498 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 84 



this report. Of Allopora norvegica paci-fica, A. boreopacifica, and 

 Errinopora stylifera I had already made illustrations. A. scabiosa 

 and A. solida of the Okhotsk Sea were new to me, but it has not been 

 deemed expedient to include figures of them at this late date since 

 they have been fully treated in Dr. Broch's memoir. 



GLOSSARY OF TERMS USED IN DESCRIPTIONS 



Ampulla: The cavity in the coeuosteum containing male or female gonophores 



or sexual members of colony. These often form blisterlike convexities on the 



surffice. 

 Coenosteum: The hard calcareous substance that constitutes the skeleton of 



colony, in contradistinction to the animal tissue which forma it. 

 Corallum: The calcareous skeleton of the colony as a whole. (Hydrophytum of 



Hicksou.) 

 Cyclosystem: The gastropore surrounded by a circle of dactylopores coordinated 



viith it. 

 Dactylopore: The small pore into which the dactylozooid retracts. 

 Dactylostyle: Ver}' tiny spicules along the wall of dactylopore. 

 Dactylotome: The shallow slits radiating from the margin of gastropore into 



which the dactylopores open. 

 Dactylozooid: The tentaclelikc, mouthless member of the colony, armed vAth 



abundance of nettle cells, which accompanies the feeding individual or 



gastrozooid. (PI. 70, fig. 2a.) 

 riabellum, flabellate, flabelliform: Fan, fan-shaped, in reference to the form 



of the colony. 

 Gastropore: The central depression of a cyclosystem (or the larger pore when no 



cyclosystem is differentiated) into which the gastrozooid retracts. 

 GaBtrostome: The mouth of t\\e gastropore. 

 Gastrostyle: The upright spiculated projection at bottom of gastropore forming 



also a projection into the gastric cavity of the polyp. 

 Gastrostyle chamber: A very narrow space surrounding the gastrostyle and 



sometimes separated from the portion of gastropore above style by a cheval- 



de-frise of spicules. 

 Gastrozcoid: The feeding polyp of the colony. 

 Gonophore: The sexual m.embers of colony lodged in a cavity or ampulla. Male 



and female gonophores are on separate colonies. 

 Planula: The specialized gastrula larva that may sometimes be found in "mature" 



female ampullae. One of its peculiarities is the possession of an abundance 



of nettle cells in the ectoderm. (Moseley, 1879, pi. 42.) 



Genus STYLASTER Gray 



Stylaster Gray, Zool. Misc., 1831, p. 36 (type: Madrepora rosea Pallas, 1766). 

 Eustylaster Broch, Danish /ngfoZf-Expcdition, vol. 5, pt, 5, p. 8, 1914 (type: 



Madrepora gemmascens Esper); Untersuchungen an Stylasteriden, pp. 9, 15, 



1936. 

 Stylaster has been used in the traditionul sense as a matter of con- 

 venience. I agree fully with Dr. Broch that there is no definite hiatus 

 betvvcen Stylaster and Allopora. Admitting this, I feel that it is 

 rather academic to reduce these time-honored groups to the status of 

 subgenera and then to employ a trinomial designation for every 



