230 



with the A. ventricosa of Meek on page 155 of the Report of Progress 

 of the Geological Survey of Canada for 1876-7*7, most probably also 

 belong to the present species. 



UNIO HUBBAEDI, Gabb. 



Unio Hubbardi, Gabb. 1869. Paleontology of California, Vol. 2, p. 190, pi. 30, 



fig. 85. 

 " Whiteaves. 1876. This volume, p. 65, pi. 9, fig. 13. 



Hooper's Creek or King's Tunnel, Cowgitz' coal mine : very abundant. 

 It was collected at the same locality by Mr. Richardson in 1872. 



As pointed out on pages 66-67 of the present volume, the hinge den- 

 tition shows that the species is a true Unio and not & Margaritana nor an 

 Anodon. 



' TRIGONIA DIVERSICOSTATA, Whiteaves. 



Trigonia diver iricostata, Whiteaves. 1876. This volume, p. 68, pL 10, fig. 1. 

 Bear Skin Bay, Skidegate Inlet : three specimens. 



TRIQONIA MAUDENSIS. (K Sp.) 

 Plate 31, fig. 2. 



Shell moderately convex, longer than high,very inequilateral: anterior 

 end short and rounded : posterior end produced into a rather long and 

 pointed beak, which narrows gradually both above and below, and 

 whose lower margin is somewhat convex and upper margin shallowly 

 concave. Umbones narrow but very prominent, placed about half way 

 between the centre and the farthest extremity of the anterior end ; 

 beaks, small, curved inwards and downwards: posterior area well 

 defined and bounded by a rather prominent carina, which is acutely 

 angular near the beaks and obtusely angular behind the middle of the 

 valves. 



The front and central portions of the sides of the valves are marked 

 by simple concentric ribs, but at the pointed extremity of the posterior 

 third of the sides these concentric ribs are crossed by a few radiating 

 costse, which commence at or a short distance below the outer boun- 

 dary of the posterior area and extend to the ventral margin. In the 

 most perfect specimen, which was collected at Maud Island, there are five 

 radiating ribs on the posterior extremity, two of which, the ones nearest 

 to the anterior end, are comparatively broad, while the three behind 

 them are very narrow and inconspicuous. In two moulds of the exte- 

 rior of a small Trigonia from Cumshewa Inlet, however, which probably 



