128 
NAUTILOIDEA. 
1843. Orthoceras Frieslebense, Klipstein, Beitr. zur geolog. Kenntn. 
der ostliclien Alpen, p. 143, Taf. ix. f. 4. 
1849. Orthoceras elegans, Quenstedt, Die Oephalopoden, p. 478, Taf. 
xxxi. ff. 3-5. 
1849. Orthoceratites elegans, d’Orbigny, Prodr. de Paleont. Strati- 
grapbique, vol. i. p. 179. 
? 1851. Trematoceras (^Orthoceras) elegans, Eichwald, Naturbist. 
Bemerk. als Beitrag zur vergleicbenden Geognosie, Nouv. 
de la Soc. des Naturalistes de Moscou, vol. ix. p. 124, Taf. i. f. 3. 
1852. Orthoceras elegans, Giebel, Fauna der Vorwelt, Band iii. p. 234. 
1869. Orthoceras elegans, Laube, Fauna der Scbicbten von St. Cassian, 
Denkscbr. d. k. k. Akad. d. Wiss. Band xxx. p. 59, Taf. xxx\-i. 
f. 9. 
1877. Orthoceras elegans, Barrande, Syst. Sil. de la Boheme, vol. ii. 
Texte V. p. 1324, pi. cccclxxxviii. case ix., and Suppl^m. p. 65, 
pi. cccclxxxiii. ff. 4-15. 
1882. Orthoceras elegans, Mojsisovics, Die Cepbalopoden der Mediter- 
ranen Triasprovinz, in Abbandl. der k. k. geologiscb. Reicbsanst. 
p. 291, Taf. xcii. ff. 10-12. 
Char. Apical angle about 5° to 5°-5. Distance of septa variable, 
but less than tbe diameter of the preceding septum. Section circular, 
though somewhat elliptical in consequence of pressure. Siphuncle 
central. The shell is furnished with sharply defined, irregularly 
spaced transverse striae, which are often entirely wanting. The 
initial point has been described and figured by Barrande. Eichwald 
took Orthoceras elegans as the type of his new genus Trematoceras, 
which he distinguished from Orthoceras by the fact that the si- 
phuncle showed no continuous tube. Orthoceras elegans agrees sub- 
stantially in its characters with 0. campanile [Mojsis.], but as yet 
only very small examples have been found of it, of which many are 
provided with remains of the body-chamber, as observed by 
Quenstedt. A large example of Orthoceras elegans may yet be found 
in the St. Cassian beds, as happened in the case of Orthoceras politum, 
so that Orthoceras campanile [Mojsis.] could then no longer be con- 
sidered as a valid species. (Mojsisovics, loc. cit.) 
Horizon. Trias ; Cassianer Schichten (St. Cassian Beds). 
Locality. St. Cassian, South Tyrol. 
Represented in the Collection by several imperfect fragments. 
