219 



lected l)y Dr. Dawson from rock's of this division on the North Shoi-e 

 of Ciimshewa Inlet. Only one specimen of the shell has been seen, 

 which consists of a cast of both valves with most of the test well j)re- 

 served on the posterioi- half of each. As the sculptui-o of the anterior 

 auricle and that of the median ai'oa of the valves is not known, the 

 identitication of this specimen with T. Suelenais is somewhat uncertain. 



Martesia cARiNii-'ERA, Whitcavcs. 



Plate 29, figs. 2 and 2(/. 



Martesia carinifint, Whiteavos- — 1876. This volume, p. 54, j)!. 9, fig, 7. 



Shores of Bear Skin Bay, in Skidegate Inlet : a fine sjiecimen of a 

 colony of the burrows of this sjiecies in fossil wood, with sevej-al of the 

 shells in situ. 



COBBULA OONCINNA. (N. Sp.) 



Plate 29, figs. 3 and 3a. 



Shell very small, nearly equivalve, the right valve being u little 

 larger than tlie left, inequilateral, moderately convex, the thickness 

 through the closed valves being a little less than the greatest height: 

 outline transversly subovate, the length as compared with the breadth 

 being about as seven to five. Anterior end short and regularly rounded 

 at the margin in both valves : posterior end about one-third longer 

 than the anterior, nan-owing equally towards its termination, which is 

 obliquely truncated and biangular in the left valve and whose ujiper 

 angle is rounded oft* in the right. Cardinal margin rounding abi-uptly 

 downwards in front, straighter and sloping very gently downwards 

 behind: ventral margin convex and evenly rounded anteriorly, 

 straighter and ascendijig very gradually posteriorly, most prominent 

 a little in advance of the mid-length. Beaks broad and not very pro- 

 minent, incurved, inclined slightly forwards and situated about half- 

 way between the centre of each valve and the farthest extremity of the 

 anterior end. On the left valve a distinct umbonal ridge extends from 

 the beaks to the ])osterior end of the base, and behind and above this 

 ridge the valve is inflected at an obtuse angle. On the right valve the 

 corresponding umbonal ridge is almost obsolete and the posterior area 

 ill-defined. 



Surface marked Avith fine, crowded, and rather irregularly disposed 

 concentric ribs. 



Length, seven millimetres ; greatest height, five mm. ; thickness 

 through the closed valves, four mm. 



South side of AUifijrd Bay, Skidegate Inlet, very abundant and in 

 good condition ; Bear Skin Bay, one specimen. 



