WMiTEAVEsJ DEVONIAN FOSSILS OF MANITOBA, ETC. I'fjg 



A few badly preserved specimens of a shell, Nvhioh may be a variety of 

 S. mbelliptica, were collected by Mr. Tyrrell, in 1889, at a small island 

 off Weston Point, Lake Winnipegosis. They differ from the typical 

 form chiefly m being almost exactly twice as long as high, and in the cir- 

 cumstance that their posterior umbonal slopes are obscurely or very 

 faintly subangular. 



,S'. subelliptica is obviously congeneric with SpcMella ventricosa, the 

 Orthonota ventricosa of White and Whitfield, as figured by Hall*, and 

 differs from that species only in being much shorter in proportion to its 

 height. It may prove to be identical with the C ypricardites vralicns of 

 Tschernyscliew, t 



(S.) GONIOPHORA PERANGULATA, Hall, Var. 



Pfate 39, figs. 1 and la. 



8an<iuinoUte-s ptranrjidafux. Hall. Prelim. Notice Lam. Shells, p. .35. 

 Goniophora ptrangidata. Hall. 1883. Pal. St. N. Y., vol. T, pt. 1, Plate.? and Ex- 

 planations, p. 12, pi. xxxiv, figs. 1-7. 

 Waloott. 1884. Pal. Eureka distr. 'Sev&ia,, p. 171 pi xv 



fig. 10. 

 Hall. 188.5. Pal. ,St. X.York, vol. V, pt.l, Lamellibr., 2, p. 

 293, pi. xxxiv, figs. 1-ti, and pi. xlii, figs. 1 and 2. 



Dawson Bay, Lake Winnipegosis, two miles west of Salt Point, and on 

 one of the small islands east of Salt Point, J. B. Tyrrell, 1889 ■ a some- 

 what imperfect cast of the interior of the partly open valves, from each 

 of these localities. 



These two specimens, which are rather doubtfully referred to G. peran- 

 gulata, appear to be in some respects intermediate in their characters 

 between that species and G. acuta, Hall, their hinge line, in particular, 

 being apparently longer proportionately than that of G. perangulnta. In 

 the specimen figured, the posterior half of the dorsal margin is imperfect, 

 but when entire, the dorsal margin was probably regularly arched and 

 moderately convex for the whole of its length, and not flattened somewhat 

 obliquely behind, as represented in fig. 1. 



(S.) MaCRODON PYC4MiEUS. (N. Sp.) 



Plate 39, figs. 2 and .3. 



Shell decidedly small, usually less than half an inch in length, narrowly 

 elongated, nearly or quite twice as long as high, somewhat trapezoidal and 



* Pal. St. N. York, vol. V. pt. 1, Lamellibr. 2, p. 408, pi. Ixvi, figs. 41 and 42. 

 + Die Fauna des Mittl. und Oberer Devon am West— Abh. des itrals. 1887. Me- 

 moires du Comite Geolog., vol. Ill, p. 50, pi. vii, figs. 4 and 5. 



