138 



PEOCEEDINGS OF THE MALACOLOGICAL SOCIETY. 



not seen; inclusion nearly complete; umbilicus small, deep, with 

 subangular margin. Whorl subquadrate in section, wider than high ; 

 indented to about one-fourth of its height by the preceding whorl ; 

 periphery broad, flattened, feebly convex, with obtusely angular 

 margins; sides flattened, convergent; inner area fairly well deflned, 

 rather _ wide, steep. Body-chamber occupying rather more than 

 one-third of the outer whorl, aperture not seen, but judging from 



Fig. XV. — Nautilus exiguus, n.sp. a, lateral view of an example of the less inflated 

 form ; b, front view of the same ; c, lateral view of an example of the more 

 inflated form ; d, front view of the same. Inferior Oolite : Bradford Abbas, 

 Dorset. Drawn from the type-specimens in the British Museum [C. 4233 and 

 C. 4235]. Natural size. 



the lines of growth, with a deep hyponomic sinus ; depth of chambers 

 not seen ; suture-line with a simple shallow curve on the lateral 

 area and a very shallow curve on the periphery. Siphuncle not 

 seen. Test with fine lines of growth, which are slightly sinuated 

 on the sides, and form a deep broad sinus on the periphery ; the 

 whole of its surface with obscure waved longitudinal lines. 



Dimensions. 



Diameter 



Height of outer whorl 



Height of outer whorl above 



preceding whorl 

 Thickness 

 Width of umbilicus 

 Approximate width of periphery 



(i) 

 28 



mm. 



(ii) 



27 



15-5 



)> 



16 



about 12 



■n 



11 



18-5 



11 



19-5 



3 

 11 



11 

 11 



2 

 11 



