301 



Invo. 



Involuti?ialobata^Enf^liBh. Comp. Endothyrabaileyi. XL 



Iphidea bella. (Billings, 1872, Can. Nat. Vol. 6, 477 ; 1874, 

 Pal. Foss. 2, pt. 1, p. 76,) Wolcott, Bull. U. S. G. 



MC i rJ.7* S. No. 30, page 100, plate 7, fig. 4, copy of Bill- 

 ings' original figure ; ventral (?) valve. — Lower 

 Cambrian^ in Canada below Quebec; in L'Anse 

 au Loup limestone Belle Isle Straits, etc ; not yet 



in Vermont, New York, or Rocky mountains. Z. (7. 



Isis ? (Coral.) Hall, Plate fig. [24, 2, 3.] F, b. 



H.43.3, 



Isotelus canalis, Conrad. (Hall's Palaeon. N.Y.Vol. 1, 1847, 



Trenton and LLudson river groups.) Emmons, Am. Geol. 1855, 

 I, ii, 236, plate 3, figs. 17, 18, 19. The margin of the shield of 

 this trilobite is traversed by a rather deep furrow. Figs. 17 and 

 19 were found by Dr. Emmons in the Calciferous sandstone 

 {LL a^) at Chazy in northern New York ; in 17, only the margin 

 has been preserved from erosion. — Reported by C. E. Hall 

 from the Calciferous in Nittany Valley, Pa. ; from the Chazy 

 in Kishicoquillis Valley, Mifflin Co., Pa. ; and from the Trenton^ 

 in Nittany Valley. (Proc. A. P. S , Jan., 1876.)— //a, 5, c. 



