NO. 1923. DESCRIPTIONS OF PACIFIC ALCYONARIA— NUTTING. 57 



The number of polyps to the internode and the color of the polyps 

 are distinguishing marks of this species. 



FAMILY PRIMNOIDiE. 



Colonial Gorgonacea with calcareous roots. Axis calcareous or 

 horny, but never with alternating calcareous and horny joints. 

 Calyces with opercula composed of 8 scales. Polyps often in whorls, 

 their walls covered with scale-like spicules. 



Siabfamily CALYPTROI^HORIlNr.-^ "Versluys. 



Calyx spicules reduced to two or three pairs of large scales.* 

 Operculum conspicuous, turned toward branch when the polyp is 

 retracted. 



Genus CALYPTROPHORA ^A'^right and Studer (emended 



by Versluys). 



Calyx body with but two pairs of very large scale-like spicules 

 usually entirely encircling the polyp. 



CALYPTROPHORA IJIMAI KinoshitB. 



Plate 16, figs. 2, 3. 



Calyptrophora ijimai Kinoshita, Ann. Zool. Japan, ser. 6, vol. 3, 1907, p. 234. 

 Arthogorgia membranacea Kukenthal and Gorzawsky, Japanische Gorgoniden, 

 Teil I, 1908, p. 29. 



Colony 10.5 cm. in height. The first branch arises 8 mm. above 

 the base. The branches are pinnately arranged, alternate, undivided 

 and erect, originating at an acute angle with the main stem and 

 sometimes attaining a length of 7 cm. Diameter of the main stem 

 1.3 mm. The branches are attenuated and straight, ending in a mere 

 thi'ead. 



The axis has a light green iridescence near its base, where it is 

 apparently striated. There is no luster in the axis of stem and 

 branches. 



The polyps are in whorls of 4 or 5, all facing downward. The whorls 

 are about 2 mm. apart. Calyces 2.2 mm. in height (measured parallel 

 with the branch) and project about the same distance from the branch. 

 Both the basal and distal pairs of spicules form incomplete rings, 

 failing to meet on the stem side, and in both the individual spicules 

 of a pair are cemented together. The distal pair bears four sharply 

 pointed spines projecting nearly 1 mm. from the free fluted border. 

 This pair is about 1.6 mm. long to base of spines. 



The basal pair bears two very slender, often curved, spines pro- 

 jecting nearly 2 mm. beyond the border. This pair is almost 2 mm. 



> In some cases there are a few additional scales of small size near the base of calyx. 



