394 Messrs. Foord and Crick on new and 



cus very small or perhaps closed. Septa wide apart, being 

 9 lines distant from each other where the height of the whorl 

 is 2 inches. Sutures strongly arched forward after leaving 



Fiar. 1. 



Nautilus (Hercoglossa) aganiticus. — a, lateral view of an imperfect speci- 

 men, showing the deeply lobed sutures ; b, view of the septum 

 which faces the letter a in the other figure, showing the position of 

 the siphuncle. Drawn from a specimen in the British Museum (uo. 

 C. 3173). A little more than one half natural size. 



the umbilicus, then sweeping backward in a larger curve, 

 and again forward towards the periphery, which they cross 

 without forming any sinus. Siphuncle situated a little below 

 the centre. 



Remarks. This species was long confounded with another 

 from a higher horizon (the Tithonian), afterwards designated 

 by Oppel franconicus*. The present species is now re- 

 stricted to a form found in the Eisenoolith of Villecomte, in 

 Lothringen (Lorraine) f. N. aganiticus is easily distinguished 

 from A 7 , franconicus by its much more inflated form, rounded 

 periphery, somewhat less flexuous sutures, and the position 

 of its siphuncle. In its general form, especially in the rounding 

 of the periphery, this species bears a much closer resemblance 

 to Nautilus (Hercoghssa) portla?idicus 7 which, however, 

 differs in the form of its sutures. It has perhaps also some 

 relationship with N. Forbesi, d'Archiac, and N. Deluci, 



* Oppel, " Die Tithonische Etage," Zeitschr. der deutsch. geol. Gesell. 

 Band xvii. 1865, p. 546. 



t Ziltel, " Die Cephalopoden der Stramberger Schichten," in Oppel and 

 Zittel's ' Palseontologische Mittheilungen,' Band i. Abth. ii. 1868, p. 43. 



