HYDROCORALS OF THE NORTH PACIFIC FISHER 527 



SO that the subacute end of the gastrostyle (which is somewhat 

 slenderer than in the type form) is less exposed than in northern 

 specimens. 



In venusta the surface of the cleaned coenosteum is smooth, not 

 minutely pitted or fenestrated, yet, owing to the underlying structure, 

 under strong magnification it reminds one of pink sugar. The little 

 papillae are sparse and of uncertain occurrence, and the intercalycine 

 dactylopores are scarce, tiny, and without a raised border (which is 

 not always present in calif ornica). 



Color: There are two color phases, the prevalent pink one (a dull 

 begonia rose to alizarine pink) and a faded violet form (tourmaline 

 to laelia pink) occurring off Cape Flattery. 



Type. — In Museum of Comparative Zoology, Cambridge, Mass. 



Type locality. — Neah Bay, near Cape Flattery, Wash. 



Specimens examined. — The type. Also from Station 2873, 1 colony; 

 station 2874, 24 small colonies and fragments; station 2875, 15 small 

 colonies and fragments ; station 2888, 3 colonies; station 3050, 1 colony; 

 station 3158, 1 colony; Monterey Bay, Calif., 30 fathoms, 1 colony. 



ALLOPORA PAPILLOSA Dall 



Plate 54, Figures 4, 4a; Plate 59, Figure 3 



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

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



Diagnosis. — Colony small, thin, incrusting; cyclosystems asym- 

 metrical, small, with funnel-shaped gastropore and 4 or 5 short, deep, 

 unequal dactylotomes, asymmetrically distributed; a differentiated 

 style chamber partly occluding the finely spiculate, pointed, large, 

 subcorneal gastrostyle; dactylostyles well developed; coenosteum 

 papillose, fenestrated, sugary in texture. 



Description. — Owing to meagerness of material every statement 

 concerning this species must be regarded as provisional. The entire 

 type fragment shown in the photograph measures only 10 mm, longest 

 dimension, and is a thin incrustation removed from a fragment of 

 Mytilus shell. 



The cyclosystems resemble those of calijornica, but the style is 

 enclosed in a style chamber, the top of which, formed by outgrowths 

 from side of gastropore, partly hides the large style, the entire width 

 of which is not apparent when the gastropore is examined from above. 

 In this feature the cyclosystem resembles that of venusta, but the 

 gastropore is funnel-shaped, and the dactylotomes are longer, unequal, 

 and asymmetrically arranged. The deep dactylotomes descend on 

 side of gastropore more than halfway to tip of gastrostyle. Dacty- 

 lostyles conspicuous. The largest cyclosystem (pi. 54, fig. 4) is 

 0.85 by 0.9 mm in diameter. 



