Messrs. Hancock and Embleton on the Anatomy of Eolis. 93 
fore mentioned, tlie oviduct, the duct from the spermatheca, and 
the posterior termination of the testis. The whole surface of the 
gland presents to a certain extent the appearance of the cerebral 
convolutions of the higher animals ; there is however a rounded 
portion seen next the fissure on the upper aspect of the lobes 
when they are held asunder, that differs from the rest in being 
opake, granular-looking and of a flesh colour, but more mi- 
nutely convoluted than the semipellucid portion, yet forming 
an integral part of it. The semipellucid part of the gland 
can easily be seen to be disposed in the form of hollow laminae 
folded upon each other, and these on the upper surface have a 
zigzag arrangement. The cavities of the laminae communicate 
freely with a wide channel in the interior of each lobe, and these 
channels unite to form a common tube b, which ends externally 
at the female orifice, fig. 2 V, after having received the termina- 
tion of the oviduct 7i. This gland we believe not to be the testis, 
as Cu\der and his followers supposed it — for it has no direet con- 
nexion with the male parts — but to be the organ which secretes 
the transparent glairy matter that envelopes the ova previous to 
their passing from the body, by which they become attached to 
the substances on which they are deposited, and which protects 
them from injury during their evolution. On examining the se- 
cretion of this gland by the microscope we found no spermatozoa, 
but instead, a tenacious granular -looking fluid, with broad nucle- 
ated granular scales of what seemed to be pavement epithelium. 
The ovary and other female parts do not appear to differ ma- 
terially from the above description in E. coronata, E. Drummondi 
and E. olivacea. 
3rd. Androgynous apparatus : the spermatheca, figs. 1 & 2 /^, 
lies in front of the ovary between the two lobes of the mueus- 
gland, and is almost concealed from view by them and by the 
dilated convoluted part of the oviduct. It is a globular or pyri- 
form sac, of a dirty olive colour, having one or more accessory 
sacs, y, attached to its duct ; its walls are thin, but strong and 
muscular. In E. papillosa and E. coronata it has been found 
crammed full of a mass of fully- developed spermatozoa and cor- 
puscles. The spermatozoa, fig. 10 « & 6, consist of a narrow 
elliptical transparent head often bent upon a long slender tail or 
filament, which is seen to be either straight or waved, or spirally 
rolled upon itself. The corpuscles, c, are small, elliptical, and 
varying in size, many of them having a transverse band, others 
a cross upon them, apparently indicating a tendency to split into 
two or four parts as represented in the figure. 
The duct ef the spermatheca, ^, comes off from the under and 
anterior part, and after a very short course forwards empties 
itself into the oviduct at /, fig. 2, appearing to end there, but in 
