138 SYNOPTIC COLLECTION. 



Manicina is interesting for the reason that it is a rapid 

 swimmer when young, fixed by a pedicel when mature, 

 and free again when old. In developing, the stage 

 with eight mesenteries is followed in a day or two by the 

 stage with twelve. 1 The skeletons (No. 229) show 

 different stages of growth, the colony never becoming 

 much larger than the largest specimen. 



Euphyllia gracilis Dana (No. 230), forms small colo- 

 nies. The thecae in this genus are circular, compressed, 

 and sometimes meandering. 



The same method of reproduction is illustrated by the 

 massive brain coral, Diploria cerebriformis M.-Ed. & H. 

 (No. 231), which grows to a great size and which repre- 

 sents the skeletons of a vast number of coral animals. 



Favia (No. 232) is a hemispherical colonial form in 

 which the corallites are united and the septa are toothed. 

 The columella is spongy and an epitheca sometimes ex- 

 ists. 



Orbicella annularis Dana (No. 233), is also hemispheri- 

 cal in shape and the new buds arise in the spaces between 

 the corallites. 



The corallites in Galaxea fascicularis Oken (No. 234), 

 project from the surrounding coenenchyma. Each is 

 marked by striae which indicate the septa. The latter 

 are distinct and the longer ones reach to the columella 

 which does not project upward. This genus increases by 

 budding from the walls of the corallites and also from the 

 basal coenosarc that extends between the corallites. The 

 coral takes on a foliaceous shape in Agaricia agaricitcs 

 E. & H. (No. 235). The columella is present but the 

 septa are not numerous. Pachyseris luevicollis E. & H. 

 (No. 236), is a related form. 



IH. V. Wilson, Journ. of Morph., II, No. 2, 1888, p. 191. 



