302 CONTRIBUTIONS TO CANADIAN PALEONTOLOGY. 



Palieontology of the State of New York. The present species, however, 

 may readily be distinguished from JV. varicosa, by its mucli smaller size, 

 more trapezoidal contour and by tlie apparent absence of " strong varices 

 of growth.'' 



NUCULITES, Sp. 



Plate 39, lig. 4. 



An imperfect cast of the interior of a single valve of a small and appa- 

 rently undescribed sjaecies of JViirulites was collected by Mr. J. B. Tyrrell 

 and the present writer in 1888, on the north shore of Manitoba Island. 

 The specimen, which is not more than five millimetres in length, is too 

 imperfect for specific description, but it shows clearly the impression of 

 the "vertical clavicular ridge just anterior to the beaks," which is so 

 characteristic of the genus. The general contour of this specimen is not 

 very dissimilar to that of the JV. ohlo'iKjata of Hall (from the Hamilton 

 group of the State of New York), but that species attains to a length of 

 from twenty-four to thirty-five mm., and is much more obtusely pointed 

 at the longer and so-called posterior end. 



(S.) Kefeesteinia subovata. 



Mei;alo<lon nnhovatii,'<, Whiteaves. 1890. Trans. Royal ,Soo. Canada, vol. VIII, 

 Sect. 4, p. 97, pi. v., figs, i, 2a, .3 and ,3a. (Separate copies.) 



Cameron Bay, Lake Winnipegosis, on the south-west side, three miles 

 south of Graves Point (one small cast) ; Dawson Bay, in the same lake, 

 on Beardy Island (one small cast), on the south-west shore, two miles 

 west of Salt Point (six specimens), four miles west of that point (several 

 specimens, some with the test preserved), and a few miles farther west, 

 at the first small point east of the mouth of Steep Rock River (four large 

 casts) ; also on the west shore, at the mouth of the Red Deer River (two 

 specimens) : J. B. Tyrrell, 18.S9. 



A left valve of a small bivalve shell from Pentamerus Point, Lake 

 Manitoba, and a cast of the interior of both valves of an equally small 

 specimen from Onion Point, on the same lake, both collected by Mr. 

 Tyrrell and the writer in 1888, are probably immature examples of this 

 species. 



K. nuhovtUa was originally " referred to the genus J//'c/aIodov, on account 

 of its strong resemblance in internal structure to the M. /runrafun and 

 jV. rhoinhoidalis of Goldfuss, from the Devonian rocks of the Eifel." It 

 was, however, stated (op. cit. pp. 97 and 98) that, in each of these shells 

 the "hinge seems to be constructed on ,-i sdmewhat different plan to that 



