72 



distinct subsquamose concentric striae, of whicli there are from six to ten 

 in the -width of one line. Length of largest specimen seen, 7 lines ; width, 

 6^ lines. Another specimen is 5-^- lines in length, and 5^ in width. 



Fig, 64. 



Fiar. 65. 



Fig. 64. — Lingula Irene. — a. Specimen found in a boulder of magnesian limestone 

 near Montreal, supposed to be from the calciferous sandrock ; 

 b. Specimen from the graptolitic slates, Point Levis. 



Fig. 65. — L Quebecensis. — Three specimens of different sizes. 



The specimens in the slate at Point Ldvis are usually pressed quite flat, 

 but some of them show a considerable amount of convexity in the upper 

 half. A single valve from the Calciferous sandrock at the eastern end of 

 the Island of Montreal is rather strongly convex, especially on the umbo. 

 It is 7 lines in length, and 6^ in width, its proportions, contour, and sur- 

 face characters being precisely like those of the largest specimen from 

 Point L^vis. 



This resembles L. curfa of the Trenton limestone and Utica slate, but 

 is proportionally broader. 



Locality and Formation. — Point L^vis ; in the graptolitic slates of the 

 Quebec group. A specimen not distinguishable specifically from those of 

 Point L{3vis was found by Mr. Ramsay in a boulder of the Calciferous 

 sandrock near the city of Montreal. 



Collectors. — Mr. Ramsay, J. Richardson, J. Weston. 



Lingula Quebecensis. (N. sp.) 



Fig. 65. a, b, c. 



Description. — Shell large, elongate-oval ; extremities nearly equal 

 front margin narrowly and uniformly rounded ; sides very gently convex 



