22 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.43. 



Locality.— Stsition 4807; Cape Tsiuka, S. 58° W., 10.3 miles; 44-47 

 fathoms. Station 4815; Niigata Light, S. 25° E., 21.5 mjlm: 70 

 fathoms. 



General distribution. — Korea Straits and Tsugaru Straits, Japan 

 (Brundin). Misaki, Sagami Bay, Japan (Kiikenthal). 



NIDALIA GRACILIS, new species. 

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



Colony unbranched, slender, 8.2 cm. in height. The stem is very 

 short, being but 1.5 cm. long with a diameter of 8 mm., while that of 

 the widest part of the colony is 6 mm. 



The stem is forked below and spreads out in lobular processes which 

 are adherent to the two sides of a flat shell, and is both longitudinally 

 and transversely corrugated. 



The polyps are more sparsely distributed than in N. rubra, often 

 being as much as 3 nun. apart, and scattered over all sides of the rod- 

 like polypiferous part of the colony. 



The individual calyces attain a height of about 2 mm. and a 

 diameter of 2.5 mm. at the base. The summit is 8-lobed and the 

 walls contain numerous rodlike spicules which appear like granules 

 under low magnification. These spicules are very small, terete, 

 densely tuberculate spindles. 



The polyps are retractile, but many of them are fairly well expanded 

 in the type. The distal parts are expanded so as to appear as if borne 

 on pedicels. The polyp extends 2.5 mm. above the calyx margin, 

 and about 2 mm. of this is included in the tentacular mass, which is 

 about 1.5 mm. in diameter. The polyp walls have a few transversely 

 disposed red spindles at the bottom, eight double rows arranged en 

 chevron above these, vertical spindles on the distal part forming 

 vertical bands extending to the tentacle bases. The distal parts of 

 the tentacles show no spicules. 



Spicules: These are of two main types. 1. Rather slender but 

 highly tuberculate spindles found in the polyp walls and the general 

 coBnenchyma; 2. Very short, oval, much tuberculated spicules which 

 sometimes intergrade with •round, or even stellate, forms. 



Color: The stem is yellowish-brown; the general ccenenchyma and 

 sides of calyces rather dull red; the margins of the calyces yellow; 

 and the polyp bodies, below the tentacle bases, yellow, while the 

 polyp head is white. 



Locality. — Station 4946; Okiko Jima, N. 31° E., 4 miles; 39 fathoms. 



Type-specimen.— Cut. No. 30101, U.S.N.M. 



Genus BELLONELLA Gray. 



Colony unbranched, rod-like or conical. Calyces largely included, 

 verruciform. Spicules often stars, crosses, and other branched forms. 



