465 



rugineo strigata, strigis ad umbilicum continuis ; raargine interno 

 umbilico albicante, externo ferruginea. 



In form this species most nearly resembles iV. amh'igivm, though 

 in its colouring it is like N. Pomjnlius. Its large umbilicus, with 

 a rounded margin, at once distinguishes it from both. 



5. Nautilus stenomphalus (pi. xcvii. f. 3), nobis. 



Testa suborbicularis, subventricosa, utrinque umbilicata, um- 

 bilico angusto, margine umbilici subiuteruo leviter augulato ; 

 pallescens, postice radiatim ferrugineo strigata, strigis ad dorsum 

 contiguis, ad centrum discontinuis ; apertura rotundato-cordata. 



Nearly simUar in shape to N. macwmphalus, but distinguished 

 by the smaUuess of its umbilicus, the subinternal margin of which 

 is slightly angular : in colouring it is like N. amhujims. 



NAUTILUS. 



EXPLANATION OF PLATES XCVII. AND XCVIIL 



