No. 2.] MATTHEW POST-PLIOCENE MO&LUSCA. 1 09 



Pecten tenuicostatus var. ? A abell resembling this species in 



form and sculpture occurs at St. John. Tt II thicker than the 

 ordinary form of the species and has fainter striae. 



Toldia HopotUl'i., Gould. — Recent, Labrador to Long Island 

 Sound. — Coralline — Fossil, a single valve at Black Point. This 

 is not the variety of Y. limatula Say, reported by Dr. Dawson 

 from the clays of Riviere do Loup, for it agrees in all respects 

 with Y. sapotilla, and has hinge teeth which are excavated on 

 their outer side. 



Portlandla glacialis, ^xr-.iy {Leda truncata, Brown;. — Recent) 

 Arctic seas.— Fossil, R. C, K. B., T. R St. J St. A. This 

 is the most abundant shell in the great mass of the Leda clay 

 along the shores of the Bay of Fundy, hut is infrequent in the 

 deposits on the south side of Bay Chaleur. The abundance of 

 this shell in the clays of the St. Lawrence Valley led Dr. 

 D v-erj to denominate those beds '■'• Leda clay/' P. glacialis 

 becomes dwarfed and scare- where the deposit called the Leda 

 clay is sandy. 



Leda minuta, Fabricius. — Recent, Greenland t/» Nova. Scotia 

 — Coralline— Fossil, B. P. and St. J. R^ro. Our specimens 

 are shorter and more pouched than those collected at Riviere dn 

 Loup by Dr. Dawson. The -hells; from Ray Chaleur are of the 

 variety c o rap lanata. 



Leda pernula, Muiler. — Recent, Arctic seas to Long I -land 

 Sound— Coralline.— Fossil, R. C. ; B. P., T. R. ; St. <>., St. A. 

 — The varieties tenuUulcata and buccata are common at the 

 localities on Bay Chaleur; but both there and on the Bay of 

 Fundy the former is the more common shell ; while in speci 

 mens from Riviere da Loup v > r. buccata prevails. 



NucvXa tenuis, Montagu. — Recent, Greenland to Casco Bay, 

 Maine. — Coralline. — Fossil, common on Bay Chaleur at the 

 ities named. Not yet found on the Ray of Fundy. 



tfuctlla expansa, Reeve. — Recent, Arctic seas to the Gulf of 

 St. Lawrence. Common at St. John with Portlandia glacial is t 

 and occurs at St. George and St. Andrews. Only one valve 

 from Bay Chaleur (Jaconet R.) 



Modiolaria discors, Linn,? — Recent, Labrador to Massachu- 

 setts Bay. — Laminarian. — Fossil at Black Point, one valve; 

 too imperfect to determine the species but resembles this one in 



form. 



