536 PROCEEDINGS OF THE NATIONAL MUSEUM vol.84 



dactyl otomes are bound together by a narrow lime-lattice, below 

 which the pores communicate with the spacious ventral chamber, the 

 walls of which are spongy and deeply fenestrated. There is no ledge 

 or diaphragm separating the ventral chamber from the part above, 

 as in trojihostega. 



The lid is occupied by a single large female ampulla wliich extends 

 into stem but not below. Its dorsal wall is stout and its mner surface 

 is spongy and fenestrated. The coenosteum is white, marked by fine, 

 rounded longitudinal ridges. There are no nematophore pits. 



This species is really robust. 



Genus ERRINOPORA Fisher 



Errinopora Fisher, Ann. Mag. Nat. Hist., ser. 10, vol. 8, p. 397, 1931 (type: 



Errina pourtalesii Dall) . 

 Protoerrina Broch, Einige Stylasteriden (Hydrokorallen) der ochotskischen und 



japanischen See, p. 59, 1935 (type: Protoerrina stylifera Broch). 



Diagnosis. — Resembles Errina (includmg Labiopora) in ha\dng a 

 gouge-shaped projecting lip to each major dactylopore but differs in 

 the presence of a well-developed spiculate dactylostyle ; no differ- 

 entiated cuplike cyclosystem, although where the pores are not 

 crowded several dactylopores encircle a gastropore; tip of gastrostyle 

 flush with surface or sunken in an undifferentiated depression; fewer 

 scattered tiny dactylopores without projecting lip; coenosteum spongy 

 reticulate supei-ficially, compact centrally. The channel of the 

 dactylostjde is not definitely oriented either toward the end of the 

 branch or in the opposite direction, as in most species of Errina. 



So far as now known, this genus is confined to the north Pacific region. 

 The most generalized or primitive species is E. stylifera (Broch). 



ERRINOPORA STYUFERA (Broch) 



Plate 65, Figure 1; Plate 69, Figures 3, 3a 



Protoerrina stylifera Broch, Einige Stylasteriden (Hydrokorallen) der ochotskis- 

 chen und japanischen See, p. 59, fig. 1, 1935; Untersuchungen an Stylasteriden, 

 p. 101, fig. 32, pi. 13, fig. 40, 1936. 



Diagnosis. — Colony subflabellate; branches coarse; color pale pink; 

 dactylotomes not very prominent; gastropores deep, the apertures not 

 sunken in concavities; gastrostyle broadly lanceolate, not reaching 

 mouth of pore; female ampullae very numerous, superficial, large, the 

 floor beset with numerous pronged spicules; coenosteal surface spongy. 



Description. — Tj'-pical colony 70 mm high and 70 mm broad, subfla- 

 bellate, with three principal branches, which divide dichotomously two 

 or three times, the branches diminishing gradually in size and ending 

 in rounded, sometimes slightly broadened tips. Diameter of trunk 

 10 by 15 mm; of terminal branches 4 or 5 mm. 



