310 
yArTILOIDEA. 
Another specimen (So. 74108 (h)) resembles the form figured by 
Bayle and Coquand ^ as Nautilus sejmstriatus, d’Orbigny, the evi- 
dence for such determination being, however, very imperfect, the 
principal character for distinguishing the species, viz., the peripheral 
striations, being absent in Bayle and Coquand's shell. The British- 
Museum specimen, though a very imperfect and badly preserved cast, 
shows that the shell, like Bayle and Coquand’s, was distinctly flat- 
tened on the periphery, and probably also on the sides. The septa 
are numerous, the sutures forming a broad, backwardly directed 
curve on the sides of the shell, and a distinct sinus on the periphery. 
The umbilicus must have been large, as in Bayle and Coquand’s 
Chilian Na^iliJus. The siphuncle is not seen either in the latter or 
in the British-Museum example. 
The remaining specimen {So. 74108 (r)) is a fragment of a closely 
septate and widely umbilicated shell in the same mineral condition 
as the other two, but even more imperfect, therefore no suggestions 
are offered as to its affinities. 
Horizon. Cretaceous. 
Locality. Southern Peru, near the borders of Bolivia. 
Nautilus (Hercoglossa) Saxbyi, Morris. 
1847. Nautilus Saxhinnus, Fitton, Proceed. Geol. Soc., in Quart. Journ. 
Geol. Soc. vol. iii. p. 320* (not described). 
1848. Nautilus Sa.rhii, Morris, Proceed. Geol. Soc., in Quart. .Touru. 
Geol. Soc. vol. iv. p. 193. 
1848. Nautilus Saxbii, Morris, Ann. Mag. Nat. Hist. ser. ii. vol. i. 
p. 100 (woodcut). 
1852. Nautilus Saxbii, Giebel, Fauna der Vorwelt, Band iii. Abtb. i. 
p. 137. 
1854. Nautilus Saxbii, Morris, Catalogue of British Fossils, 2nd ed. 
p. 307. 
Sp. Char. “ Shell discoidal, smooth, slightly umbilicated, with 
compressed and somewhat angular volutions, contracted towards the 
margin, with their greatest diameter near to the umbilicus ; aper- 
ture somewhat triangular [sagittate], laterally compressed, anteriorly 
truncate, posteriorly impressed or notched by the preceding volution ; 
back flat, or very slightly channelled in the middle. Septa nume- 
rous, nearly equal, the margins [sutures] very sinuous and rather 
incurved as they pass over the back ; one sinus [of the sutures] very 
large ; the other, near the umbilicus, small, the intervening saddle 
^ Mem. Soc. Geol. de France, 1851, ser. ii. vol. iv. pt. i. p. 0, pi. i. f. 4. 
