100 POMPECKJ. JURASSIC FAUNA OF CAPE FLORA. [norw. pol. exp. 



BELEMNOIDEA. 



BELEMNITES LISTER. 



Only some of the numerous Belemnite fragments from various rocks can 

 be approximately determined. 



The best preserved fragments belong to a species of the group "Explanati" 

 (A. Pawlow).^ Judging from its form, this species combines to a certain 

 extent the characteristics of two species of the Russian (and Central European) 

 Jura, viz. Belemnites subextensus Nik. and Belemnites Panderi d'Orb. These 

 characters will be taken account of in the following description. 



Belemnites m. f. subextensus Nik. — Pcmderi d'Orb. 



PI. I. figs. 18-21 b. 



1897. Belemnites Panderi E. T. Newton ; E. T. Newton and J. J. H. Teall, 



1. c. Quart. Journ. Geol. Soc. London, vol, 53, p. 498. 



PI. XXXIX. figs. 11-14. 

 [Cf. 1884. Belemnites subextensus S. Nikitin, 'Die Cephalopoden der Jura- 



bildungen des Gouvernements Kostroma'. Verhandl. d. 



k. Mineralog. Ges. zu St. Petersburg, vol. XX. p. 61. 



PI. VI. fig. 28. 

 1845 (44). Belemnites Panderianus A. d'Orbigny; Murchison, Verneuil et 



Keyserling, 'Geologie de la Russie'. Vol. II. Paleontologie, 



p. 423. PI. 30.] 

 The guard is rather short, and comparatively slender (figs. 18 a and 19 

 are so put together from other pieces, that the apex of the guard and the 

 beginning of the alveole are at a correct distance from one another). The 

 alveole occupies scarcely half the lenght of the rostrum. The rostrum ends 

 in a short, somewhat obtuse, eccentrically situated point (figs. 20 b, 21 b;. On 

 the somewhat flattened ventral side, a short, rather narrow groove, becoming 

 rapidly broader and flatter anteriorly, issues from the apex. The flanks of 

 the rostrum — behind the alveolar part — are flattened by very shal- 

 low, broad, imperfectly preserved grooves (figs. 20 b, d). The section of 

 the guard varies. Behind the alveolar part, the dorso-ventral axis is 



' A. Pawlow et G. W. Lamplugh, 'Argiles de Specton et leurs Equivalents'. Bull, de la 

 Soc. Imper. des Natural de Moscou. 1891. Sep. copy, p. 91. 



