REPOET ON THE CIRHIPEDIA, 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 caxdia 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 diS'erent cells 

 are parallel to the nearly smooth outer surface of the glaiid ; 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 O'l 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 '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 fiOs the nucleus. The uuc-leus has a 

 distinct external contour. 



AU the cells are built after the same type ; but there are very characteristic differences 

 between the cells of two different specimens of ScaljM'Hum '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 tlie 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 ceplialic part of the body of Scalpellnm nymplio- 

 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 ScaljJellum parallelogramma, the 



