22 Prof. T. Rupert Jones — Canadian Ostracoda. 



Feet. in. 



1. Stratified gravel 10? 



2. TJnstratified Till with striated pebbles 22 



3. Stratified sandy clay, becoming almost a pure laminated clay at bottom, 



where it contains many plants and freshwater shells, — such as Taxus 

 baccata, Elodea Canadensis, Vallisneria ?, Navicula lata, Encyonema 

 prostratum, Dentioula lauta, Zicmophora, Cocconeis ; Lymncea cata- 

 scopium?, Valvata tricarinata (and a keelless variety), Amnicola 

 porata ?, Flanoo-his parvus ?, P. bicarmatus, Pisidium abditum, and 

 S2}h(Brimn striatinum 



4. Stratified grey sandy clay 



o. Slightly sandy stratified clay, coloured dark-brown with bituminoiis 



matter, and containing a few small bivalves 



6. Plastic clay 



7. Coarse stratified sand ... ., 



Covered down to the water 



The specimens under notice were probably taken from the stratum 

 No. 3 of the foregoing section. 



Canbona, Baird, 184:5. 

 1. Candona CANDIDA (Mxiller, 1785). PI. II. Figs, la, h, c. 



Length 1-88, height -88, thickness -8 mm. 



The most common Ostracods in these mai'ls are such as is shown 

 by Fig. 1, evidently closely related to, and probably identical with, 

 the freshwater Candona Candida (Miiller), especially as shown by 

 pi. i. figs, 8a, h, c, and described at p. 19, " Monogr. Tert. Entom. 

 England," Palseont. Soc. 1856, and "Supplement," 1889, p. 13. 

 The posterior extremity, however, is thicker than in fig. 8&, and is 

 such as is seen in some varieties of the species, as depicted by Brady 

 and Norman in pi. 10, "Transact. Eoyal Dublin Society," series 2, 

 vol. iv. p. 38, 1889, and chiefly in the male individuals. For a 

 bibliography of Candona Candida as a living Ostracod, see Wenzel 

 Vavra's memoir on the Ostracoda of Bohemia, in the Archiv 

 naturw. Landesd. Bohmen, vol. viii. No. 3, 1891, p. 48. 



The specimens under notice are subreniform and rather elongate ; 

 with unequal ends, the anterior being smaller and more compressed 

 than the posterior extremity. The dorsal margin is arched, but 

 straight along the hinge-line ; the ventral edge is sinuous, with 

 its middle part incurved. Surface smooth, neatly and moderately 

 convex ; somewhat fuller behind than in the front third. 



Several in the freshwater marl on the Eolling River, which at 

 about 101° W. Long, and 64° N. Lat. runs from the Ducks Mountains 

 into the Swan Eiver for the Swan Lake ; and this is connected with 

 tbe south side of the northern part (Dowson's Bay) of the Winne- 

 pegosis Lake, in Manitoba. See the Geol. Mag. 1893, p. 388, for 

 some remarks on an analogous Candona from the Montana formation 

 in Utah, U.S.A. 



One or more specimens having the appearance of Ilyobates reptans 

 are imperfect. 



