40G 



Messrs. Foord and Crick on new anil 



the ventral or peripheral side. The septa are moderately 

 distant, being about 7 lines apart where the height of the 

 whorl is \\ inch. The sutures are slightly bent backwards 



Nautilus Bayfieldi. — a, lateral view of a specimen, showing the umbilicus 

 and the ribs ornamenting the test ; b, peripheral view of another 

 specimen, showing sutures (s) and ribs. Drawn from specimens in 

 the British Museum (a, no. C. 3103 ; b, no. C. 3102), about two 

 thirds natural size. 



on the sides of the shell and form a shallow sinus on the 

 periphery. There appears to be an inner lobe. The siphuncle 

 is situated a little below the centre. The test is ornamented 

 with numerous acute transverse ribs or plications, separated 

 from each other by spaces about equal to their own width. 

 The ribs form a deep sinus in crossing the periphery. 



Remarks. This species is closely allied to Nautilus patens, 

 Kner *, from which, however, it differs in its more com- 

 pressed whorls, smaller umbilicus, and the position of its 

 siphuncle, which is below instead of being above the centre. 

 The present species bears some resemblance to Nautilus Des- 

 longchampsianuS) d'Orb.f ; but the latter has a more inflated 

 shell, a distinctly angular umbilical border, and longitudinal 

 as well as transverse ornaments. 



* ' Yersteinerungen des Kreidemergels von Lemberg und seiner Um- 

 gebung,' p. 7, tab. i. figs. 2, 2 a. See also Dr. Clemens Schliiter, "Cepha- 

 lupodt n tier oberen Deutschen Kreide," in Palseontographica, Band xxiv. 

 Lief. 1, April 187G, p. 178, Taf. 1. 



t Taleout. Francaise (TVrr. Cr£t.), vol. i. p. 00, pi. xx. 



