76 
NATJTILOIDEA. 
Differs from the species odI}' in the absence of punctures in the 
longitudinal grooves, and in having the surface of the longitudinal 
bands striated transversely. 
RemarTcs. A form resembling this was found by M. de Yerneuil 
in the black limestones of Ogasa, Province of Gerona (Spain). L. 
Mallada also cites it as occurring in Spain, in association with 
0. placiclum, Barr., and 0. tumidum, Barr. ^ 
Horizon. Etage E, bande e 2 (= Salopian), 
Localities. British. Church Hill, AVorcestershire (presented by 
J. E. Lee, Esq., E.S.A., F.G.S.). — Foreign. Karlstein, Kosorz, 
Bohemia. 
AYell represented in the Collection. 
Orthoceras strix, Hall and AVhitfield. 
1875. Orthoceras strix, Hall and Whitfield, Geol. Surv. of Ohio, 
vol. ii. pt. 2, Palseont. p. 149, pi. ix. f. 3. 
Sp, Char. Shell rather large. Sectioii elliptical. Hate of 
increase 1 in 6. Body- chamber unknown. Septa distant about ^ 
the diameter. Siphuncle slightly eccentric. Surface of cast marked 
with strong longitudinal ribs, with slightly concave interspaces, 
giving a fluted appearance to the shell. The ribs are 34 lines 
distant at a diameter of 25 lines. Four or five longitudinal riblets 
occupy the interspaces, but no transverse strim have been observed. 
Remarhs. 0. strix differs from 0. co?i«mnrtre, HalP (^non Marklin), 
in having loss numerous ribs or flutings, and in its rate of tapering, 
which is more rapid than any of the forms referred to that species. 
From 0. Cadmus, Billings^, it differs in its elliptical section, 
bolder and less numerous flutings, and also in the flner surface 
ornaments, which in that species consist of “ fine, transverse 
engirdling striae,” which are more distinct than the longitudinal 
ones. In most of their characters, however, the two species come 
very near to each other. 
Horizon. Niagara Formation ( = AA"enlock). 
Locality. Wabash, Indiana. 
Bepresented in the Collection by a fine specimen. 
Orthoceras Darwini, Billings. 
1862. Orthoceras DarWini, Billings, Palaeozoic Fossils, vol. i. p. 161. 
1875. Cyrtoceras Myrice, Hall and AYhitfield, in Geol. Snrv. of Ohio, 
vol, ii. pt. 2, p. 149, pi. viii. f. 9. 
^ Bol. Com. del Mapa Geol. de Espana, 1875, tom. ii. p. 25. 
Hall, 18th Beg. Rep. 1867, p. 351, pi. xix. ff. 4, 5, 6, 8. (The name is 
pi’eoccupied, vide Boll, Archiv fiir Mecklenburg, xi. Jahrg. p, 16, Taf. i. f. 3.) 
8il, Foss. Anticosti, 1866, p. 83. 
