Rev. G. F. Whidhorne — Devonian Fossils, Devonshire. 537 



Orthotetes umbeaculum, Schlotheim, sp. (PI. XVIII, 

 Figs. 7, 7a.) 



1865. Streptorhi/nchus umhracuhim, Davidson: Brit. Foss. Brach., vol. iii, p. 76, 

 pi. xvi, fig. 6 ; pi. xviii, figs. 1-5. 



A few moulds of this species occur, which are interesting from 

 their having well preserved the minute surface-ornament, which has 

 been described by Davidson, but is rarely, if ever, fully seen in 

 the numerous specimens from Lummaton and other higher beds. 

 A wax-cast shows this to consist of very numerous and regular 

 " scale-like projections on the striaB," which are not only connected 

 in the interspaces by the corresponding growth-lines, but by a still 

 finer superficial series of elevated microscopic lineations, slightly 

 irregular and arching, and at the rate of about five to each growth- 

 line. This finer ornament is so minute that it can only be seen 

 by a strong lens, but it is extremely beautiful. 



Lower and Upper Coblenzien and higher beds. 



Stkophomena rhomboidalis, Wilckens. 



This species is represented by a fine cast of the closed valves and 

 by an interior of the lower valve. The former appears to have 

 been a very deep shell, and shows much detail ; its characteristic 

 ornament can be discerned on the covering mould. 



Upper Coblenzien and higher beds. 



Steopheodonta t^niolata, Sandberger, sp. (PL XVIII, 

 Figs. 8, 8a, 86, 9, 9a, 96.) 



? 1842. Orthis Sedgwickii, D'Arch. & De Vern. : Geol. Trans., ser. ii, vol. vi, 

 p. 371, pi. xxxvi, fig. 1. 

 1853. Strophomena tceniolata, Sandberger: Verst. Rheiu. Nassau, p. 360, 

 pi. xxxiv, fig. 11. 



Shell apparently convex, somewhat deflexed in front, and about 

 as long as wide. Hinge-area narrow, as long as the width of the 

 shell, bearing numerous strong dentations. Ornament consisting 

 of multitudinous, fine, straight, regular stride, divided into groups 

 of five or six by somewhat stronger ribs, half of which only reach 

 half-way to the umbo. 



Size : about 20 mm. long by 25 mm. wide. 



This species is not very rare in these beds, bat the specimens are 

 very much squeezed and fragmentary, probably from its being 

 a delicate shell. Its ornamentation was evidently very beautiful. 



It appears exactly to agree with the shell figured by Sandberger, 

 who quotes 0. Sedgioickii as a synonym. If that be so, of course 

 this latter name would have priority ; but I am by no means sure 

 of its identity with that shell, whether as described by De Verneuil 

 or by Schnur, and am more inclined to believe it to be the species 

 attributed by Schnur and by Barrois to Leptcena interstrialis, Phillips, 

 which itself is certainly distinct from it. 



Spiriferen-sandstein of Daleiden (Sandberger). 



Fenestella Torwoodensis, n.sp. 



Some specimens, apparently of a frondose habit, have been found. 

 Their branches are slight (being much narrower than the fenestrules), 



