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EXPLANATION OF PLATES XLVIII-LXIV. 



The figures showing entire zooids were in all cases drawn with the aid of a 

 camera lucida, as far as the outlines of the body and the principal organs are 

 concerned ; the smaller details were necessarily filled in without it. The mag- 

 nification of the figures of zooids is uniform ; 32 diameters, except in the case 

 of a few forms with zooids too large to admit of this. It is hoped that these 

 figures will give a better conception of the relative sizes of the zooids than 

 simple measurements, as the latter fail to give any idea of the state of contrac- 

 tion the animal is in. It has not been possible to get fully expanded specimens 

 in the case of most species, but the degree of contraction, of the thorax at least, 

 may be judged by the course of the endostyle, which is crooked or convoluted 

 in the contracted state, but straight or nearly so when the animal is fully 

 expanded. In all cases they have been represented as if transparent to show 

 the internal structure. 



