NAUTILUS. 



Plate V. 



Species 4. (Mus. Cuming.) 



Nautilus stenomphalus. Naut. testa suburbiculari, 

 lavi, peranguste umiilicata, albidd, postiee transver- 

 sim fiavescente-ferrugineo strigatd, strigis latimculis, 

 distantibus. 



The narrowly umbilicated Nautilus. Shell nearly 

 orbicular, smooth, very narrowly umbilicated, whitish, 

 posteriorly transversely streaked with yellowish rust, 

 streaks rather broad, distant. 



SoWERBY, Thesaurus Conch, vol. i. p. 4(59. pi. 97. f. 3. 



Hub. Eastern Archipelago. 



I adopt this species of Mr. Sowerby, as it is very gene- 

 rally acknowledged, but feel rather inclined to doubt 

 whether it is anything more than a N. Pompilius, in which 

 the deposit of callous pearly matter has been insufficient 

 to cover the place of the umbilicus. In all other respects 

 the species are identical. The umbilicus is of the sim- 

 plest kind, without any characteristic excavation, and it' 

 the pearly deposit, which is formed on either side of the 

 involute spire, were a little more spread, it would be con- 

 cealed from view. 



June, 1861. 



