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



A fragment of an almost smooth pecten, possibly also belonging to 

 Pecten Lindstromi, lies embedded in hard, greyish yellow stone marl, found 

 loose, July 14th, Windy Gully. 



Remarks. The present piece entirely agrees with the description given 

 by Tullberg, of Pecten Lindstromi from the Aucellen strata of Skodde Bay, 

 on the south island of Novaja Semlja (south-west end of Matotschkin Scharr). 



According to the form of the wings, and to its fine sculpturing, Pecten 

 Lindstromi Tullbg. is a Camptonectes, and is allied to Pecten lens Sow. and 

 Pecten rigidus Sow. Pecten Lindstromi differs from the ordinary forms of 

 Pecten lens in the considerably less distinct radial sculpturing, and in the 

 relatively more distinct and regular concentric striation. Among the forms 

 described as Pecten lens, there is one figured by Lahusen from the strata 

 of Perisphinctes mosquensis Fisch. (Upper Callovien) from Tschulkowo 1 - 

 which is rather closely allied to our species, by reason of the more distinct 

 concentric, and fainter radial sculpturing. The radial sculpturing, however, 

 is more distinct in this species of the Russian Jura, than in Pecten Lindstromi 

 Tullb. 



Among the numerous specimens of Pecten rigidus Sow. from the Dogger 

 of Balin (referred to by G. C. Laube as Pecten lens) 2 , a few forms approximate 

 very closely to Pecten Lindstromi Tullb. in the faint radial sculpturing. 



Pecten subannulatus Schlippe 8 from the "Hauptoolith" of Alsace, pos- 

 sesses, according to the given figure (1. c.) of a right valve, radial sculpturing 

 similar to that of Pecten Lindstromi, viz. elongated grooves arranged in rows. 

 In his description of the species, however, Schlippe speaks of radial ribs, and 

 radially arranged ridges. Pecten subannulatus Schlippe is more equilateral, 

 and on the anterior wing exhibits a less distinct concentric sculpturing than 

 Pecten Lindstromi Tullb. 



Pecten (Camptonectes) stygius White 4 , from the Upper Jura of Utah ex- 

 hibits a sculpturing similar to that of Pecten lAndstromi. In addition to fine, 



1 J. Lahusen, 'Die Fauna der jurassischen Bildungen dcs Rjasanschen Gouvernements'. 

 Mem. du Com. geol. St. Petersbourg, vol. I. No. I. pi. II. fig. 2 (not fig 1). 



2 G. C. Laube, 'Die Bivalven des Braunen Jura von Balin'. Denksch. d. Wiener Akad. 

 vol. XXVII. 1867, p. 12 (20). 



8 A. O. Schlippe, 'Die Fauna des Bathonien in oberrheinisehen Tieflande'. Abhandl. zur 

 geol. Spezialkarte von Elsass-Lothringen, vol. V. part IV. 1888, p. 128, pi. II. fig. 3a, h. 



4 C. A. White, 'Report upon the invertebrate Fossils' in Report upon the G. a. G. Ex- 

 plorat. and Surv. West of the 100th Meridian'. 1875, p. Ntt, pi. XIII, fig 2. 



