NOTICES OF NEW BOOKS. 309 
“chamber,” in which the polypide is lodged. In a colony a 
large number of zoccia are without polypides, as the life of the 
polypide is often short, whereas the colony may have a very long 
lite. When a polypide disappears, it is replaced by a “brown 
body,” and this has given rise to much discussion and a large 
amount of published speculation. 
It is now, however, universally recognised that it is derived 
from the polypide, and is the result of its decline; but Mr. 
Hincks has some hesitation in following Joliet in his opinion that 
this brown body is without reproductive function, and, although 
the evidence against this is very strong, lays much stress on the 
fact that the second crop of polypides, where developed from the 
brown body, have at first a reddish brown colour, which is wanting 
in the polypides of young marginal cells. 
Much discussion has also arisen concerning another tissue, 
now called the endosare, shown to be derived from the endocyst, 
and which is seen under various forms, sometimes most clearly 
as the “funiculus,” attached to the base of the stomach of the 
polypide and passing down to the bottom of the cell. 
In some, as Zoobotryon pellucidus, the endosare passes as 
a connective cord along the stolon, and gives off a branch to each 
polypide ; in others it is seen near the back or dorsal surface of 
the zocecium, extending down its walls, and in contact with each 
of the “‘communication-plates,” showing in several respects great 
variation according to the mode of growth of the species. Miiller, 
Smitt, Clararéde, Hincks—all adopted the view that this was a 
colonial nervous system; but Joliet clearly demonstrated the 
incorrectness of this interpretation, and Mr. Hincks now recognises 
the value of Joliet’s evidence. 
We do not think Mr. Hincks has been fortunate in his choice 
of woodcuts to illustrate this point, for Reichert’s figures must be 
looked upon as incorrect diagramatic elaborations, and fig. xv. 
(which is unconsciously somewhat improved) is probably taken 
from Zoobotryon in an abnormal, perhaps we may say enfeebled, 
condition; nor is it one of Reichert’s most characteristic 
figures. 
Probably it will be found that the above remarks apply to 
most of the figures which have appeared of Zoobotryon, and 
instead of one thick cord a large number of thin threads, placed 
together as a bundle, and frequently anastomosing, should be 
