70 DEVONIAN FAUNA. 



our shell (whicb may be taken as identical with B. hisulcatus) as a variety of 

 Sowerby's species. 



At the same time the B. tumidus of Kayser, and perhaps also that of Beushausen, 

 must, from their defined keel, be regarded as distinct, though there is possibly 

 more reason for retaining B. trilohatus, var. tumidus, Sandberger, as a variety of 

 Romer's shell. 



Affinities. — De Koninck's three Carboniferous species of the genus are all 

 distinguished by elaborate ornament. 



B. compressiis, Sandberger,^ which is the same as B. Murchiso7ii, d'Orbigny,* 

 has a striated keel and no lateral concavities. 



4. Genus or Sub-genus — Euphbmus, M'Coy, 1844 



This genus was formed by M'Coy, and revived by Waagen and de Koninck, for 

 shells of the type of Belleroplion Urii, Fleming. It appears individualised by 

 several definite characters, among which may be mentioned the nature of the 

 ornament, which de Koninck seems to regard as produced by the animal only on 

 the old parts of its shell, and as taking the place of the smooth callosities seen in 

 those parts in other genera of the family. The sinus-band is often well marked in 

 the newer part of the shell, but is more or less obliterated in the striated portion. 



De Koninck describes five species from the Carboniferous of Belgium, all of 

 which seem very closely allied. 



1, EuPHEMUS Baeumensis, n. sp. Plate VII, fig. 2. 



1841. Belleeophon Ukii, PUllips (not Fleming). Pal. Fobs., p. 106, pi. xl, 



figs. 199 a—d. 

 184-3. — — ?, -P. A. Eomer. Verst. Harzgeb., p. 32, pi. xii, fig. 38. 



Description. — Shell very small, globose. Whorls evenly and spherically 

 rounded, and transversely symmetrical, bearing about twenty fine, regular, 

 simple, erect, very distant spiral lines, which are most distant at the centre of the 

 back, and seem to vanish at the apex and umbilicus. Interspaces flat. Shell- 

 structure massive. 



Size. — About 4 mm. high, 5 mm. wide. 



Locality. — In the Museum of Practical Geology is a specimen from Baggy 

 Point, which is the original of Phillips's fig. 199 h. 



1 1853, Sandberger, ' Verst. Khein. Nassau,' p. 180, pi. xxii, figs. 6—6/ 



' 1840, De Ferussac and d'Orbiguy, ' Hist. Nat. Ceph., p. 210 (Bellerophon), pi. vii, figs. 1—3. 



