312 
NAUTILOIDEA. 
mesodiscus (Quenstedt), Hauer S. Quenstedti^ Hauer*, N. gahatus, 
Mojsisovics with compressed shells, and very narrow, more or less 
channelled periphery. It is singular that we meet with no such 
forms as these in the Jurassic, to connect the Triassic with the Cre- 
taceous ones. 
Horizon. Lower Greensand. 
Localities. British. Atherfield, Isle of Wight. — Foreign. Escrag- 
nolles (Var), France. 
Ilepresented in the Collection by two examples, that from Ather- 
field being the type specimen figured by Morris (Xo. 47019). 
Nautilus (Hercoglossa) Lallierianus, d’Orbigny. 
1840. Nautilus LulUerianiis, d’Orbigny, Pal«5ont. Fraii 9 ., Terr. Cr6t. 
vol. i. p. 620. 
1841. Nautilus Lallierianus, d’Orbigny, Des Couches X^oconiiennea 
Sup^rieures (Aptien) des Environs d’AuxeiTe, lle\ue Zool. Soc. 
Cuvierieune, p. 318. 
1850. Nautilus Lallierianus, d'Orbigny, Prodr. de Pal^ont. Stratigr. 
vol. ii. p. 112. 
1853. Nautilus Lallierianus, Cotteau, Moll. Foss, de TYonne (Etage 
Aptien), p. 6. 
,1858. Nautilus Lallierianus, Pictet et Renevier, Pal<5ont. Suisse, Terr. 
Apt. p. 170. 
1859. Nautilus Lallierianus, Pictet et Campiche, Description des Fos- 
siles du Terrain Crdtac^ des Environs de Sainte-Croix (Pal^onto- 
logie Suisse), ser. ii. pt. i. pp. 141, 148, pi. xix. ff. 6, a-c. 
Sp. Char. Shell very much compressed, flattened on the sides, 
with truncated and slightly channelled periphery, which is bordered 
on each side by a ridge, a fainter ridge occupying the median line. 
Umbilicus small. Aperture compressed, subtriangular, strongly 
emarginate on the dorsal side. Sejjta approximate, deeply concave, 
the sutures forming a deep sinus on the sides of the shell, and a 
very conspicuous forwardly directed lobe near the umbilicus. 
Siphuncle near the inner margin. Cast quite smooth ; test un- 
known. 
Itemarhs. This species was never flgured by d’Orbigny, who made 
N. Saxhyi, Morris, a synonym of it (Prodr. vol. ii. p. 112) ; it differs. 
^ Oeph. des Sakkammergutes, 1846, pp. 36, 37, Taf. x. ff‘. 4-6. 
^ IVeue Ceph. von Halistatt und Aussee, in Haidinger’s naturwiss. Abhandl. 
iii. p. 6, Taf. ii. ff. 1-3. 
® Das Gebirge uni Halistatt, Theil i. Abhandl. der k.k. geol. Eeichsanst. 1873, 
Band vi. p. 26, Taf. xii. f. 1, Taf. xiii. ff. 1,3. 
