398 Br. H. Woodivard — Cretaceous Canadian Crustacea. 



of the species, in fact, is the possession of three widely distant, 

 longitudinal, and tuberculated keels, which extend over nearly the 

 whole length of the upper surface of the body." .... 



"Judging by the invertebrate fossils alone, it would seem probable 

 that the friable and fissile shales at Mill Creek, which hold typical 

 examples of Inoceramiis problematictis, may represent the ' Niobrara 

 Group ' of the Upper Missouri section. On similar evidence, also, 

 the rocks of the two localities on the Waterton Eiver, which have 

 yielded respectively Ostrea congesta and VoMceramus exogyroides ; 

 those at the Highwood River, which contain Inoceramiis undabundus 

 and Scapliites Warreni ; those on the north-west branch of the 

 north fork of the Old Man Eiver, from which. Inoeeramus undabundus, 

 Flioladomya papyracen, ScapMtes Warreni, and S. vermiformis were 

 collected ; and those at the entrance to the North Kootanie Pass, 

 which are characterized by Volviceramus exogyroides, Scaphites 

 Warreni, and S. vermiformis, would appear to be as nearly as 

 possible the Canadian equivalents of the ' Fort Benton Group.' 



" In conclusion, it may be remarked that the invertebrate fauna 

 of the * Belly Eiver Series ' seems to be essentially the same as 

 that of the ' Laramie ' of the United States and Canada, unless more 

 than one formation has been confounded under the latter name, and 

 that it is at present scarcely possible to separate the ' Lower Dark 

 Shales ' of Dr. Dawson's Bow and Belly Eiver Eeport from the 

 'Fort Pierre and Fox Hills' Groups on purely palEeontological 

 -grounds." ^ 



Additional note on Linupdrus Canadensis (PI. XVI, Fig. 1), by 

 H. Woodward.— No. 65 c. One half of a dark nodule (6|" X 4"), 

 exposing the under side of a large Crustacean, showing the five 

 sternites and the bases of the thoracic limbs. I have referred this 

 specimen to Dr. Whiteaves' species L. Canadensis, with which it 

 agrees in size, being one of the largest specimens of the fossil 

 Palinurids from this locality. 



It exhibits the under surface of the cephalothorax, with the 

 sterna and the basal joints and portions of the five pairs of 

 ambulatory appendages, one or more being nearly complete. The 

 sternum forms a rather broad and somewhat triangular area, in 

 front of which the mandibles and the labrum are seen, with the 

 spinous stout basal joints of the long stiff antennae. There are also 

 traces of the antennules visible. 



Each sternite, carrying the thoracic limbs, is ornamented with 

 a pair of rounded, sub-central tubercles, except the first, which has 

 only a single central one. 



Upper Cretaceous : Hornby Island ; collected by Mr. Bobbins, 

 preserved in the Provincial Museum at Victoria, B.C. 



Here I would also place a second specimen, preserved in a half 

 nodule, No. 7 (marked 2 in ink), which I refer to L. Canadensis. 

 The half nodule measures 6" x 4", and displays one of the large 

 antennae and five of the walking-legs very well preserved. The 



1 Added from Dr. Whiteaves' Contrib. Canad. Palseont., vol. i (1885), p. 88. 



