174 SUPPLEMENT. 



Magnus Bay on the west coast of Shetland ; not living, and 

 mostly single valves. F. Scotch and Irish glacial beds, Scan- 

 dinavia, and Canada. E. Spitzbergen Bohuslan, 20-150 f. 



P. 158. 1. 16 from top, for Lamarck" r. Philippi." 



P. 159, 1. 4 from top, for " Sassi " r. " Sasso." I am in- 

 debted to the Marquis James Doria for a copy of the Journal 

 which contains Sasso's paper. 



P. 161. LIMOPSIS ATJKITA. N. of Hebr., 189 f. (C. and 

 T.). F. N.W.Germany (Philippi). E. Wellington Channel ; 

 single valves of a large size, with a more oblique outline 

 (Belcher) I One of my Shetland specimens is half an inch 

 long. 



P. 164. L. BOREA'LIS*, Woodward, MS. 



SHELL trapezoidal, with the broader end more or less 

 obliquely extended, depressed, rather thin, opaque, and lustre- 

 less : sculpture as in L. aurita, but without the beaded or gra- 

 nulated character ; the surface is slightly cancellated by lon- 

 gitudinal and concentric striae, which are comparatively fewer 

 and therefore more distant than in that species : colour whitish : 

 epidermis light yellowish-brown, forming a series of ciliated 

 or fringed rows on the longitudinal strias : the outermost fringe 

 projects considerably beyond the edge of the shell : margins 

 rounded in front and at the narrower end, and sloping with a 

 gentle curve from the beak to the broader end : beaks small, 

 blunt, scarcely prominent, incurved : hinge-area long, reddish- 

 brown, striated transversely : cartilage and hinge-line as in L. 

 aurita : hinge-plate rather narrow, occupying about -J of the cir- 

 cumference of the shell : teeth small, 5 or 6 curved ones on the 

 narrower side, and 4 oblique ones on the other side : inside 

 of a dull and chalky appearance, indistinctly striated length- 

 wise, with a row of numerous and small tubercles a little 

 within the edge, which is plain and sharp ; these tubercles 

 encircle the inner rim, and are the terminations of the longi- 

 tudinal striae : pallial and muscular scars distinct. L. 0-325. 

 B. 0-325. 



HABITAT : A small single valve, with L. aurita, in 189 f. 

 about 50 miles north of the Hebrides (C. and T.). E. 

 Nordland, 70-100 f. (M'Andrew and Barrett)!; Upper 

 Norway, at depths reaching to 450 f. (Sars) ! This species 



* Northern. 



