194 



Little Black Island, Lake Winnipeg, D. B. Dowling and L. M. Lambe, 

 1890 : one specimen which is unfortunately not well enough preserved to 

 be figured satisfactorily. 



The genus Solenospira has recently been constituted by Messrs. Ulrich 

 and Scofield (in their monograph of the " Lower Silurian Gastropoda of 

 Minnesota ") * for the reception of a group of MurchisoniaAihQ shells, of 

 which Eunema (?) pagoda and E. prisca of Salter, are the types. Accord- 

 ing to Mr. Ulrichi in a letter dated May 12th, 1896, " they have a notched 

 aperture like Hormotoma and Lophospira, and are widely different from 

 Eunema strigillata, Salter, which is nothing more than a high-spired 

 Trochonema. Solenospira is distinguished from Hormotoma by the strong 

 revolving ridges and great width of band.'' 



Maclueea (Maclueina) Manitobensis, Whiteaves. 



Plate 20, fig. H. 

 Maclurea Manitobensis, Whiteaves 1890. Trans. Royal Soe. Canada, vol. VIII., 



sec. 4, p. 75, pi. 12, and pi. 13, figs. 1 and 



2; and (1893) Canad. Rec. Sc, vol. V, p. 



324. 

 J^aclurina Manitobensis, Ulrich & Scofield. .1897. Geol. Minn., Final Rep., vol. Ill, pt. 



2, p. 1041. 



Amended description. — Shell large, attaining to a maximum diameter 

 of eight inches and a half, and consisting of about five somewhat slender 

 volutions, which increase rather slowly in size : outer volution nearly 

 always distinctly angulated at the periphery. Plat side faintly depressed 

 in the centre in some specimens and as faintly raised in others : volutions, 

 as viewed on this side, very shallowly concave in the centre and slightly 

 raised on their outer margins : suture lightly impressed. Convex side 

 moderately prominent (the greatest thickness or depth varying in differ- 

 ent examples from two-fifths to one-third the maximum diameter) : some- 

 what conical or subhemispherical, the outer volution obliquely flattened 

 and narrowing very rapidly, but in a few specimens somewhat convexly, 

 from the periphery to the umbilical margin : umbilicus deep, conical, and 

 moderately wide : aperture obliquely and rather narrowly subtrapeziform : 

 outer lip apparently simple : test thick. 



Surface of the test on the flat side marked with irregularly disposed, 

 but for the most part distant, transverse linear grooves or periodic 

 arrests of growth, each of which curves gently backward in a shallowly 

 convex curve, and occasionally with a few striations which run parallel to 

 them. In the specimen figured on Plate 13, fig. 1, of the eighth volume 

 of Transactions of the Royal Society of Canada, which is little less than 

 four inches in its greatest diameter, and in which the whole of the test is 



* Published in volume III., part 2, of the Final Report of the Geology of Minnesota. 



