196 B GEOLOGICAL SURVEY OP CANADA. 



JLntodesma saxicola, Baird. Bocks at low water. 



Mytilimeria Nuttalli, Conrad. "With the last species. 



Siliqua patula, Dixon. Beach between Masset and Eose Point, several 

 dead but very perfect and well-preserved shells. 



Psammobia rubroradiata, Nuttall. Mouth of Cumshewa Harbour, in 20 

 fathoms, one dead shell. 



Macoma inquinata, Deshayes. Virago Sound, in 8 to 15 fathoms, one 

 specimen. 



Macoma sabulosa, Spengler, var. Dixon Entrance, Q.C.I., in 111 

 fathoms, three examples. 



Macoma inconspicua, Broderip and Sowerby ? Large variety. Yirago 

 Sound, in 8 to 15 fathoms, one perfect shell and a single valve. 



Macoma Carlottensis, Nov. sp. 



Fig. 1. Macoma Carlottensis, left valve, nat. size. 



Shell small, moderately inflated, thickness rather more than one- 

 half the height, inequilateral; valves slightly flexed to the right 

 posteriorly ; test thin and fragile. 



Anterior side produced, evenly rounded at its extremity, and nearly 

 twice as long as the posterior side ; posterior side short, much narrower 

 than the anterior, subcuneiform, sloping convexly and abruptly from 

 above downwards, and at last forming a subangular junction with the 

 ventral margin below. Ventral margin gibbous in advance, ascending 

 and much straighter behind. Beaks small, moderately prominent, 

 incurved, and placed considerably behind the middle. Ligament short, 

 external. 



Surface glossy, marked by very fine, close-set, concentric striations, 

 and by a few, distant, lines of growth. Colour of young shells trans- 

 lucent and often opalescent white or whitish. The lower portion of 

 adult shells, when in good condition, is covered with a thin, pale ashen- 

 gray epidermis, and the shells themselves are often tinged with a pale 

 grayish or brownish hue. 



Eight valve with two minute, widely diverging, cardinal teeth ; left 

 valve with a single, very small, narrowly triangular tooth, which 



