66 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 43. 



the latter. Tlie scales on the branches are rather large plates, the 

 twigs themselves being thicker than usual. The scales often have 

 their edges imbricating. 



Color: The axis is a dull yellowish-olive, branches and calyces 

 light buffy-brown. 



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

 fathoms. Station 4895; Ose Saki Light, N. 42° E., 4.7 miles; 95 

 fathoms. Station 5070; Ose Saki, S. 8° W., L8 miles; 108 fathoms 

 (type). 



Type-specimen.— C&t. No. 29799, U.S.N.M. 



This species is distinguished from others of the genus by the size 

 and form of the calyces. 



Genus THOUARELLA Gray (modified). 



Colony usually flabellate and pinnate; ultimate twigs springing 

 from all sides of the branches, very numerous; calyces either isolated 

 or in whorls, club-shaped, seldom adherent to the branches; caly- 

 cular scales in 8 rows, at least distally.* 



THOUARELLA HILGENDORFI (Studer). 

 Plumarella hilgendorfi Studer, Monatsber. Akad. Wiss. Berlin, 1878, p. 648. 



Colony (incomplete) 14 cm. high and with a spread of 4.6 cm. A 

 single branch only is present in the specimen described, which gives 

 off numerous twigs from all sides so closely set that a spiral arrange- 

 ment can not be made out, and attains a length of 3.9 cm. Those 

 from the front of the colony are shorter, giving the whole specimen a 

 flabellate appearance. The calyces are in whorls or short spirals of 

 3, the summit of one not usually reaching the base of the one next 

 above. There are about 18 whorls to 2 cm. in length of branches. 



The individual calyces are rather slender cones, but slightly bent 

 toward the axis. Some are almost straight symmetrical cones, 1.3 

 mm. high to margin. Each circumopercular scale has a median 

 keel that is produced into a prominent point which is more pro- 

 nounced than in Versluys's description. The eight rows of scales 

 overlap laterally, so as to be obscured on proximal portions. There 

 are apparently 6 scales in the abaxial rows and 5 adaxials. The 

 operculum is concealed by the circumopercular scales. It is com- 

 posed of triangular flaps, the adaxial somewhat smaller than the 

 others, and with their ends overlapped by the ends of the others. 



The stem scales are thin and more or less imbricating. 



Color: The colony is light yellowish-brown. 



Localities.— Station ?4771; lat. 54° 30' N.; long. 179° 17' E.; 426 

 fathoms (fragment). Station 4895; Ose Saki Light, N. 42° E., 4.7 



> Some of the points in this definition are condensed from that given by Kinoshita, rrimnoidae von Japan, 

 1908, p. 21. 



