Ill 
ON SOME POINTS IN THE ANATOMY OF NAUTILUS 
POMPILIUS 
Journal of the Linnean Society, vol. tit. 1859 (Zool.), pp. 36-44. (Read 
June 3rd, 1858.) 
SOME time ago my friend Dr. Sinclair, of New Zealand, had the 
kindness to offer me two specimens of the Pearly Nautilus which 
had been brought to him from New Caledonia, preserved in Goadby’s 
solution. I gladly accepted the present, and looked forward to the 
dissection of the rare animal with no little pleasure; but on pro- 
ceeding to examine one of the specimens, I found its anatomical 
value greatly diminished by the manner in which a deposit from the 
solution had glued together some of the internal viscera. Other parts 
of the Nautilus, however, were in a very good state of preservation ; 
and I have noted down such novel and interesting peculiarities as. 
they presented, in the hope that an account of them will be acceptable 
to the Linnean Society. 
Of the six apertures which, besides the genital and anal outlets, 
open into the branchial cavity of Mawttlus poimptlius, one on each 
side lies immediately above and in front of that fold of the inner 
wall of the mantle which forms the lower root of the smaller and 
inner gill, and encloses the branchial vein of that gill) The aperture 
is elongated and narrow, with rather prominent lips. It measures 
about 4th of an inch. 
The other two apertures are larger, and lie at a distance of ;¢ths 
of an inch below and behind the other. They are in close juxta- 
position, being separated only by a thin triangular fold of membrane, 
which constitutes the inner lip of the one and the outer lip of the 
other. 
The inner aperture is the larger, measuring ;’;ths of an inch in 
long diameter, and having the form of a triangle with its base directed 
posteriorly. The outer aperture is not more than {th of an inch long. 
VOL. II G 
