No. 2.] MATTHEW — POST-PLIOCENE MOLLUSCA. HI 



Astarte Banksii, Leach. — Recent, Greenland to Nova Scotia. 

 — Fossil at St. John. This species has more prominent beaks than 

 the last, and the anterior border is arched inward more deeply 

 at the lunule. 



Spisula solidissima, Chemnitz ? var. Acadica* Recent, 

 Labrador to Long Island Sound. — Littoral to Laminarian. — 

 This form is from the higher clay beds at St. John ; and in 

 ponderosity, form of the cartilage pit, position of the beaks, and 

 shortness of the lateral teeth, approaches the European S. solida. 

 It may be an arctic variety of S. solidissima. Height If, 

 length If. 



Macoma fnsca, Say, var. Groenlandica, — Recent, Greenland 

 to the B;iy of Fundy. — Littoral, the variety Laminarian (to 

 Coralline ?) Fossil, R. C, B. P., T. R., St. J., St. A. A 

 small rough variety abounds at Lawlor's Lake near St. John, in 

 a bed which appears to belong to the Saxicava sand, but a 

 larger and smoother form is the most abundant at Bay Chaleur; 

 the latter recalls M. solidula of Europe, but is distinct. M. 

 Groenlandica still lives in the deeper waters of the Bay of 

 Fundy, and in the sand-flats along its shores M.fusca abounds. 



Macoma calcaria , Chemnitz. — Recent, Greenland to the Bay of 

 Fundy. — Coralline.— Fossil, same localities as the last species, 

 but while that (on the Bay of Fundy at least) is confined to the 

 Saxicava sand and upper part of the Leda clay, this one ranges 

 through the whole of the latter deposit. 



Pandora (Kennerlia) glacialis, Leach. — Recent, Arctic seas 

 to the Gulf of St. Lawrence.— Fossil at St. John. Frequent in 

 the starfish beds at Duck Cove. It was first referred to P. trilin- 

 eata, Say., from which Dr. Dawson says it is quite distinct. 



Lyonsia arenosa, Moller. — Recent, Greenland to Nova Scotia. 

 — Fossil with the last species. 



Lyonsia Norvegica f — Recent, Arctic seas. — Fossil with the last 

 two species, and more common than Pandora glacialis. From 

 Lyonsia hyalina, Conrad., this shell differs in being more ven- 

 tricose, somewhat higher, and in having no radiating furrows, 

 though in some individuals there are obscure radiating lines. I 

 have not seen P. Norvegica and therefore am not sure of the 

 identity of our shell with it. 



* N.B. I find that this shell agrees very closely with specimens of 

 S. truncata, Mont, received from England, and differs chiefly in the 

 .shortness of the lateral teeth and in having a more oval outline. It 

 may he an exotic. 



