316 
NAUTILOIDEA. 
Cyrtoceras (Ooceras) superbmn, Barrande, sp. 
1867. Cyrtoceras superhum, Barrande, Syst. Sil. de la Boheme, vol. ii. 
pt. i. p. 623, pi. cxxviii. 
Sp. Char. Shell strongly and uniformly curved throughout its 
whole length. Upon a chord of 75 millim., subtending the concave 
side of a very incomplete specimen, the highest perpendicular is 20 
millim. Some specimens, however, are less strongly curved. The 
transverse section is oval, of which the smaller end corresponds 
with the convex side. The ratio of the ventro-dorsal axis is to tlie 
transverse axis as 3 : 2 at the smaller end of the shell, but at the 
other extremity it is as 11 : 10, but the oval character is always 
maintained. The form of the section in different individuals differs 
considerably, the ratio of the two axis being as 9 : 7 in one of tbe 
specimens figured by Barrande (pi. cxxviii. f. 3), while in the other 
it is as 19 : 17 (f. 6). The length of the bod}’-chamber rather 
exceeds the diameter of the aperture, and occupies about ^ of the 
total length of the shell. The septa are very numerous, and increase 
regularly in their distance from each other throughout | of the 
septate part of the shell, after which they again diminish in distance 
towards the body-chamber. The space which separates them is not 
more than of the ventro-dorsal diameter. The siphuncle is 
situated close to the convex border of the shell, but without coming 
in contact with the test. The latter is known only by a few trans- 
verse striae upon the internal cast of the shell ; there are also a few 
obscure longitudinal ridges observable upon some specimens. 
Hemarhs. This species is sufficiently distinguished from its con- 
geners by its general proportions and by its transverse section. 
Horizon. Etage E ( = Salopian). 
Locality. Dworetz, Bohemia. 
Fairly well represented in the Collection. 
DEVONIAN SPECIES. 
Ehdogastric. 
Cyrtoceras (Ooceras) ilexuosTim, Schlotheim, sp. 
1820. OrtJioceratites Jlexuosus, Schlotheim, Petrefactenkunde, p. 52. 
1822. OrtJioceratites jlexuosus, Schlotheim, Nachtrage ziir Petrefacten- 
kimde, Abth. i. p. 58, Taf. viii. f. 1. 
1842. Phragmoceratites suhventricosus, d’Archiac k de Verneuil, Trans. 
Geol. Soc. ser, 2, vol. vi. p. 351, pi. xxx. ff. 1, 1 n. 
