CYR rOCERATlD^. 
317 
1849. Campidites suhventricosus, d'Orbigny, Prodr. de Pal^ont. Stratigr. 
vol. i. p. 56. 
1852. Phragmoceras subve^itricosum, Giebel, Fauna der Vorwelt, Band 
iii. Abtb. i. p. 211. 
1853. Cgrtoceratites suhventricosus, Steininger, Geogn. Beschreib. der 
Eifel, p. 41. 
Sj). Char. The following is the description of this species given 
by d’Archiac and de Yerneuil : — “Shell in the form of a slightly 
elevated cone, compressed upon the sides and slightly arched so as 
to present only half a volution when the shell is complete. Septa 
slightly concave, elliptical, having their greater diameter between 
the back and the ventral part, and being also a little sinuous ante- 
riorly on the dorsal region. Chambers two and three times higher 
dorsally than ventrally. Siphon ventral [i. e. internal], very near 
the edge, and madreporiform.” 
Bernards. I can discover no character by which to separate 
Schlotheim’s species from the one described by d’Archiac and de 
Yerneuil {loc. cit.), and therefore the name bestowed by these authors 
must give place to that of Schlotheim. 
The example in the National Collection, which, like the one 
figured by d’Archiac and de A'^erneuil, is a cast, is marked with 
obscure longitudinal ridges. These are of sufficient prominence to 
justify the conclusion that they must have formed a distinguishing 
feature in the ornamentation of the test of this species, and we do 
in fact find such ornaments in the example figured by Schlotheim. 
There is thus good ground for estabhshing the identity of the 
two species, especially as they agree perfectly in all other characters. 
The name Jlexuosum is not inappropriate, when applied, as it pre- 
sumably was, to the septa, which are conspicuously bent or arched 
forward. 
Horizon. Middle Devonian. 
Locality. Gerolstein, Eifel. 
Represented in the Collection by a single example. 
Cyrtoceras? fimbriatum, Phillips. 
1841, Cyrtoceras Jimhriatum, Phillips, Pal. Foss, of Cornwall, Devon, 
and West Somerset, p. 114, pi. xliv. f. 214. 
1842, Cyrthoceratitesjimhriatus, d’Archiac & de Yerneuil, Trans. Geol. 
Soc. ser. 2, vol. vi. p. 386. 
1849. Cyrtoceras Jimhriatus, d’Orbigny, Prodr. de Paleont. Stratigr. 
vol. i. p. 53. 
1852. Cyrtoceras jimhriatum, Giebel, Fauna der Yorwelt, Band iii. 
Abth. i. p. 206. 
