66 POMPECKJ. JURASSIC FAUNA OF CAPE FLORA. [NORW. POL. EXP. 



Litnea cf. duplicata Goldf. was found in grey, clayey sandstone, on 

 July 16th, 1896, 500550 ft. above the sea, north of Elmwood. 



LEDA, Schumacher. 



Leda cf. Nuda Keys. sp. 

 Letterpress fig. 11. 



1846. Nucula nwda Keyserling, in A. Graf Keyserling und P. von Kru- 

 senstern, 'Wissenschaftliche Beobachtungen auf einer Reise in das Petschora- 

 Land im Jahre 1843,' Petersburg, 1846, p. 307, pi. 17, figs. 7-9. 



The cast here figured of a flat, 

 elongated left valve, agrees very well 

 in outline and in dimensions (length 

 circ. 25 mm., height circ. 12 mm.) with 

 the Leda (not Nucula) nuda found 

 by Count Keyserling at the mouth of 



the Ischma, and at Poluschino in Pet- 

 Fig. 11. Leda cf. nuda Keys. sp. Cast 

 of the left valve showing the impressions schora Land. Count Keyserling states 



of car^dinal^enUculation. ^ ^ ^^ ^^^ in ^ ^^ 



are very long and numerous - more 



than 16 along the posterior margin. In the present form, the impres- 

 sions of more than 30 hinge denticles may be counted behind the umbo. 

 This difference prevents me from directly identifying our specimen with the 

 species described from Petschora Land. 



Leda nuda Keys. sp. is also recorded by Lindstrom 1 and Lundgreen 2 

 from Spitzbergen. From Lindstrom's figure, however, it appears to be doubtful 

 whether this species really also occurs in Spitzbergen. Lindstrom's Leda 

 nuda shows a very much more sharply projecting umbo. 



Leda (Nucula) Phillipsi Morris 3 from the Oxford Clay of Wiltshire, and 



1 G. LindstrOra, 'Om Trias- och Juraforsteningar fran Spitzbergen'. K. Svensk. Vetensk. 

 Akml. Handl. vol. 6, 1865, p. 12, pi. II. fig. 16 (compare reference to Nucula nuda 

 Phillips, 'Geology of Yorkshire.' I. pi. V. fig. 5). 



8 B. Lundgreen, 'Bemerknungen fiber die von der schwedischen Expedition nach Spitz- 

 bergen 1882 gesammelten Jura- und Trias-Fossilien". Bihang till K. Svenska Vetensk.- 

 Akad. Handl. vol. 8, No. 12, p. 12. 



3 J. Morris, 'List of Organic Remains etc.' in R. N. Mantell, 'An Account of the Strata 

 and Organic Remains exposed in the Cuttings of the Branch Railway, . . . etc. . . 

 Wiltshire'. Quart. Journ. Geol. Soc. London, 1850, p. 318, pi. XXX. fig. 1. 



