286 



Messrs. Foord and Crick on new and 



Horizon. Inferior Oolite. 



Localities. Dundry, Somersetshire; Sherborne, Halfway 

 House, Dorsetshire. 



14. Nautilus perinflatus, sp. nov. 

 Fier. 15. 



Ms^' 



Nautilus jm-inflatus. — a, lateral view of septate part of the shell, showing 1 

 the small umbilicus, with a portion of the test; b, front view, show- 

 ing the position of the siphuncle. Drawn from a specimen in the 

 British Museum (no. 18398). Rather more than one third natural 

 size. 



Sp. char. Shell much inflated, very slightly flattened on 

 the sides ; peripheral area scarcely defined. Whorls semi- 

 lunate in section, rather more than twice as wide as high, 

 deeply embracing. Umbilicus very small. Septa rather 

 approximate ; sutures slightly curved on the sides of the 

 shell and forming a shallow sinus on the periphery. Siphuncle 

 near the inner margin. Test thick, marked only with lines 

 of growth. 



Remarks. This species closely resembles the N. subinflatus 

 of d'Orbigny *, but differs in the position of its siphuncle and 

 the greater size of the shell. Moreover, the examples upon 

 which d'Orbigny's species was founded were obtained from 

 the Kimmeridge Clay of Chatelaillon, near Rochelle (Cha- 

 rente-Inferieure), Honfleur (Calvados), and other localities, 

 whereas the English specimens are from the Inferior Oolite 

 of Bradford- Abbas, Dorsetshire, and Bristol. 



* Prodr. de Paleont. Stratigr, 1850, vol. ii. p. 43 ; this species was 

 originally called injtatus (Paleont. Franc., Terr. Jurass. 1842, vol. i. 

 p. 105, pi. xxxvii.). 



