NO. 2.] DESCRIPTION OF THE FOSSILS. 67 



Leda de Geeri Lundgreen x from Spitzbergen, are very similar to our form in 

 outward appearance, differing, however, in their shorter length. 



Leda cf. nuda Keys. sp. is embedded, together with Cadoceras sp. ex. 

 off. Cad. Nanseni (n. sp.), in a piece of rusty brown, weathered clay sand- 

 stone. The piece was found loose on July 12th, 1896, near the margin of 

 the glacier north west of Elmwood. 



CUCULL/CA Lamarck. 

 SUB-GEN. MACRODON, LYCETT. 



Macrodon Schourovski F. Rouillier sp. 

 PI. I. fig. 17. 



1847. Cucullcea Schourovskii F. Rouillier, 'Etudes progressives sur la 

 Paleontologie des environs de Moscou'. II Et. Bull, de la Soc. Imper. des 

 Natural, de Moscou, 1847, I. 2, p. 428, pi. H, fig. 39. 



The figured cast (with fragments of shell) of a right valve, agrees 

 perfectly in its outline, in the position of the apex, and in the sculp- 

 turing (fine concentric lines), with the species figured by Rouillier from his 

 "seconde etage" of the Jura of Moscow, as Cucullcea Schourovski. The edge 

 running, in the drawing, from the umbo to the lower posterior angle, and 

 the depression extending from the apex to the inferior margin, has only 

 been produced by oblique pressure of the valve. In uncompressed specimens, 

 this edge and depression do not exist, as I was able to convince myself by 

 a second, unfortunately in other respects more imperfect piece. In this second 

 specimen, remains of the cardo may be recognised in front of the apex are 

 oblique, not very short, behind the apex long, almost perfectly horizontal 

 lateral denticles, with distinct, close serrations. 



Unfortunately, Rouillier has not drawn the hinge in his figures. Judging 

 from the hinge-line visible in fig. 39b (1. c.), Rouillier's species is either a 

 Cucullsea, or a Macrodon. Trautschold 2 places Rouillier's Cucullcea Schou- 

 rovskii with Cucullcea elongata Sow. 3 , that is to say, in the sub-genus Macro- 

 don. As the cardo of the pieces from Cape Flora now before me has thus 

 proved to be a Macrodon cardo, and as the pieces agree perfectly in form 



1 B. Lundgreen, 1. c. p. 13, pi. 2, figs. 3 & 4. 



2 H. Trautschold, 'Der Moskauer Jura verglichen mit der Westeuropttischen'. Zeitsch. d. 

 Deutsch. geol. Ges. 1861, p. 408. 



3 Sowerby, 'Mineral Conchology', pi. 447, fig. 1. 



