Description of the Fossils in the older Deposits of the Bhenish Provinces. 353 



from that, as well as from the C. ornata, in having its pretty distinct folds continuous throughout the 

 breadth of the faces ; in their meeting upon the margins of the angles without uniting ; and in the trans- 

 verse grooves being covered with very fine, very regular, very close-set perpendicular striae, which are 

 only perceived with a magnifying glass. They differ also decidedly from the little folds which are ob- 

 servable upon certain varieties of the C. quadrisulcata. The upper part of the shell is rounded into a 

 vaulted form, and the ribs are granular and more close-set than upon the middle of the faces. To avoid 

 all confusion relative to this species, we have given a figure of it. 



The Conularia, of which we now know ten species, are found in all the strata below the coal, and even 

 in the coal beds, but it is easy to see that the species of this genus have been but ill determined down to 

 the present time, or rather that they have all been referred to the C, quadrisulcata of the Mineral Con- 

 chology, and because characters which belonged to the genus have been regarded as specific. It is only 

 needful to compare the figures given by Bronn (Leth. Geog. Taf. I. f. 12.) and Hisinger (Leth. Suec. 

 Tab. X. f. 4.) with those in the Mineral Conchology (Tab. CCLX.) to ascertain that they cannot all be- 

 long to one species. The figure in Lethcea Geognostica represents the C. pyramidata of May (Calvados), 

 where it is common. A second, rectangular, more elongated species, covered with extremely fine striae, is 

 found, but very rarely in the same locality. The Conularia of Sweden appears to belong also to the C. pyra- 

 midata. And lastly, we know still another small species from St. Petersburgh, and one from North America. 



We have not been able to recognize in any of the specimens which we have examined, the two siphon- 

 like depressions mentioned by J. Sowerby (Sil. Syst. p. 627), and we think, the family to which it seems 

 these shells ought to be referred, precludes the idea of the existence of such a character. 



1. Bellerophon striatus, de Fer. et d'Orb. Monograph, des Cephal., PI. VII. f. 6, 7. (non Sow. Sil. Syst. ; 



non Bron. Leth. Geog., non Phil. Pal. Fos.), B. undulatus, Goldf. Bonn Museum, Tab. nost. 

 XXVIII. f. 6. 



Shell nautiloid, globular, umbilicated ; umbilicus small and deep. Aperture very large, transversely 

 dilated, arched and semilunar. Shell thick, covered with transverse, rugose, pliciform and undu- 

 lated striae, converging on one side toward the umbilicus, and terminating on the other at a central 

 keel near to which they turn backward. The folds are wider and more prominent as they approach 

 the aperture. The keel is flattened and formed by striae of growth of which the concavity is turned 

 toward the aperture. These striae indicate the successive formation of the notch which corresponds 

 to the middle of the right lip. 



M. d'Orbigny regards this species as identical with the B. undulatus of Goldfuss. 



Paifrath ; rare. 



2. Bellerophon tuberculatus, de Fer. et d'Orb., loc. cit. supra, PI. VIII. f. 7-10. Tab. nost. XXVIII. f. 9. 



Shell very globular ; aperture transverse. The shell covered with fine and regular granulations inter- 

 rupted upon the central keel. 

 We have met with only very incomplete specimens of this species. 

 Eifel; Paffrath. 



3. Bellerophon Murchisoni, de Fer. et d'Orb., loc. cit. supra, PI. VII. f. 1,2, 3. {B. striatus. Sow. Sil. 



Syst. PI. III. f. 12. e.) Tab. nost. XXVIII. f. 7, 7 a, 7 h. Var. fig. 8. 



We have represented this shell, which is already figured in Murchison's work under the name of B. 

 striatus, because it is a species common to the Devonian and the Silurian systems, being found not only 

 in the old red sandstone of England, but also in the slates of Wissenbach, which represent the upper 

 part of the Silurian system on the banks of the Rhine. 



The variety, fig. 8, is distinguished by its more distinct keel. The back does not show any flattened 



