HYDRO CORALS OF THE NORTH PAOITICJ — FISHER 507 



ALLOPORA CAMPYLECA PARAGEA, new subspecies 



Plate 41, Figubes l-ld; Plate 43 



Stylaster (Allopora) boreopacificus forma typica Broch (iu part), Untersuchungen 

 an Stylasteriden, p. 56, fig. 17, c, d, pi. 8, pi. 9, pi. 10, figs. 24, 25, 1936. 



Diagnosis. — Differing from boreopacifica of Japanese Sea in having 

 much deeper gastropores, at the bottom of which is a differentiated 

 style chamber, the dorsal orifice of which (at about midheight of the 

 style) is generally bordered by spicules. Differing from campyleca 

 in having smaller cyclosystems with 5 to 11, usually 7 or 8, dactylo- 

 tomes; the narrow often curved gastropore typically flares slightly, 

 trumpetwise, at the mouth. 



Description. — The principal colony forms are as follows: a, Com- 

 pressed arborescent, such as the male type specimen and a small 

 female fragment from station 4245; b, flabelhform, with thick main 

 trunks and slender twigs, as the colonies figured by Broch, and the 

 very imperfect large specimen labeled "Alaska"; c, flabelhform, with 

 broad main stems and short, thick, flattened branches, represented by 

 a small female colony from vSitka. The photograph gives a fair idea 

 of the habit of the type specimen. Although the whole colony is 

 flattened and hence subflabeflate, it is a flattened bush, since the 

 branchlets form several layers, one behind the other, without any 

 coalescence. There is a well-marked front and back, the cyclosystems 

 being scarce on the back of the main stems and large branches. 

 Height of colony 130 mm, greatest width about 125 mm, but it was 

 much larger before the branches were broken; maximum front to back 

 extent toward periphery about 60 mm; diameter of main trunk at 

 base about 25 mm, of peripheral branchlets about 1.5 to 2 mm. 



Cyclosystems average a trifle broader than in typical boreopacijica 

 and measure 0.6 to 0.85 mm in diameter. They are hence narrower 

 than in campyleca. They project sUghtly above the surface; are 

 widely scattered on front of larger branches; are more numerous on 

 the branchlets, especially on the lateral faces, but are nowhere crowded. 

 Gastropore often rather flaring at mouth, below which it narrows, and 

 is normally deep and slightly curved, narrowing toward the bottom, 

 where the style chamber is slightly better differentiated than in 

 campyleca. Gastrostyle medium slender, lanceolate in profile, sharp, 

 about 0.5 mm long. As may be seen from the figures, the 5 to 9 or 10 

 dact5dotomes are rather short, owing to the usually flaring gastrostome, 

 on the sides of which the shts cut about as deeply as their length seen 

 from above. The dactylopore is small, deep. In many systems the 

 dactylostyle is rudimentary; in others it is fairly well developed, but 

 does not extend above mouth of pore proper. 



When the cyclosystem of the branchlets is viewed directly from 

 above, the gastrostyle is hidden by the curvature of the gastropore, 

 but on the larger branches the style can usually be seen. 



