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4.5 nim. from its proximal end. One of the resultant branches gives off a single branchlet, 

 and the other two, besides several nodules with groups of calyces as is characteristic of the 

 genus. These nodules, as well as the single calyces, are all on three sides of the stem and 

 branches, and are more closely crowded that in other species of the genus. The diameter of 

 a terminal branch is 1.3 mm., while its swollen end is 5 mm. 



The individual calyces are well marked, proportionally more prominent than in allied 

 species and very unequally distributed. A typical calyx measures 1.3 mm. in height and 2 mm. 

 in diameter. The margin is closed over the retracted polyp and bears eight rather feebly 

 marked lobes. The calyx walls as well as the general ccenenchyma are covered with a super- 

 ficial layer of small oval spicules. The polyps are completely retractile. There is a narrow but 

 distinct band of red spindles on the dorsal surface of each tentacle, the bands becoming 

 narrower and disappearing distally. 



Zooids do not appear to be present in this species. 



A section across a branch shows a poorly differentiated axis composed of rather slender 

 tuberculate spindles and penetrated by water-vascular canals. There is a rather regular series 

 of these canals surrounding the axis. The ccenenchyma is filled with stouter spindles inter- 

 grading with the oval densely tuberculate forms which constitute the superficial layer. There 

 are also a few small crosses, stars, etc. 



Spicules. These have already been described and consist almost exclusively of tuber- 

 culate spindles and densely tuberculate oval forms, with all degree of intergradation between them. 

 C o 1 o r. The colony is a bright coral red throughout. 



Genus Iciligorgia Duchassaing de Fontbressin. 



Iciligorgia Duchassaing de Fontbressin. Revue des Zoophytes et des Spongiaires des Antilies, 



1870, p. 12. 

 Iciligorgia Ridley. Zoological Collections of H. M. S. Alert, 1884, p. 351. 

 Iciligorgia Studer. Versuch eines Systemes der Alcyonaria, 18S7, p. 29. 

 Iciligorgia Wright and Studer. Challenger Reports, the Alcyonaria, 18S9, p. xxxiv. 

 Iciligorgia Delage et Hérouard. Traite de Zoölogie Concrete, II, 2, 1901, p. 413. 



The orio-inal definition for this o-enus is as follows : 



"Axis mollis, spongiosus, spiculis farctus : cortex tenuis, spiculis aciniformibus formatus ; 

 calycibus mammeeformibus, obtusis, in utroque latere ramorum uniseriatis". 



Ridley (18S4) defines the genus as follows: 



"Central spicular axis dense, imperforate. Longitudinal canals forming a circumaxial zone. 

 Erect, branched : stem and branches antero-laterally compressed, with knife-like lateral edges. 

 Zooids wholly retractile, arranged in single series along each edge of the branches ; no 

 external verrucae". 



Studer (1887) defines the genus as seen in the following translation: 



"Here the colony is in the form of an upright branched stem. Stem and branches 

 compressed. Polyps borne in irregular rows on the thin borders of the branches, entirely retractile". 



SIBOGA-EXPEDITIE XIII /' 5 . ? 



