66 DEVONIAN FAUNA. 



few characters that it is impossible to be sure about their right position. On the 

 whole it seems most likely that they belong to a discoidal form of BeUeropJiov. 



Affinities. — From B. compressus, Sandberger/ which is the same as B. Mur- 

 chisoni, d'Orbigny,^ it differs by having flatter sides and a more convex back. 



B. Troostii, d'Orbigny,^ is very similar on the back, but much deeper. 



In B. capuloides, Maurer,* a sinus-band is visible. 



On the other hand, Gapulus immersus, Barrande,^ G. contortus, F. A. Komer,® 

 and Giebel,''' G. gracilis, Sandberger,^ approach it in shape, but their spires do not 

 seem in any case so regular and complete. 



While, again, species of Goniatites often closely resemble it, it does not seem 

 worth while to compare it with any of them in the absence of any indication of 

 septa or suture-lines. 



2. Genus or Sub-genus — Salpingostoma, F. Bomer, 1876. 



This genus is distinguished by having an interrupted or evanescent sinus- 

 band, a very wide open umbilicus, and a very widely and rapidly expanded simple 

 mouth. 



1. Salpingostoma? macromphalus, F. a. Bomer, sp. P Plate VIII, figs. 4, 4 a, 5, 5 a. 



1843. Bellerophon macromphalus, F. A. Burner. Verst. Harzgeb., p. 32, 



pi. ix, figs. 3, 3 a. 

 ? 1844. — MACiiosTOMA, F. Homer. Ehein. Uebergangsgeb., p. 80, 



pi. ii, figs. 6 a, b. 

 ? 1853. — — Sandberger. Verst. Ehein. Nassau, p. 182, 



pi. xxii, figs. 8, 8 «, 4 5. 

 ? 1876. Salpingostoma macrostoma, F. Bomer. Pal. Letb., pi. xxv, figs. 5, 5 a. 

 1884. Belleeophon MACROMPHALrs, BeusJiauspn. Abhandl. Geol. Specialk. 



Preuss., Band vi, pt. 1, p. 44, pi. ii, 

 fig.l. 



^ 1853, Sandberger, 'Verst. Ehein. Nassau,' p. 180, pi. xxii, figs. 6—6/ 



2 1840, de Ferussac aud d'Orbigny, 'Hist. Nat. Ceph.,' p. 210, (Bellerophon) pi. vii, figs. 1—3, 

 and pi. viii, fig. 14. 



s Ibid., p. 206, (Bellerophon) pi. vii, figs. 19, 20. 



* 1880, Maurer, ' Neues Jahrb. f. Min.,' Beil.-Band i, p. 31, pi. ii, fig. 7. 



5 Ibid., p. 33, pi. ii, fig. 15. 



« 1843, F. A. Eomer, ' Verst. Harzgeb.,' p. 26, pi. vii, figs. 1, 2. 



7 1858, Giebel, ' Sil. Faun. Tnterharz.,' p. 24, pi. iii, fig. 7. 



^ 1853, Sandberger, 'Verst. Ehein. Nassau,' p. 236, pi. xxvi, figs. 17, 11 a. 



