«H.TE*VE8 J CRETACEOUS FOSSILS FROM MANITOBA. l85 



0. FEOM MANlTOBA^i^. 



From the JSTiobrara-Benton Formation of the Later Cretaceous 

 IN THE Duck and Riding Mountain District. 



VERMES. 



Serpula semiooalita. (N. Sp.) 

 Plate 26, flgl. 



Tubes subcylindrical, a little broader than high, attached by their 

 bases to some foreign object, increasing very gradually in size, irregu- 

 larly curved but apparently never spirally coiled, and growing for the 

 most part in very closely aggregated groups. The tubes often cross 

 each other, and in those places where they either run parallel to or 

 are in Contact with each other in the same plane, two, three, four, or 

 more, are not unfrequently united or anchylosed together. Upper 

 surface nearly smooth, marked only by a few irregularly disposed and 

 transverse lines of growth. 



Length unknown ; average transverse diameter, three millimetres. 



Vermilion Eiver, Township 25, Range 20 W.j : two specimens. Swan 

 River, Township 35, Range 29 W. : one specimen. All three from the 

 Niobrara group, or upper part of the series. 



MOLLUSCOIDEA. 



BBACHIOPODA. 



LiNQULA subspatulata (?) Hall & Meek. 



Lmgvla subspatulata, Hall & Meek. 1856. Mem. Am. Ac. Arts & Sciences, 

 Cambridge, vol. V., p. 380, pi. 1, figs. 2 a, b. 



Rolling Eiver, Township 35, Range 26 W., J. B. Tyrrell, 1887 : one 

 imperfect valve and a fragment of another, on a small piece of sand- 

 stone from the base of the Fort Benton group, or lowest beds of the 

 series. 



The moie perfect of these two specimens is in almost exactly the 

 same condition as the type of L. subspatulata, the shell in both being 



• Mr. Tyrrell, who is at present engaged in making a geological examination of this region, 

 states that although the rocks there seen are precisely similar to those described by Messrs. 

 Meek and Hayden in Nebraska as Nos. 3 and 2 of their typical section, they are so intimately 

 associated together that it is practically impossible to draw any line of demarcation between 

 them. 



t All the localities in this district, from which the fossils mentioned were collected, are west 

 of the 1st Principal Meridian. 11 



August. 18S9. 



