NO. 1923. DESCRIPTIONS OF PACIFIC ALCYONARIA— NUTTING. 23 



BELLONELLA FLAVA, new species. 



Plate 2, figs. 4, 4a; plate 18, fig. 3. 



Colony a single, thick, unbranched, curved stem, 4.4 cm. in height, 

 round, with a greatest diameter of 1.1 cm. The basal nonpolyp- 

 iferous part is like a turgid collar around the base, 4.5 mm. high and 

 12 mm. in diameter. The polyp-bearing part is somewhat terete in 

 side view, with a rounded end. The polyps are emplanted on all sides 

 on low rounded eminences averaging about 3 mm. from center to cen- 

 ter. The axis of the stem is traversed by large cylindrical cavities, or 

 conspicuous longitudinal canals. The intervals between the rounded 

 eminences, or verrucae, and the verrucse themselves are marked by a 

 mesh of wrinkles which checker the whole surface, the wrinkles being 

 mainly longitudinal and transverse. The calyces are marked by 

 eight strong longitudinal lobes or corrugations, ending at the margin 

 which closes over the retracted polyp. The calyces near the margin 

 are 1.5 mm. in diameter; and the infolded margins are lobed, and 

 yellowish ^n color. 



There is a weU-marked collaret of small red spindles in several 

 transverse rows. The tentacle bases are armed with similar spindles 

 arranged en chevron, and the distal portions of their dorsal surfaces 

 bear three or four rows of similar spindles longitudinally disposed, 

 forming a rosette when the retracted polyp is viewed from above. 



Spicules: These are all small, the prevailing types being double 

 heads and double crosses. Sometimes the double heads are flattened 

 so as to resemble the ''coUar-button" spicules of the genus Behryce. 

 There are a few relatively large slender spindles wdth sparsely dis- 

 tributed thorny points on their surfaces ; these are white and yellow. 



Color: General surface dull, light yellow, brighter on the calyces, 

 polyp spicules bright carmine red. 



Locality. — Station 4894; Ose Saki Light, N. 41° E., 5 miles; 95 

 fathoms. 



Type-specimen.— Cat. No. 30089, U.S.N.M. 



This species differs from Nidalia rubra (Brundin)^ not only in color, 

 but also in the spicules, particularly those of the tentacles. 



Genus ANTHOMASTUS Verrill. 



Colony mushroom-shaped, with a thick rounded head on a short 

 round sterile stem. Polyps large and completely retractile. Zooids 

 present, between the polyps. 



I Alcyonarien aus der Sammlung des zoologischen Museums in Upsala, 1896, p. 6. 



