10 G. HERBERT FOWLER. 



other two at the summits of the ectocoelic and entocoelic septa 

 respectively. 



iv. Memoirs referring to the Genus : 



Milne-Edwards and Haime, c Hist. Nat. des Corall./ iii, 

 116. 



Studer, Steinkorallen auf der Reise S. M. " Gazelle" 

 gesammelt, Monatsb. Akad. Berlin, 1877, p. 631, pi. i, fig. 8. 



Moseley, " Challenger" Rep. ZooL, ii, 178, pis. viii, ix. 



Seriatopora subulata (figs. 9 — 13). 



For the material for the study of this coral and of Pocillo- 

 pora I again owe my thanks to Professor H. N. Moseley, who 

 has already investigated the general anatomy of both forms (10). 

 As, however, no structural details have yet been figured, and 

 these somewhat aberrant forms are of great interest, no apology 

 is necessary for a second account of them. The specimens of 

 Seriatopora were obtained by Mr. Gulliver from Zanzibar. 



i. Corallum. — The characteristic feature of the skeleton 

 which caused both Seriatopora and Pocillopora to be ranked in 

 the now abandoned group of Tabulata is the presence of 

 tabulae, i. e. successive floors of coral, by which the living polyp 

 shuts off its coelenteron from the cavity it previously occupied, 

 a condition the opposite to that described above in Lopho- 

 helia prolifera. The calyces are therefore nearly confined to 

 the outermost part of the colony, and are not continued 

 deeply into it, as was the case in Turbinaria. These shallow 

 calyces project but slightly above the coenenchyme, and at a 

 very short distance below the orifice are divided into two 

 halves by the fusion of the two larger septa. These two septa, 

 the axial and the abaxial, are the only two that are developed 

 to any extent, though traces of the other ten may be recog- 

 nised in many cases (cf. the condition of Madrepora Dur- 

 villei (3). When all are present there are six entocoelic and 

 six ectocoelic. It is perhaps more accurate to speak of the 

 calyx as divided into two halves by the fusion of these septa 

 than to regard the two chambers thus formed as special pits 

 for the reception of the two longer mesenteries (10), since 



