FLATWORMS AND MESOZOA, ETC. 



g: 



Crista (Fig. 2), Cellaria, and others, 

 in which the branches are inter- 

 rupted at intervals by chitinous 

 joints. The coral-hke forms may 

 assume the most exquisite shapes, 

 pre-eminent among which are the 

 lovely net-like colonies of Retepora. 

 Polyzoa of this type are seldom 

 found between tide-marks, where 

 their brittle branches would be 

 liable to be snapped off by the 

 waves. The erect species, which 

 occur in such positions, are flexible, 

 although flexible species are by no 

 means restricted to the zone between 

 tide-marks. 



So far as we have up to the pre- 

 sent been able to read this book, it 

 has afforded us much pleasure, and 

 we trust that the extracts w^hich, 

 with the publishers' permission, we 

 have been enabled to make, will 

 convey to our readers some idea of 

 the exceedingly interesting nature of 

 the work. 



Our best thanks are due to Messrs. 

 Macmillan for the use of the very 

 beautiful electro blocks so kindly 

 lent to us. 



Fig. 2. — CVism ramosay Harmer, Ply- 

 mouth. — A, End of branch (nat. size). 

 B, Another branch, x 20, showing the 

 chitinous joints, the tubular zooecia 

 characteristic of Cyclodomata, and the 

 pear - shaped ovicell with a funnel- 

 shaped orifice at the upper end. 



International Journal of Microscopy and Natural Science. 

 Third Series. Vol. VII. 



