HYDROCORALS OF THE NORTH PACIFIC — FISHER 533 



d^. Colony encrusting, thin; cyclosystems small, the gastro- 

 style encroached upon by outgrowths from side of gas- 

 tropore, forming a style chamber. 

 eK Gastrostyle smaller, not completely filling style cham- 

 ber or the passage into gastropore proper papillosa 



e^. Gastrostyle more robust with more rounded summit; 



gastropore less funnel shaped and more cylindrical... petrograpta 

 ¥. Normally more than one gastrostyle in a majority of gastro- 



pores, usually 3 to 7 (upward of 12). Colony encrusting porphyra 



Genus CRYPTOHELIA Milne Edwards and Haime 



Cryptohelia Milne Edwards and Haime, Compt. Rend. Acad. Sci., vol. 29, p. 69» 

 1849 (type: Cryptohelia pudica Milne Edwards and Haime). 



CRYPTOHELIA TROPHOSTEGA, new species 



Plate 62, Figures 1-8; Plate 63 



Diagnosis. — Flabellum massive, with robust anastomosing branches 

 and large cyclosystems on both sides of colony; cyclosystems wide- 

 mouthed, rather shallow, with a small ventral chamber not in direct 

 communication with the 10 to 20 dactylopores ; hd, when fully grown, 

 nearly as large as extreme diameter of cyclosystem and containing 

 4 to 11 male ampullae or a single large female ampulla; very numerous 

 nematophores on all parts of colony. 



Description. — As compared with C. imdica Milne Edwards and 

 Haune (1850, p. 69, pi. 3, figs. 1-lc) (pi. 64, fig. 1) the colony is much 

 more massive in every respect and the cyclosystems are conspicuously 

 larger. Plate 63 shows the anterior face of type colony where cyclo- 

 systems are more numerous than on the back. Type, 110 mm high 

 and 150 mm wide; diameter of main trunks 17 to 20 mm; of branchlets 

 2 to 5 mm. 



The following figure references are all to plate 62. Cyclosystems 

 subcircular to oval, often irregular (fig. 7), the Hd slightly smaller, 

 convex, and of the same general contour (figs. 1, 7, 8). Rather fre- 

 quently the distal margin of the lid fuses to the edge of cyclosystem 

 in various ways (figs. 2, 7), leaving two lateral entrances to the cyclo- 

 system. The more distally situated cyclosystems have a definite 

 stalk (fig. 6) or have the margin slightly raised above the general 

 level of branchlet ; on the larger branches the margin is flush with the 

 general surface. The number of dactylopores is quite variable, 

 generally 10 to 20; usually in well-formed systems 16 to 20. 



The relation of dactylopores to gastropore, and form of latter, are 

 best appreciated from figures 4 and 5. The ventral chamber {vc) is 

 very small, and there is no conspicuous channel leading into it from 

 bottom of dactylopore as figured by Moseley (1879, pi. 35, fig. 7c) 

 for C. pudica (=C. moseleyi Hickson and England). The diaphragm 

 separating the upper from the lower chamber has a circular or occa- 



