72 



distinct subsquamose concentric striae, of which 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 5J- lines in length, and 5 in width. 



Fig. 64. 



Fig. 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 LeVis are usually pressed quite flat, 

 bmt 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 6J in width, its proportions, contour, and sur- 

 face characters being precisely like those of the largest specimen from 

 Point Le"vis. 



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

 Is proportionally broader. 



Locality and Formation. Point LeVis ; in the graptolitic slates of the 

 Quebec group, A specimen not distinguishable specifically from those of 

 Point LeVis 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 ; 



