imperfectly-defined Species of Jurassic &c. Nautili. 395 



d'Arch.*, from the Eocene of Sinclli (India), with both of 

 which it agrees in the form of its sutures and the situation of 

 its siphuncle ; it is, however, a more inflated shell and 

 has a rounder periphery than either of the Indian species. 



Horizon. Inferior Oolite (Middle Brown Jura). 



Locality. Villecomte, Lothringen. 



3. Nautilus (Hercoglossd) Jrancomcus, Oppel. 

 Fig. 2. 



Nautilus (Hercoglossa) franeonicus. — a, lateral view, showing two of the 

 septa and a peculiar ridge at the base of the body-chamber ; the 

 curved line upon the cast of the latter is the anterior boundary of the 

 impression of the shell-muscle ; the test which covers the greater 

 portion of the septate part of the shell is covered with fine lines of 

 growth ; they are a little too distinct in the engraving, b, peripheral 

 view, showing the flattening of the sides and periphery. Drawn 

 from a specimen in the British Museum (no. C. 3109). Nearly two 

 thirds natural size. 



1832. Nautilus aganiticus?, Broun, in Leonhard and Bronn's Jahrbuch 



fur Mineralogie, &c., p. 70. 

 1837. Nautilus aganiticus, von Buch, Ueber den Jura in Deutschland, 



Akad. der Wissensch. p. 119. 

 1849. Nautilus aganiticus, Quenstedt, Die Cephalopodeu, p. 58, tab. ii. 



fig. 6 (not of Schlotheim). 

 1865. Nautilus franconicus, Oppel, Die Tithonische Etage, Zeitschr. 



der deutsch. geol. Gesell. Band xvii. p. 546. 

 ? 1865. Nautilus strambergensis, Oppel, ibid. 

 ? 1868. Nautilus strambergensis, Zittel, " Die Cephalopodeu der Strain - 



berger Schichten,'' in Oppel and Zittel's ' Palaeontologische Mittheil- 



ungen,' Band i. Abth. ii. p. 42, Atlas, tab. ii. figs. 8- 1 1. 



* 'Description des Auimaux Fossiles du Groupe Nummulitique de 

 l'lnde,' 1854, livr. ii. p. 337, ( A . Deluci ) pi. xxxv. figs. 2, 2 a ; (N. Forbesi) 

 pi. xxxiv. figs. 12, 12 a. 



28* 



