ORTHOCEEATID.E. 
89 
S}). Char. Shell straight. Section elliptical, the ratio of the two 
diameters being as 15 : 18. Eate of tapering about 1 in 5. 
Dimensions of the body-chamber unknown. Septa distant about 
g the diameter. Siphuncle slender, eccentric in position, varying 
from f to 5 along the shorter diameter. Surface of test quite 
smooth. 
Hemarl's. Finding no characters of sufficient importance to sepa- 
rate 0. pJaniseptatum from 0. crehrum, I have united these two 
species under Saemann’s name, which has the priority over that of 
the Brothers Sandberger. A specimen from the Ardennes, consisting 
of a cast of the apical portion of the shell, is probably identical 
with this species. 
Horizon. Stringocephalen-Kalk ; Middle Devonian. 
Locality. Gerolstein, Eifel. 
Fairly well represented in the Collection by examples presented 
by J. E. Lee, Esq., F.S.A., F.G.S. 
Orthoceras arcuatelltim, G. & F. Sandberger. 
1856. Orthoceras arcuate llioyi, G. & F. Sandberger, Die Verstein. 
Nassau, p. 166, Taf. xix. ff. 2, 2 a-y. 
Sp. Char. SheU straight, short. Section circular. Eate of 
tapering very rapid, about 1 in 3. Septa direct, distant about g 
the diameter. Siphuncle slender, central. Surface ornamented 
with transverse undulating strim, from four to five in the space of 
1 line, their distance increasing with the growth of the shell. 
Horizon. Stringocephalen-Kalk ; Middle Devonian. 
Locality. Buntenbock, North-west Hartz. 
Eepresented by one imperfect specimen. 
Orthoceras lineare ?, Miinster. 
1840. Orthoceratites linearis, Miinster, Beitrjige zur Petrefactenkunde, 
Heft iii. p. 99, Taf. xix. f. 1, «, b. 
1854. Orthoceras lineare, F. A. Eoemer, Palaeontographica, Band iii. 
p. 17, tab. iii. f. 23. 
1879. Orthoceras lineare, Giimbel, Geogn. Beschreib. des Fichtelge- 
birges, in Geogn. Beschreib. des Konig. Bayern, Abth. iii. p. 498. 
^p. Char. This species is characterized by its exceedingly fine 
transverse strim. The septa are distant about g the diameter. The 
siphuncle is central. 
RemarTcs. The specimen in the Collection from the Middle Devonian 
bearing this name resembles Eoemer’s form more nearly than 
Munster’s, which is a much more robust shell, though this may 
be only a question of growth. 
