306 ('(INTIUBUTIOXS TO CANADIAN PAL.BONTOLOCiy. 



rocks at Snake Island in Lake Winnipegosis. Both of these were tigiired 

 liy :\[r. E. Billings (op. cit. p. 187), who regai-ded one as identical with 

 Liirinn e//tji/i(/ii, Conrad, (sic), and descril)ed the other as a new species, 

 under the name Liirimi <irci<h'ntiili.K. To the present writer these two 

 specimens appear to be merely somewhat distorted individuals nf the same 

 species, the one referred to L. cUipt'irii being aljnormally compressed in 

 the direction of its height, and that described as A. oi-ridfuiiilis in the 

 direction of its length. Similar specimens collected by Messis. Tyrrell 

 and the present writer, at Manitoba Island and Onion Point, Lake jMani- 

 toba, in 1S88, a)id by Messrs. Tyrrell and Dowling abundantly at most of 

 the exposures on the shores or islands of Lake ^\'innipegosis, in 18,S0, are 

 almost exactly intermediate in their characters between /' i'1U]tlir<t, 

 Hall, and /' linitu, Conrad. They perfectly resemble the latter species 

 both in size and shape, but their "concentric undulations of growth " are 

 rounded and flattened, not prominent and subangular as in J', /int/a. It 

 is highly probable, however, that /-■ /'llijitka is only a variety of 1' lirnid. 



Both the typical form and the var. occidfv/n/is of Billings (not of Hall 

 and Whitfield) are most abundant in the argillaceous limestones abo\ e 

 the Stringdcephalus zone, and at the local base of the Upper Devonian. 



In his latest description of /'- /'Iliptirti., Prof. Llall ])oints out that it is 

 "subject to great variation in form from compression," a statement whicli 

 is equally applicable to the specimens from Lake Winnipegosis, four of 

 which are represented on plate xxxix. Fig. 8 on that plate represents 

 the type of L. nrriilfiilnlis, Billings, the wood-cut of that shell in Prof. 

 Hind's report being neither as accurate nor as characteristic as could be 

 wished. Fig. 7 represents a specimen from Dawson Bay, which is (juite 

 free from distortion or compression. In the original of fig. 10, which is 

 from the Red Deer River, at the Upper Salt Spring, the compression in 

 the direction of the height has reached its maximum, while in the original 

 of fig. 9, which is also from the Red Deer River, the compres.sion has 

 obviously been oblique. 



(S.) Paracvolas. (Sp. Undt.) 



Plate 39, tigs. .5 and Tkl, 



Three specimens of a large and apparently undescriljed .species of I'dra- 

 riji-htx were collected by Mr. Dowling, in ISSi), on the western shore of 

 Dawson Bay, at the first small point north of the mouth of the Red Deer 

 P>i\'er. Two of these are casts of the interior of the shell, and one is a 

 natural mould of the (exterior of the closed valves, but all Www aie too 

 imperfect and too badly preserved to admit of identification or descriii- 

 ticm. The figures on plate xxxix are taken from a wax impression of the 



