WHITEAVES.] DEVONIAN" FOSSILS OF MANITOBA, ETC. 273 



(S.) Pachypora cervicornis, DeBlainville. (Sp.) 



For a list of the synonyms of this species, witli references, see page 206 of the pre- 

 sent volume. 



Lake Manitoba, on the east side of the narrows, near Manitoba Island; 

 on the north-west side, at Big Sandy Point, Monroe, Pentamerus and 

 Onion Points ; and on the north-east side, north of Steep Rock Point, 

 J. B. Tyrrell and J. F. Whiteaves, 1888 : more or less abundant at each 

 of these localities. 



Dawson Bay, Lake Winnipegosis, on five small islands at the south end 

 or south-east side, also on its western shore at five localities between the 

 mouths of the Steep Rock and Red Deer Rivers, and on two small points 

 immediately north of the Red Deer River, J. B. Tyrrell and D. B. Dow- 

 ling, 1889 : a few specimens from each of these localities. 



Pachypora, or Alveolites. (Sp. Undet.) 



Red Deer River, at the Upper Salt Spring, and about five miles from 

 Lake Winnipegosis, D. B. Dowling, 1888 : two specimens, but obtained 

 abundantly on the same river, at the Upper and Lower Salt springs, by 

 J. B. Tyrrell in 1889. A few specimens also were collected by Mr. Tyrrell 

 in 1889 at several localities in the southern portion of Lake Winnipegosis, 

 as at the south end of Snake Island, the north side of South Manitou 

 Island and Point Brabant, also at two localities on the south-west side of 

 Dawson Bay. 



The specimens from these localities consist of rather small or medium 

 sized corals, with much the same general shape and proportions as Pachy- 

 pora polymorpha. The stems are cylindrical, widely and doubly bifurcat- 

 ing, with an average diameter of about eight or nine millimetres in the 

 thickest part. The corallum in each seems to differ from that of P. poly- 

 morpha in the much greater obliquity with which its corallites open out- 

 ward to the surface ; also, in the circumstance that their apertures are 

 frequently transversely semielliptical, semilunar, or sub-triangular, and 

 broader than high, with the lower lip of each distinctly projecting. In 

 most respects, these specimens agree remarkably well with the published 

 descriptions and figures of Alveolites cryptodeiw, Billings, and even with 

 the types of that species in the Museum of the Survey, but the throats of 

 their corallites are almost invariably filled with dolomite, and shew no 

 traces of the three internal ridges or "longitudinal crests" which are so 

 characteristic of A. cryptodems. 



2i 



