REPORT ON THE CIRRIPEEIA. 
35 
one of my series of sections measured 0'6 mm. In another series, however, it was more 
oval and measured 0'9 by 0'5 mm. The gland is not situated near the cardia but at 
a considerable distance, about half-way between the cardia and the dorsal surface of 
the body. The gland is a true tubular one ; its wall consists of a single layer of cells 
only. The shape of these cells may be seen in PL VI. figs. 4 and 5. Each cell is 
cylindrical or rather conical, its base always being greater than the other extremity, 
which is directed towards the interior of the gland. The bases of the different cells 
are parallel to the nearly smooth outer surface of the .gland ; the other extremities of 
the cells, however, are as a rule not flat but convex, or even protuberant towards 
the interior of the canal which runs through the gland. In thin sections the outer 
surface of the gland is marked by a double line ; the outer one is here and there 
distinctly sinuous, and between the two lines small nuclei are visible, which are rather 
flat ; they are placed in the cavities between the inner and the outer margin. 
There can be no doubt that in this way a rudimentary membrana propria is formed. 
The connective tissue surrounding the glands has smaller meshes and is very rich in 
nuclei. 
The dimensions of the glandular cells are about OT mm. in length and 0 - 03 mm. 
in breadth. Each cell has granular plasmatic contents and a very large oval nucleus. In 
preparations stained with aluminium carminate the body of the cell as well as the 
nucleus has taken up the colour. The first is beautifully lilac-coloured, the latter darkly 
violet. Each nucleus is coarsely granulated and measures 0'036 by 0'02 mm. It contains 
a smooth and brilliant nucleolus of 0 , 009 mm. in diameter. In each nucleus the nucleolus is 
situated in the centre of a clear space, which, as a rule, is placed towards that side of the 
nucleus which is directed towards the internal surface of the gland. The clear space — 
which gives the impression of a clear vesicle with fluid, but which has no distinct contour 
of its own — is on one side separated from the surface of the nucleus only by a very 
narrow layer of the granular substance which fills the nucleus. The nucleus has a 
distinct external contour. 
All the cells are built after the same type ; but there are very characteristic differences 
between the cells of two different specimens of Scalpellum parallelogramma. In the 
first place there is a very marked difference in size ; the length is nearly the same (0‘09 
mm.) ; the breadth, however, measures only 0’013 mm. and the nuclei are not, as in the 
first specimen which I investigated, placed close to the internal surface of the glandular 
cells, but beyond the middle: they are nearer to the external than to the internal 
surface. The structure of the nuclei is the same ; they are more elongate and slightly 
pointed towards the outer extremity. 
In a series of sections through the cephalic part of the body of Scalpellum nympho- 
cola, these glands which I propose to call “pancreatic glands” are also represented. In 
this species the form of the gland is the same as in Scalpellum parallelogramma , the 
