2S8 



Messrs. Foovd and Crick on new and 



is the subangular border of the umbilicus. In this last 

 feature and also in the wide and semilunate section of the 

 whorl this species resembles Nautilus excavatus * ; but the 

 latter has a much larger umbilicus and closer septa. It may 

 also be compared with N. Malherbi, Terquem f ; but the 

 latter is at once distinguished by its less globose form and 

 much larger umbilicus. 



The type of this species (13. M. no. C. 747) is in the 

 " Wm. Smith Collection ; " hence the specific name. There 

 is a fine example from Sherborne, Dorsetshire, in the Wood- 

 wardian Museum, Cambridge, in which the test is beauti- 

 fully preserved. Two smaller ones in the same Museum are 

 from Halfway House, Dorsetshire, and one shows the sculp- 

 ture of the young shell perfectly. 



Horizon. Inferior Oolite. 



Localities. Burton-Bradstock, Halfway House, Bradford- 

 Abbas, Dorsetshire. Two specimens in the British Museum 

 (nos. C. 747 and C. 3095) are without localities, but are 

 undoubtedly British. 



16. Nautilus burtonensis, sp. nov. 

 Ffc. 17. 



Nautilus burtonensis. — a, lateral view, showing the large umbilicus ex- 

 posing the inner whorls ; />, peripheral view, showing some of the 

 sutures where the test is removed. Prawn from a specimen in the 

 British Museum (no. ('. 2841). Somewhal less than halt* the natural 

 size. 



* J. de C. Sowerby, Min. Couch, vol. vi. p. 55, pi. dxxix. fig. 1. 

 ■j- M6m. Soc. Geol. France, ser. ii. vol. v pt. ii. 1855 ; j>. 243, pi, \ii. 

 figs. 5, 5 a, 5 b. 



