NO. 1192. TEENTON FAVN A OF BAFFIN LAND— sen UCHERT. 153 



circumference, making the species originally not less than 12 inches 

 over all. This is about the usual size for the larger specimens of B. 

 oweni in Minnesota, although examples have been seen 20 inches in 

 diameter. 



Etheridge has described U. arcticus from Cape Frazer and Cape Louis 

 Kapoleon in Grinnell Land. This is also a large disk-shaped species, 

 similar in growth to E. oweni, but the walls are usually twice as thick, 

 and the transverse tubes are much larger and fewer in a given space 

 than in the species last named. 



Collectors. — J. N. Oarpender, A. H. White, and A. Y. Shaw. Oat. 

 No. 28143, U.S.N.M. 



ISCHADITES lOWAENSIS (Owen). 



Selenoides ioivensis Owen, Geol. Surv. Wis., Iowa, Minn., 1852, p. 587, pi. 2B, fig. 13. 

 Ischadites iowensis Winchell and Schuchert, Geol. Minn., Ill, Pt. 1, 1893, p. 64, 

 pi. F, iigs. 5, 6. 



A well-preserved fragment of this species is identical with specimens 

 from Goodhue County, Minnesota. 



Collector.— J . N. Carpeuder. Cat. No. 28144, U.S.N.M. 



Class OCELElNrTER^T^. 



Order ALCYONARIA Ed\vards and Haime. 



Family HALYSITID^. 

 HALYSITES CATENULATUS, var. GRACILIS Hall. 



Halysites catenularia var. gracilis Lambe, Geol. Surv. Canada, Cont. to Canadian 

 Pal., ^Y, 1899, p. 69, pi. in, figs. 5-7. 



Of this widely distributed species, which begins in the Trenton and 

 dies out in the Lower Helderberg, there are several excellent specimens 

 present. These Arctic Trenton specimens are in harmony with the 

 YSkv\&tj gracilis, which is restricted to the Trenton and Lorraine stages. 



Collectors. — J. N. Carpender, A. H. White, and A. V. Shaw. Cat. 

 No. 28138, U.S.N.M. 



Family HELIOPOEID^ Moseley. 



LYELLIA AFFINIS (Billings). 



For synonymy see Lambe, Geol. Surv. Canada, Cont. to Canadian Pal., IV, 1899, 

 p. 84. 



This species, of which there are in the present collection three well- 

 preserved examples, Mr. Lambe says occurs in the "Hudson Eiver and 

 Niagara formations, in the four divisions of the Anticosti group, and 

 in the Lower Helderberg group." To this range is now added the 

 Trenton stage. 



Collectors.— J. N. Carpender and A. V. Shaw. Cat. No. 28139, TJ.S.N.M. 



