300 T. A. STEPHENSON 



they are there foreign bodies may adhere to them ; margin distinct, may 

 be crenulated. Disc circular or more or less lobed. Tentacles shorter 

 or longer, may attain good length : at any rate not mere papillae. Not 

 more than one tentacle per exocoel. As to the endocoels (see Part II, 

 Text-fig. 14, f), there are never radial rows on all of them ; usually 

 there are radial rows on the older ones or some of them, but these 

 vary in length — the larger ones may contain a good many tentacles or 

 only a few ; the rows are more or less single, and sometimes they arc 

 quite absent so that the form is not ' Stichodactyline ' as to tentacles 

 at all, having only one per endocoel. Cleft tentacles may occur here and 

 there among the others. Sphincter weak or moderate, diffuse, circum- 

 scribed diffuse, or circumscribed. Number of siphonoglyphes and 

 directives variable. 

 Species : 



A. koseirensis, Klunz., 1877. p. 77. (See Simon, 1892, and 

 Carlgren, 1900, p. 85.) 



A. ritteri, Kwiet., 1898. p. 417. (See Carlgren. 1900, p. 81.) 



A. kuekenthali, Kwiet., 1897, p. 332. 



A. papillosa, Kwiet., 1898. p. 415. 



A. macrodactylus, H. and S., 1893, p. 120; Haddoa, 1898, 

 p. 471. 



A. main, H. and S., 1893, p. 120; Haddon, 1898, p. 472. 



A. carlgreni. Lager, 1911, p. 243. 



A. concinnata, Lager, 1911, p. 244. 



A. glandulosa. Lager, 1911. p. 246. 



A. kwietniewskii. Lager, 1911, p. 247. 



8iib-order MADREPORAEIA. 



I do not wish to suggest, even vaguely, to which of the 

 skeleton-forming corals the genera defined below are related. 

 The ground for ])lacing them under Madreporaria will be found 

 in Part II, p. 510. To save repetitions, a general statement 

 covering Corallimorphidae and Discosomidae is given first, 

 but it is not meant as the definition of a sub-tribe, although it 

 would serve that purpose if such a sub-tribe were needed. 



Madreporaria which secrete no definite skeleton. They may live quite 

 a solitary life, or may live together in numbers. They frequently repro- 

 duce by fission, and compound iucUviduals with several mouths may be 

 found, or individuals connected by a coenosarc. There is a definite 

 base. The body is smooth, and variable in form and consistency. The 



