88 
NATJTILOIDEA. 
A fragment of the septate portion of the shell. The septa are 
very close, their distance only slightly exceeding 1 line, where the 
shell has a diameter of 8 lines. The rate of tapering is about 1 
in 5. The section is circular. ]N'othing can be seen of the siphuncle, 
and the shell is not preserved. 
Horizon. Middle Devonian (Great Devon Limestone). 
Locality. Newton Abbot, Devonshire. 
Orthocerasj sp. 
This is an interesting fragment of a cylindrical (?) shell, partly 
buried in a highly crystalline limestone matrix. Portions of the 
test are well preserved, the ornaments consisting of transverse, 
acute riblets, varying from | to 1 line distant from each other. 
The summit of each riblet presents a double line so as to give a 
banded appearance to the test, somewhat resembling that of Ortlio- 
ceras hicingulatum^ G. & F. Sandb. The riblets have an obliquity 
of about 15*^ to the longitudinal axis of the shell. Neither septa 
nor siphuncle are preserved. 
Horizon. Middle Devonian (Great Devon Limestone). 
Locality. Torquay, Devonshire. 
Presented by J. E. Lee, Esq., F.S.A., F.G.S, 
Orthoceras typns, Saemann. 
1854. Orthoceras typus, Saemann, Ueber die Nautiliden, in Palaeon- 
tographica, Band iii. p. 164, tab. xx. flP. 1, a-e. 
Sjo. Char. Shell straight. Section circular. Bate of increase 
about 1 in 12. Dimensions of body-chamber not precisely ascer- 
tainable. Septa rather remote, about the diameter apart. Siph- 
uncle slender, cylindrical, slightly eccentric. Surface of the test 
with irregular transverse striae of growth. 
Horizon. Schistes de Couvin (Eifelien) ; Middle Devonian. 
Localities. Nismes, Boussu en Fagne, Belgium. 
Bepresented by two fairly good specimens transferred from the 
Museum of Practical Geology. 
Orthoceras crebrum, Saemann. 
1854. Orthoceras crehrum, Saemann, Ueber die Nautiliden, in Palaeon- 
tograpliica. Band iii. p. 165, tab. xx. ff. 2, a, b, c. 
1856. Orthoceras planiseptatuin^ G. & F. Sandberger, Die Verstein. 
Nassau, p. 160, Taf. xvii. ff. 4, 4 a-i. 
1884. Orthoceras planiseptatum, Kayser, Jahrb. d. konigl. preussisch. 
geolog, Landesanst. und Bergak. zu Berlin f. d. Jahr 1883. 
