ORTHOCERATIDJE. 
41 
Orthoceras Griffith! ?, Haiighton 
1858. Orthoceras Griffithi, Ilaugliton, in Captain M^Clintock’s Eemi- 
niscences of Ai'ctic Ice-Travel in Search of Sir John Franklin, 
Journ. Royal Diibhn Soc. vol. i. p. 239, pi. v. f. 1, 
Sp. Char. Section circular, very slowly tapering. Septa distant 
about i the diameter. Length of the body-chamber apparently about 
3 times the basal diameter. Siphuncle very eccentric, about along 
the diameter. Surface marked with fine, close-set, thread-like lines 
or riblets, about 12 in the space of 1 line. 
Bemarl's. The position of the siphuncle in this species is described 
by Professor Haughton as central, but as the specimen figured by 
him is a longitudinal section, he may have been misled upon this 
point. In other respects the specimens in the N'ational Collection 
agree perfectly with 0. Griffithi. 
“ This fossil was found in great abundance at Griffith’s Island, 
where Captain Austin’s squadron wintered. It difiers from all the 
Orihocerata described by Mr. Salter in Sutherland’s Voyage and I 
have named it after Mr. Griffith, the founder of Irish geology ” 
{Haughton). 
The geological horizon of the rocks of Griffith’s Island, whence 
the present species was obtained, appears to have been well estab- 
lished, the fossils being “of a decidedly Upper Silurian type.” 
Horizon. Silurian (Wenlock?). 
Locality. Griffith’s Island, Barrow Strait, Arctic America. 
Two somewhat imperfect specimens. 
Orthoceras faustulum, Barrande. 
1870. Orthoceras famtulum, Barrande, Syst. Sil. de la Boheme, vol. ii. 
Texte iii. 1874 (janvier), p. 504, pi. ccccix. ff. 11-13. 
1878. Orthoceras sp., Bayle, Explication de la Carte G4ol. de la 
France, tom. iv. Atlas, premiere partie, pi. xxxiv. ff. 1, 2. 
Sp. Char. Section somewhat oval. Rate of increase 1 in 6. Septa 
close together, distant about yt the diameter. Body-chamber un- 
known. Siphuncle very slightly eccentric, so that the central axis 
of the shell is touched by its border. Surface ornamentation con- 
sists of very fine and regular transverse striae with an obliquity of 
about 15°. 
Horizon. Calcaires ampeliteux ( = Third Fauna of Barrande). 
Locality. Feuguerolles (Calvados), France. 
Represented by two fine specimens. 
^ Journal of a Voyage in the years 1850-1851, in search of the missing 
crews of H.M. ships ‘Erebus ’ and ‘Terror.’ By Peter 0. Sutherland, M.D. 
