HYDEOCOR/VLS OF THE NORTH PACIFIC FISHER 521 



Remarks. — In the type of boreopacifica, dactyloporos of 50 cyclo- 

 sys terns ranged as follows: 5 had 6 dactylopores ; 17 had 7; 15 had 8; 

 8 had 9; 4 had 10; 1 had 11. Seven and 8 therefore occur most fre- 

 quently, whereas in the Okhotsk Sea specimens 5 and 6 are more 

 frequent than 7 and 8, and 3 and 4 occur on the smaller branchlets. 

 As the higher counts are found on the proximal parts of the fragments, 

 it is likely that a complete colony would show a higher percentage of 

 7 and 8. 



Tills species has the smallest cyclosystems of any of the north 

 Pacific AUoporas. 



ALLOPORA VERRILLI Dall 



Plate 54, Figxthe 3; Plate 57; Plate 76, Figures 5, 6 



Allopora verrilli Dall, Proc. Biol. Soc. Washington, vol. 2, p. HI, 1884. — Fisher, 



Ann. Mag. Nat. Hist., ser. 10, vol. 8, p. 391, 1931. 

 Allopora moseleyi Dall, Proc. Biol. Soc. Washington, vol. 2, p. 113, 1884. 

 Stylasler {Allopora) norvegicus forma pacifica Broch (Strait of Georgia record), 



Untersuchungen an Stylasteriden, p. 52, 1936. 



Diagnosis. — Colony small, forming lumpy incrustations, broad- 

 lobed subfiabellate upright masses, or little trees uitli robust to slender 

 branches (pi. 57, figs. 1-3). Cyclosystems medium-sized, with 4 to 

 11 fairly long, deep, subequal dactylotomes, constricted adjacent to 

 gastropore, the sides of which slope inward toward the robust, pointed 

 style, which fills the bottom; gastropore not deep; dactylostyles well 

 developed. Male and female ampullae forming only slight con- 

 vexities of surface of coenosteum. 



Description. — The cyclosystems (1 to 1.25 mm in diameter) usually 

 have 6 or 7 (5 to 11) dactylotomes characteiistically broader at the 

 outer end. The finely spiculate dactylostyle is conspicuous, differing 

 therein from A. stejnegeri and agreeing with A. calif ornica. In some 

 cyclosystems the dactylotomes may be larger on one side (as in 

 californica) but this is not characteristic of the species. The gastro- 

 pore is also much like that of calijornica in that it is narrowly funnel- 

 shaped and is completely filled at bottom by the pointed style (pi. 54, 

 fig. 3). The surface of gastropore is very rough, with tiny blunt 

 protuberances. 



The female ampullae are sunken in the coenosteum, the roof forming 

 only a slight superficial convexity. The chamber is subspherical, 

 about 0.75 mm in diameter. Its inner surface is rough but not 

 intricately fenestrated or spiculate like the interior of gastropore. 



Some of but not all the male ampullae form slight superficial con- 

 vexities. The chamber is subspherical, 0.25 to 0.5 mm in diameter. 



When thoroughly cleaned with sodium hypochlorite the surface of 

 coenosteum presents a somewhat "sugary" appearance, m.ore com.pact 

 at base of colony than at ends of branches. The surface is fairly 

 smooth, marked by fine vermiculations and perforated by microscopic 



