HYDROCORALS OF THE NORTH PACIFIC — FISHER 509 



deeper, measured to the rim of the gastrostome as shown in the draw- 

 ing (pi. 41, fig. 16). Dr. Broch's drawing of the type of boreopacifica 

 (1936, p. 57, fig. 176) indicates a much shallower gastropore with a 

 narrower mouth. His drawings of Ids Alaskan specimens (fig. 17c, d) 

 indicate that the cyclosystem is broader than in the Asiatic type (fig. 

 17a). A good character of paragea is the slight expansion of the bot- 

 tom of the gastropore to form a style chamber (pi. 41, fig. Ic). There 

 are usually small spicules on the ridge marking the transition between 

 this chamber and the pore above. In specimens cleaned with sodium 

 hypochlorite (as for example the specimen from Alaska, Hans Jensen, 

 listed by Dr. Broch and very Idndly loaned for examination) these tiny 

 spicules can be seen jutting from the wall, deep within the gastropore. 

 No specialized style chamber is shown in Dr. Broch's drawings nor 

 exists in the Okhotsk Sea form of boreopacifica. (See also Broch, 1932, 

 fig. 2(/.) 



ALLOPORA CAMPYLECA TYLOTA, new subspecies 



Plate 41, Figures 2-2e 



Diagnosis. — Differing from A. campyleca in the following par- 

 ticulars: More delicate structure of colony, presence of irregular 

 spiculate outgrowths from the wall of gastrostyle chamber, difi'eren- 

 tiating the chamber from the portion above; a slender gastrostyle 

 in female as well as in male colonies; generally radially shorter dac- 

 tylotomes, with correspondingly wider gastrostome; more prominent 

 female ampullae. 



Description. — The material consists of four fragments of the main 

 branches and eight of branchlets from one or more male colonies, 

 and a fragment of a robust branch of a female colony. The complete 

 colony may well have been as large as the type of campyleca, but was 

 more open, with fewer anastomoses. The peripheral branches are 

 more delicate, the lateral cyclosystems projecting two or three times 

 their own diameter. There is a definite front and back, the latter 

 without cyclosystemiS but mth ampullae, except on largest branches. 

 Length of largest fragment 95 mm; diameter of stem 14 mm. 



The cyclosystems are scattered not thickly on front of the colony 

 and form fairly regular series on the sides of the branchlets, frequently 

 projecting conspicuously. The gastropore is deep, usually slightly 

 curved, and the style is a little stouter than in the male of campyleca, 

 there being no marked differences in the gastrostyles of male and 

 female colonies. About midheight of the style irregular spicules 

 project from the gastropore wall (pi. 41, fig. 2a). In some gastropores 

 these spicules occur also below this point, on the walls of the thus 

 differentiated style chamber (pi. 41, fig. 2e). Length of the finely 

 spiculate style about 0.5 mm. There are usually about 12 to 17 

 dactylotomes, rather shorter than in typical campyleca, but as deeply 



