92 
NATJTILOIDEA . 
Orthoceras lineare ?, Munster. 
(Ante, p. 89.) 
/Sp. Char. Shell straight, compressed. Section elliptical. Rate 
of increase about 1 in 8. Septa approximate, distant about the 
diameter. Siphuncle apparently subcentral. Surface marked with 
very line, transverse, raised lines, about 10 in the space of 1 line. 
Horizon. Goniatiten-Kalk ; Upper Devonian. 
Locality. Adorf, Waldeck. 
Represented in the Collection by an imperfect specimen. 
Orthoceras subflexuosum ?, Munster. 
1840. Orthoceratites suhjlexuosus, Munster, Beitrage zur Petrefacten- 
kunde, Heft hi. p. 100, Taf. xix. f. 9, a, h. 
1854. Orthoceras subflexuosum? , Roemer, Palaeontographica, Band iii. 
p. 27, Taf. iv. f. 13. 
1879. Orthoceras suhjlexuosum, Giimbel, Geogn. Beschreib. des Fich- 
telgebirges, in Geogn. Beschreib. des Konig. Bayern, Abth. iii. p. 498. 
8p. Char. Shell straight. Section elliptical. Rate of increase 
very slow. Septa approximate. Siphuncle submargiiial Surface 
with distant, wavy, transverse lines, about \ line distant from each 
other. 
Horizon. Goniatiten-Kalk ; Upper Devonian. 
Locality. Oberscheld, Nassau. 
Represented in the Collection by several somewhat imperfect 
specimens ; some of which were presented by J. E. Lee, Esq., F.S.A., 
F.G.S., and others transferred from the Museum of Practical 
Geology. 
Orthoceras compressum, F. A. Roemer. 
1843. Orthoceratites co7npressuSy F. A. Roemer, Die Verstein. des 
Harzgebirges, p. 36, Tab. x. f. 7. 
1854. Orthoceras coinpressum, F. A. Roemer, Palaeontographica, Band 
iii. p. 110. 
1856. Orthoceras compressum, G. & F. Sandberger, Die Verstein. Nassau, 
p. 158, Taf. xviii. ff. 1, 1 a-d. 
Sp. Char. Shell straight, compressed. Section elliptical, the ratio 
of the two diameters being as 2 : 3. Rate of increase very slow. 
Septa strongly arched, somewhat drawn down at each side. Siphuncle 
submarginal. Surface quite smooth. 
EemarJcs. This species is nearly related to the preceding one, 
but the surface ornamentation of 0. subflexuosum serves at once to 
distinguish it from 0. compressum, which is quite smooth. 
