NO. 1312. SYNOPSIS OF THE ASTARTID.E-DALL. «)47 



containing a few specimens of natural history from the most northern 

 Land reached, Bennett Island. Among- these were a fragment of 

 Astarte horealls and a single perfect specimen of the present species, " 

 U.S.N.M., No. 83221. A single other specimen was ohtained by nlr 

 within the limits of the arctic fauna in the northern part of Bering 

 Sea, in 24 fathoms. Leche's ligure is slightly more oblique and con- 

 vex, but very probably represents the same species. 



ASTARTE (LAURENTIANA var. ?) SOROR, new species. 

 Plate LXII, fig. 11. 



Shell of moderate size, subequilateral, rounded-trigonal or cvthcn-i- 

 forni, the beaks moderate!}^ elevated, full and prosogvrate; the ante- 

 rior end slightly shorter, the lunulc i-ather small, lanceolate and 

 impressed, the escutcheon similar ])ut longer; surface covered with 

 fine, rather harsh concentric sulci with subequal interspaces, vei'v 

 uniform over the surface; periostracum dull, of a dark brown color 

 sometimes paler or olivaceous in the young; hinge delicate, laterals 

 distinct, large cardinals sulcate or striated above; inner margins 

 entire. Height 18.0, length 21.5, diameter 10.0 nnn. 



This species differs from A. fahida by the sculpture of its uni])ones 

 and the sulcation of the whole disk externally; it has the same kind 

 of sculpture as A. Jaurentiana but coarser and more harsh to the 

 touch; the form in general is more trigonal or rounded than in 

 A. laurentiana^ but this is varia])le and some specimens agree well in 

 shape. A. polar is is distinguished by deeper excavation of the lunulc, 

 smoother and more open sculpture, and the crenation of the inner 

 margins. 



This is the species of which young individuals have been taken for 

 recent specimens of A. laurentiana, but which I am inclined to regard 

 as distinct, especially since no fossil laurentiann api)roach it in size. 

 Jeffreys included it, with a number of other things which api)ear to 

 me distinct, under the name of A. amipressa var. striata. The type 

 locality is Godhavn Harbor, Disco Island, Greenland. U.S.N. M.. 

 No. 109278. 



The typical A. laurentiana was described l)y Lyell in his Travels 

 in North America in 1815. In the American edition, published the 

 same year, it can be found figured, page 125, figs. 15a-15c. and 

 described on page 126 of the second volume, a reference which I had 

 some difliculty in finding and which was kindly supplied by Dr. 

 Whiteaves. It is found in the Pleistocene clays of the St. Lawrence 

 Valley. 



«The other niolluscan specimens iiu-luded egg cases of Bcla s|>., Chn/Kodomns .sp., 

 and Natku sp., and fragments of Liocymdjtuclaosa Gould, Modhlarla ,i!>/ra Ciray, an.I 

 Yoldia abyssicola Torell; U.S.N.M., Nos. 83220-83227. 

 Proc. N. :M. vol. xxvi— 02 03 



