400 GILMAN A. DREW 
each portion of which has a definite individual function in the 
formation of spermatophores. For convenience we will call 
it the spermatophoric organ. This name will be applied to 
the whole structure, consisting of various glands and mechan- 
isms, which extend from the vas deferens to the duct that car- 
ries the completed spermatophores to the spermatophoric (Need- 
ham’s) sac. The spermatophoric organ is rather transparent, 
like most tissues of the squid. The forming spermatophores 
may be easily seen in the different parts of the organ. It is 
possible to cut the organ away from the visceral mass, place 
it in a watch-glass of sea-water and, under a compound micro- 
scope, see somewhat clearly the structures and positions of a 
forming spermatophore. By keeping the water changed on 
such an organ, its movements, which are very vigorous, will 
be kept up for nearly an hour and the forming spermatophores 
during the interval will move some distance. Within this organ 
the spermatophores are formed and completed. 
The duct leading from the spermatophoric organ to the sper- 
matophoric sac, which will be called the spermatophoric duct 
(frequently called the vas efferens, and by Marchand the distal 
vas deferens) carries the completed spermatophores for storage 
in the spermatophoric sac. 
The vas deferens (figs. 29 and 30, VD) passes dorsal to the sper- 
matophoric organ (between it and the general visceral mass) | 
for about three-quarters of the length of the organ, where 
it joins the first of a series of structures that together form this 
organ (fig. 32, VDO). 
The portion of the spermatophoric organ joined by the vas 
deferens I will call the mucilaginous gland (figs. 29 to 36). It 
secretes a sticky substance which is mixed with the spermatozoa 
and forms the material in which the sperm thread is imbedded, 
the cement body, and the hyaline core around which the spiral 
filament is wound. This gland is composed of two parts. One 
part (MG?) extends from the vas deferens to the next portion 
of the spermatophoric organ. This is referred to by Marchand 
as the second division of the spermatophoric gland (vesicula 
seminalis). Marchand uses the term spermatophoric gland 
