136 



TOTTENIA GEMMA (Totten). 



Venus gemma, Totten (1834). 

 Gemma gemma, Deshayes (1853). 

 Gemma Totteni, Stimpson (1860). 

 Tottenia gemma, Perkins (1869). 



Grand Manan (Verrill) ; fishing banks off Halifax, rare, (Willis) ; Prince 

 Edward Island (Sir J. W. Dawson) ; Shediac Bay (Whiteaves) ; Green 

 Island, south shore of the mouth of the River Sc. Lawrence (Bell) ; and 

 Indian Harbour, Labrador, at low water (Packard). 



Cttherea convexa, Say. 



Cytherea convexa, Say (1824) fossil ; Gould (1841 and 1870) recent. 

 Cytherea Hayana, Conrad (1833) ; recent. 

 Qallista convexa, H. and A. Adams (1858). 

 Cytherea Sayii, Perkins (1809). 



Oak Bay, N.B. (Ganonsf); St. Mary's Bay, N.S., at low-tides, rare 

 (Verkruzen) ; Sable Island, rare (Willis) ; Shediac Bay, — Northumberland 

 Strait, — and Magdalen Islands (Whiteaves) ; Prince Edward Island (Sir J. 

 W. Dawson). 



LiocYMA fluctuosa (Gould). 



Venus fluctuosa, Gould (1841). 

 Venus asiartoides, Beck (1849). 

 Tapes fluctuosa, Gould (1870). 

 Liocy ma fluctuosa, Dall(1870). 



Widely distributed from the Atlantic coast of Nova Scotia to Labrador 

 and Greenland, in from 10 to about 50 fathoms, but apparently local, though 

 usually abundant where found. Willis quotes it as rare on the fishing banks 

 off Halifax ; and the writer has dredged it abundantly, living, both on the 

 Bradelle Bank and in Gasp^ Bay. Packard says that he dredged a single 

 valve of it on the bank near Caribou Island, (in 1860), and that he subse- 

 quently (in 1864) found it not uncommon in Henley Harbour and off Square 

 Island, Labrador. Miss Bush also records its having been taken by the Stearns 

 Labrador expedition (in 1882) at L'Anse au Loup and Henley Harbour, in 

 10 to 15 fathoms ; and Beck, at Mahls-alik, Greenland. 



The shells of living specimens of this species are usually white, with a 

 very thin hyaline outer layer, the surface of which has a highly polished 

 appearance, but exceptionally they are of a pale reddish brown colour, and 

 even approaching to orange. 



