516 PROCEEDINGS OF THE NATIONAL MUSEUM VOL.84. 



ALLOPORA SOUDA (Broch) 



Plate 76, Figures 1, 2 



Stylaster solidus Broch, Einige Stylasteriden (Hydrokorallen) der ochotskischen 



und japanischen See, p. 60, 1935. 

 Stylaster (Allopora) solidus Broch, Untersuchungen an St5'lasteriden, p. 68, 



fig. 22, pi. 9, fig. 30, 1936. 



Diagnosis. — Branches coarse, subterete, with shghtly raised, well- 

 spaced cyclosystems on all sides; no differentiated front and back; 

 cyclosystems with 4 to 9, mostly 5 to 7, narrow dactylotomes, very 

 shallow at gastropore end ; gastropore very narrow, cylindrical, some- 

 times slightly curved, but usually oriented perpendicular to surface; 

 Gastrostyle large, but only medium stout, and tapered regularly from 

 base to a sharp point, its length half to two-thirds depth of gastro- 

 pore; no differentiated style chamber; ampullae only slightly convex, 

 not rugose. 



Description. — The cyclosystems are very characteristic in having 

 narrow dactylotomes, \vitli parallel sides, as long as width of gastro- 

 stome and shallowly cut at inner end. The angular septa between the 

 dactylotomes may slightly overhang the gastropore as in stejnegeri 

 and brochi. The dactyloj^ore proper is large and provided with a 

 conspicuous style. When the cyclosystem is viewed directly from 

 above, the wall separating dactylopores from gastropore appears as a 

 definite ring (the top of which causes the shallow inner end of dac- 

 tylotome). The surface of gastropore is pitted and roughened by 

 irregular longitudinal ridges, but these are not decurrent from the 

 septa as in brochi. The gastrostyle is long-conical, rather slender, not 

 at all constricted at base, and ends in a sharp point. Diameter of 

 cyclosystem 0.9 to 1.15 mm. Depth of a sample gastropore 0.95 mm; 

 length of gastrostyle 0.6 mm, breadth at bottom 0.28 mm. The 

 gastrozooids are without tentacles (Broch). 



The female ampullae cause only a slight swelling of the surface, as 

 in A. verrilli. This "roof" is 0.25 mm thick, the cavity 0.85 mm wide 

 by 0.5 mm high; its surface is rough with many delicate spicules. 



The coenosteum is hard with the characteristic fi.nely vermiculate 

 etching of the surface. 



Color: Bright salmon pink to rose. 



Type locality.— Okhotsk Sea, lat. 56° 24' N., long. 143° 18.5' E., 

 100 meters; temperature in 95 meters, 1.34° C. 



Specimen examined. — A fragment of the type material, marked 

 cotype, loaned by Dr. Broch. 



Remarks. — Apropos of the absence of gastrozooid tentacles in this 

 species, certain gastrozooids of A. porphyra lack tentacles apparently 

 as a normal though infrequent variation. 



