62 



POMPECKJ. JURASSIC FAUNA OF CAPE FLORA. [norw. pol. EXP. 



The differences behveen it and the few known Mesozoic, and more recent 

 Meleagrines, are the size of the anterior wing, the consequent length of 

 the byssus-fissure, and the marked radial sculptm'ing of the left valve, 

 which, as far as I know, has not before been observed to such a degree 

 of clearness in Meleagrines. On account of the slight obliquity in the outline 

 of the valves, of the ornamentation of the valves by radial ribs, of the shape 

 of the anterior wing and of the direction of the byssus-fissure, the species 

 before us must be separated from Meleagrina and reckoned as Pseudomonotis. 

 Though the oblique ligament-groove does not agree with the known species 

 of Pseudomonotis, all the other characteristics of our species agree completely 

 with this genus; especially the cupshaped, deep groove below the ligament- 

 area is also to be seen in the right valve of Pseudomonotis, e. g. Pseudomon. 

 echinata Sow. sp. On account of the large size and of the degree of orna- 

 mentation the species before us must be regarded as a new one. 



Pseudomonotis sp. (cf. ornati Quenst. sp.) 

 Letterpress fig. 10. 



In grey-brown, weathered clay sandstone July 16th, 1896, 500—550 ft above 

 sea level, north of Elmwood, several fragments and impressions of a Pseu- 

 domonotis were found, of which the most perfect are figured here. 



The smaller right valve is moderately convex, 

 and exhibits an indistinct, concentric striation. The 

 larger, highly convex left valve is thickly ornamented 

 with fine unequal radial ribs. Here, too, the con- 

 centric sculpturing is but faintly developed. 



A similar, perhaps corresponding form, I found 

 with Cadoceras Nanseni (PI. II. fig. 6.) in greyish 

 yellow, argillaceous stone marl (July 14th, Windy 

 Gully 400 ft). 



Remarks. Judging from the greater convexity 

 of the right valve, and the fine radial sculpturing of 

 the left valve, the present Pseudomonotis sp. is related to Pseudomonotis 

 ornati Quenst. spi. On account of the imperfect material, it cannot be 



Fig. 10 Pseudomonotis sp. 



(cf. ornati Quenst. sp.) 

 a right, 6 left valve; figured 

 from a waxcast, 2 X enlarged, 



i F. A. Quenstedt, 'Der Jura', p, 553, pi, 72, fig. 33. A similar form, but from the Ox- 

 fordian from Viel-St -Remis (Ardennes), is before me. 



