HYDROCOEALS OF THE NORTH PACIFIC — FISHER 541 



thin walls of the ampullae are perforated by irregular pores forming a 

 sort of grille work. The surface of the stem is hard, fairly smooth, 

 not at all fenestrated. 



Color of dried colony, ochraceous-buff . 



Type.— U.S. 'NM. no. 42874. 



Type locality. — Station 3480, Amukta Pass, Aleutian Islands, lat. 

 52° 06' N., long. 171° 45' W., 283 fathoms, black sand, rocky. 



Specimens examined. — The type and three fragments from same 

 locality. 



Remarks. — This species can be distinguished by the very large 

 dactylopore projections, which are relatively gigantic when compared 

 with those of £". pourtalesii and E. nanneca. But relative to the size 

 of the groove the dactylostyle of zarhyncha is much smaller than in 

 pourtalesii. It is narrower and does not extend so far toward the 

 end of the spoutlilce process. In zarhyncha the gastrostyle is slenderer 

 and more tapered than in pourtalesii and of a coarser texture; it does 

 not fill so much of the gastropore, or extend so far toward the orifice. 



ERRINOPORA POURTALESn (Dall) 



Plate 65, Figure 2; Plate 66, Figure 2; Plate 70, Figures 1-la 



Errina pourtalesii Dall, Proc. Biol. Soc. Washington, vol. 2, p. 114, 1884. 

 Errinopora pourtalesii Fisher, Ann. Mag. Nat. Hist., ser. 10, vol. 8, p. 397, pi. 16, 

 figs. 4-46; pi. 17, figs. 7, 7a, 1931. 



Diagnosis. — Characterized by its pink color, subterete, dichoto- 

 mously dividing, pronglike branches, small female ampullae, and 

 prominent dactylotome projections, larger than in any species except 

 zarhyncha. 



Description. — A nearly perfect colony was brought up on rock-cod 

 hues off Point Sur (25 miles south of Monterey Bay), Calif., from a 

 depth of between 50 and 90 fathoms. It rests on an UTegular, deeply 

 fenestrated base of dead hydrocoral thickly encrusted with sponges, 

 bryozoans, serpulid tubes, barnacles, brachiopods, and solitary corals 

 (Paracyathus) . The horizontal dimensions of the living portion are 

 265 mm by 130 mm; total height 180 mm; the living portion 100 mm. 

 There are very many subterete, round-tipped, one to four times 

 dichotomously branched prongs arising from the very ii-regular, 

 fenestrated, encrusting base, which, as above stated, rests on ''dead" 

 calcareous foundation. The main branches are 10 to 12 mm in 

 diameter; the terminal branchlets 4 to 6 mm. Small colonies from 

 off the Farallone Islands, Calif., have only a few branches and measure 

 35 to 75 mm in height. 



The branches are rough from very numerous scoop-shaped projec- 

 tions, outgrowths of the margin of the larger dactylopores. The 

 hollow of the scoop, which is the dactylotome, is oriented in every 

 direction around a cii'cle, and along its bottom is a slight ridge carry- 



