



