BY WILLIAM A. HASWELL. 
547 
tentacles and ridged organ. Its possession is quite as character- 
istic a feature of the female as the presence of the spadix is of 
the male. In the male its only representative is a bi-lobed 
folded body, termed by Van der Hoeven " cushion-shaped incised 
bodies." 
Graham Kerr has apparently suggested such a connection for 
the ridged organ, as will appear from the following quotation 
from the abstract already referred to — " The curious laminated 
organ ventral to the buccal mass in the female, which had been 
believed to be olfactorj^, was pointed out as probably having some 
connection with reproduction — apparently being a glandular* 
apparatus to which the spermatophore of the male becomes 
attached." That the organ has some such function seems to me 
extremely probable. In the Dibranchiate Cephalopods the 
hectocotylised arm is so long that it can readily be used as an 
intromittent organ for depositing the spermatophores in the mantle- 
cavity of the female. In the Nautilus, however, such intro- 
mission is impossible, and there must be some indirect mode of 
transmission of the spermatophores. It seems very probable 
that the whole inner part of the foot of the female is connected 
with this function, grasping the spadix and receiving the sperms 
from the cavities on its honey-combed tentacle. The presence 
in the wall of the mantle-cavity of the female of a pair of glands 
which appear to correspond to the nidamental glands of the 
Dibranchiata, would seem to render it probable that the ova must 
be fertilized in the mantle-cavity. The function of the laminated 
area, present only in the female, on the inner surface of the outer 
tentaculiferous lobe may, perhaps, be to form a brood-pouch for 
the developing ova. Such a function might be suggested for the 
inner lobe, were it not that the latter is in close contact with the 
buccal mass, and thus must be subject to frequent changes of 
position. 
One of the six or eight female specimens examined byme presents 
a condition of the median inner tentaculiferous lobe, which may, 
perhaps, have a bearing on the functions of the part. In this 
specimen, which was a good-sized one and fully developed in 
