No. 7.] WHITEAVES — JURASSIC FOSSILS. 403 



5. Inoceramus (?) Falls of the Iltasyouco River, a frag- 

 ment only of a species with wide, rounded, concentric folds. 

 Mr. Dawson made a rough sketch of the specimen as it originally 

 appeared in the rock, and, judging by this, the shell appears to 

 have been very similar to the Inoceramus venustus, Sowerby, of 

 the English Lias. 



6. Eumicrotis curta (?) Meek & Hayden. Iltasyouco River, 

 two imperfect right valves, both marked with distinct raised 

 lines. Almost certainly indentical with Monotis substriata, 

 Munster, as suggested by Meek. Stoliczka has shown that Bey- 

 rich's generic name Pseudomonotis has two years' priority over 

 Eumicrotis Meek, so that the name of this shell ought probably 

 to be written Pseudomonotis substriata, Munster, Sp. 



7. Pteroperna (?) Two specimens of a smooth, oblique and 



elongated species of Pteroperna, with a long and deeply emarg- 

 nate posterior wing, both from the Iltasyouco River ; probably 

 new to science, but not in a sufficiently good condition to be pro- 

 perly characterized. 



8. Pinna subcancellata, N. Sp. — Shell moderately convex, 

 wedgeshaped, elongated : squarely truncate behind, or nearly so ; 

 hinge line straight ; ventral margin also straight for the greater 

 part of its length, but rounded at its junction with the posterior 

 end. Surface marked by coarse, irregularly and unequally dis- 

 posed concentric plications, which, in the upper two-thirds of the 

 shell, are crossed by about eighteen radiating, but nearly longit- 

 udinal raised lines. The amount of convexity of the valves 

 cannot be precisely defined, as the only specimen yet obtained is 

 distorted by pressure. Falls of the Iltasyouco River, a solitarj 

 example with both valves in situ. The beaks are broken off, 

 but the sculpture of both sides of the fossil is well shown. Per- 

 haps only a variety of Pinna Rartmanni, Zieten, from which 

 it differs in being more squarely truncated at the anal end, and 

 in having the radiating costae confined to the upper two- thirds 

 of the shell. 



9. Modiola formosa Meek & Hayden. One very good speci- 

 men from Sigutlat Lake. Very near to M. cancellata, Goldfuss. 



10. Modiola pertenuis, Meek & Hayden. Three left valves 

 of a small, smooth Modiola, (two from the Iltasyouco River, 

 the other from Sigutlat Lake), one of which appears to bo 

 a distorted but otherwise tolerably typical example of M. per- 

 tenuis, while the two others are probably only a short, broad 



