32 



■ of the convexity. One of the. specimens examined is thirty- four lines 

 wide on the hinge-line ; twenty-five lines in length in a straight line from 

 the beak to the front ; thirty lines in length, following the curve of the 

 dorsal valve, abruptly bent or geniculated at about fourteen lines from 

 the beak, at an angle of about 120^, the most elevated point is twelve 

 lines above the plane of the lateral margin. Another is twenty-six lines 

 wide on the hinge, and, at about twelve lines from the beak, is abruptly 

 bent at a right angle, and the extended forwards about twenty lines. 

 The greatest elevation of this specimen is about twelve lines. From 

 these highly convex forms to those nearly flat there is a gradual passage. 



Variety. 



The specimens, to which the above description relates, occur in Div. 1, 

 of the Gaspe limestones. In the upper part of the series a variety occurs 

 with fine thread-like radii, between every two of which there are from 

 three to five much finer, apparently from twelve to sixteen in the width 

 of two lines. This may constitute a distinct species, but the specimens 

 as yet collected are not sufiiciently perfect to decide that point. 



I have compared the above with specimens of S. euglypha^ both 

 from Sweden and England, and consider them to be distinct species, 

 although closely related. 



Locality and Formation. — S. punctulifera occurs between Cape 

 Rosier and Cape Gasp^, in the Gaspe limestones, Div. 1, where it appears 

 to be common, but not well preserved. Also, rarely, in Div. 8. The 

 " Variety has only been found in Div. 8, at Indian Cove, Grand 

 Gr^ve, &c. 



Collectors. — Sir W. E. Logan, R. Bell. 



There are evidently several other species of Strophomena in the Gaspe 

 Rocks, but the specimens as yet collected are not sufficiently perfect to 

 admit of description. One of them appears to be S. perplana, Conrad. 



Orthis Livia. (Billings.) 



Ortkis Livia, (Billiags), Canadian Journal, vol 5, p. 267, May, 1860. Figs. 14, 15, 16. Geol, 



of Can., p. 369, fig 385 a,6, c. 

 (Hall) Pal. N. Y., vol. 4, p. 38, pi. 5. 



Description. — Sub-orbicular or sub-quadrate ; length about eight-ninths 

 of the width ; greatest width, usually a little in front of the middle ; length 

 of hinge line, one half to two-thirds the width of the shell ; cardinal ex- 

 tremities rounded; sides in most specimens somewhat straight, often suf- 

 ficiently curved to give a circclar aspect to the shell ; froat angles obtusely 



