490 Mr. A. W. "\^ aters on a Structure in 



one of these same bodies was found in the slides prepared. 

 None have been found in sections of Adeonella plaiaha, 

 Busk ; in Adeonellopsis distoma *, Busk ; in a new Adeonel- 

 lojisis from Zanzibar shortly to be described ; nor in Adeona 

 foliacea, var. fascialis, Kirchenpauer. This is the limit of 

 material as yet available, some of which was in poor condition, 

 and it is much to be \\i.«hed tliat sections should be cut of 

 several Adeonce and AdeoneUopsis besides more Adeortellcp. 

 For a time it seemed as if this was a character peculiar to 

 Adeonida3 or perhaps only Adeonella, but I came upon a 

 forgotten note concerning a similar structure in Betepora 

 celhdosa, L., from Naples, and now find it in Refepora 

 mediterranean Smitt, and B. elongata, Rraitt, from Franz 

 Josef Land. Although found in one specimen of B. cellulosa 

 from Naples, other specimens from there and from other 

 localities are without it in the sections cut. Similarly the 

 first specimens cut of A. contorta, M., showed nothing of the 

 kind. 



These masses frequently nearly fill up a zocecium (PL X. 

 figs 1, 6, 9) in which the ordinary testes or ovaria are in 

 many cases well developed, and usually a polypide or bud 

 also occurs at the side or over the body, and the zooecia 

 containing them are frequently close to the zooecia or rather 

 gonoecia with an embryo. The separate bodies are embedded 

 in what may for convenience be called a matrix, and about 

 twenty seems to be an average number ; they are elongate or 

 oval, and round in section (PI. X. figs. 3, 4, 7, 8). Some- 

 times a few are more or less separated, and one such body is 

 ciliated all round in a transverse section (PL XL fig. 9). 

 The contents are not always the same, but represent various 

 stages: one stage has large dark cells (in carmine-lijemato- 

 xylin) (PL X. figs. 2, 3, 4) of rather varying forms, in 

 one direction often more or less triangular with a large dark 

 nucleus (PL X. fig. 2, c) ; another stago shows these cells 

 with a large nucleolus and a nucleus in the cell (PL X. 

 fig. 6) or with nucleus and nucleolus with the cell more 

 irregular, often amoeboid in shape, and the body now lined 

 with square cells. Some of these bodies, which remind us of 

 planula, have the cells much more numerous, closer together, 

 and with much smaller nucleus (PL XL fig. 3, h 1). There 

 are other bodies, usually one in each mass (PL X. figs. 1 

 and 2, t.g.), filled with a structure composed of small nuclei or 



• Tliis has sometimes beou described as A. coscinopora, Rss.. but 

 as Keuss in bis papers described two or three species ns costeinopora 

 the name had better be dropped, since there must always be uncertainty 

 about it. 



