NATJTILID.E. 
251 
1883. Nautilus Neocojtiie/isis, Leenhardt, Etude Geologiqiie de la 
Region du Mont Ventoux, p. 56. 
1890. Nautilus Neocomiensis, Foord and G. C. Crick, Ann. & Mag. 
Nat. Hist. ser. 6, xol. v. p. 400. 
[Ao^ 1853. Nautilus Neocomiensis, Sharpe, Description of the Fossil 
Remains of Mollusca found in the Chalk of England, pt. i. Cepha- 
lopoda (Mon. Pal. Soc.), p. 15, pi. v. ti‘. 3,«-c.] 
S/). Char. “ Shell compressed at the sides, with a narrowly 
rounded periphery. Umbilicus of moderate size, and exhibiting the 
inner volutions. Transverse section of the whorls wider than high. 
Septa very shghtly curved upon the sides, and forming a slight 
sinus upon the periphery. Siphuncle placed a little below the 
centre. Ornaments of the test consisting of numerous, prominent, 
obtuse ridges, separated by interspaces about half their own width. 
These iddgcs are about 2 lines wide on the periphery, where they 
form a deep, narrow, backwardly-directed sinus. 
liemarlcs. “ This species differs from N. radiatus by its more com- 
pressed form and the much finer ornaments of the test. Moreover, 
N. Neocomiensis is stated by d’Orbigny to have been found only in 
the middle beds of the Neocomian, while N. radiatus was peculiar 
to the Craie glauconieuse (‘ Craie chloritee ’ of d’Orbigny and the 
older authors), none being found in the intermediate beds. 
‘UY. squamosus, Lange (Schlotheim), and N. Varusensis, d’Orbigny, 
are placed in the synonymy of the present species on the authority 
of MM. Pictet and Campiche. Of the former those authors affirm 
that Quenstedt was quite in error in supposing it to be identical 
with the Neocomiensis of d’Orbiguy, the N. squamosus of Lange 
being a smooth species from the Jurassic rocks of the neighbourhood 
of Baden. Of the latter {N. Varusensis) the same authors remark 
that the short description given of it by d’Orbigny indicates no 
appreciable difference between it and Neocomiensis.” {Foord and 
6r. C. Crich.) 
A fine example of this species from the typical locality (Escrag- 
nolles) gives the following measurements : — greatest diameter about 
7 inches ; greatest breadth about 4| inches. 
Horizon. Neocomian. 
Localities. Grasse, Escragnolles (Var), France ; Neuchatel, High 
Alp (Sentis), Appenzell, Switzerland. 
Well represented in the Collection. 
