SUPPLEMENT. 183 



P. 311, 1. 3 from top, for "costatus" r. " sulcatus" 



P. 311. ASTARTE STTLCATA. 



BODY yellowish or pale orange, with a tinge of fleshcolour : 

 mantle slightly grooved lengthwise at the edges, which are 

 thickened and plain ; there are a few small white tubercles at 

 the posterior side : foot tongue-shaped, pale yellow : gills deli- 

 cately pectinated. 



Typical. N. of Hebr., 170-550 f. (C. and T.). F. Norway 

 (Sars and others); Antwerp Crag (Nyst) ; Messina (Seguenza) ! 

 E. Loffoden L, 300 f. (Sars) ; Hveen, Denmark ((Ersted) ; 

 Cherbourg (Recluz). Var. Scotica. F. Norway (Sars). E. 

 Loffoden L, 250 f. (Sars) ; Brittany (Recluz); Toulon (Sou- 

 leyet). Var. elliptica. F. Scandinavia, Canada, and U. S. 

 E. Labrador (Packard). A form intermediate between this 

 variety and the type has been found in a fossil state at Belfast 

 by Mr. A. Bell, and living in the Faroe Isles by Sysselman 

 Miiller. Var. incrassata. F. N.W. Germany (Philippi); Italy 

 (Brocchi and others). 



P. 315. A. COMPRESSA. 



BODY yellowish or pale orange : mantle slightly lineated to- 

 wards the edges, which are thickened, of a darker hue, and 

 minutely tuberculated on the posterior side: foot tongue- 

 shaped, yellowish-brown. 



E. Vancouver's I. (P. Carpenter, as A. compacta). Var. 

 globosa. N. of Hebr., 530 f. (C. and T.). F., with var. striata, 

 Siberia, Labrador, Canada, and U. S. This species is Venus 

 Hontagui, Dillwyn. 



P. 318. A. TRIANGULARIS. F. Antwerp Crag (Nyst, as A. 

 minuta) ; N.W. Germany (Philippi, as A. Icevigata) ; Monte 

 Mario (Conti, as Cydina undata) ! E. Brittany (Recluz) ; 

 Loire- Inferieure (Cailliaud) ! 



p. 319. A. crebricostata. N. of Hebr., 550 f., in "cold area" 

 (C. and T.). F. Gardiner, Maine co. (Lyell). A. Warhami, 

 Hancock. 



P. 320. A. borealis. F. Greenland, Scandinavia, and N.E. 

 America. 



P. 322. CIRCE MINIMA. F. Antwerp Crag (Nyst, as Cy- 

 therea triyona); Italy (Calcara and others). E. Bergen (Sars) ; 



