544 DR. S. J. HICKSON ON 



Alcyonarian fauna of the Columbian and Alaskan waters, and 

 subsequent researches may modify any deductions that may be 

 drawn from them, but so far as our knowledge extends at present 

 the facts are significant. 



I wish to acknowledge my indebtedness to Professor A. Willey, 

 F.R.S., and to Mr. McLean Eraser for the specimens described 

 in this paper; to Miss Constance M. Lightbown, B.Sc, for much 

 valuable assistance in making preparations and drawings, and to 

 Mr. J. T. Wadsworth for taking the photographs (PI. I.) and 

 for the drawing of text-figure 3. 



Order STYLASTERINA. 



Stylaster (Allopora) norvegicus Gunnerus. (PI. I. fig. 3.) 



Millepora norvegica Gunnerus, 1768. 

 Allopora californica Yerrill, 1868, Essex Inst. vol. v. 

 Allojwra oculina Moseley, 1881, ' Challenger ' Reports, vol. ii. 

 p. 85. 



Stylaster norvegicus Bi-och, 1914, Danish 'Ingolf ' Expedition. 



Swiftsure Shoal, ofi" Barkley Sound, W. coast Vancouver 

 Island. 



Local name. Roseate stag's horn coral. 



A single dried specimen of this Stylaster was taken by 

 Professor McMurrich from the Swiftsure Shoal. 



It is 45 mm. in height, with seven short blunt branches 

 arranged in a single plane. One of the branches shows a barnacle- 

 gall. As there is no base of attachment, the specimen may be a 

 branch of a much larger colony. 



The main stem is 10 mm. in diameter, and the branches about 

 5 mm. in diameter. 



The cyclosystems are evenly distributed on all sides of the 

 branches, and they are not more numerovis on one side of the 

 flabellum than on the other. Each cyclosystem projects slightly 

 from the surface of the coenosteum and is about 0"75 mm. in 

 diameter. 



The number of dactylopores in each cyclosystem varies, but in 

 the majority of cases there are 6 or 7. There is a large brush- 

 like style in the gasteropore and a veiy small style in each of the 

 dactylopores. No ampullae can be seen on the siu-face of the 

 cffinosteum, but at the broken base a few small cavities (0*5 mm. 

 in diam.) may be seen which are probably young ampvillfe. 



The colour is salmon-pink. 



The difiiculty of sepai^ating the two Stylasterid geneva, Allopora 

 and Stylaster was pointed out ten yeai's ago by myself and 

 Miss England (1905, p. 6). Broch (1914), agreeing with our 

 view on this matter, has included Allojyora in the genus Stylaster, 

 retaining the name Allopora as a subgeneric name for species of 

 Stylaster included in our group of species D. " For group D the 

 old generic name Allopora should be retained." This is clearly 



