NO. 1923. DESCRJPTTO^'8 OF PACIFIC ALCYOl^ARIA—NUTTIWG. 41 



according to interpretation. The well developed caljces are further 

 from the mid-dorsal line than the developing calyces, which lie in 

 rfuch a way that each developing calyx is supported as it were on its 

 lower and outer side by a full-grown one. A well developed calyx is 

 2.3 mm. high on its outer side, and reduced to almost nothing on the 

 side next the rachis; and about 1.5 mm. in diameter. Its walls are 

 filled with vertical needles which project in conspicuous points 

 beyond the margin. Some of them have two very large points and 

 others four smaller ones. Still others have no regular points. On 

 the proximal part of the rachis there is but a single row of calyces 

 on each side. Many of the developing calyces have their distal 

 portions pointed, the spicules closing over the apertures by meeting 

 at the apex of a cone. 



The polyp tentacles have each a broad band of several rows of 

 vertically disposed barhke spicules which are very conspicuous. 



Zooids : The zooids are smooth, brown, yellowish bodies, quite 

 distant from each other. The plan of distribution seems to be, one 

 on the inner and dorsal, and another on the latero- ventral side of each 

 calyx base; but this order is not constant, although there are gener- 

 ally two to each calyx. 



Spicules: These are of two general types. The ordmary needle- 

 like form in the calyces and general surface of the rachis, and the 

 barlike spicules seen in the tentacles. 



Color: The stem is very light straw color; the calyces have a faint 

 pinkish or purplish tinge due to the showing through of the dark 

 brown bodies of the polyps. The tentacles are v/hitish. 



Locality. — Station 4984; Benkei Mizaki Light, S. 3° W., 15 miles; 

 248-224 fathoms. 



General distribution. — Type-locality, Lofoten, Norway. Also re- 

 ported from Tynemouth, England. 



The specimens in the collection agree in essentials with the defi- 

 nition of the genus SticTioptilum Grieg, which Jiingersen regards as the 

 young of Halipteris. From the latter author's discussion, I regard 

 this specimen as the young of Halipteris christii. 



Family UMBELLULID^. 



Poh^ps very large, without calyces and borne in a cluster at the 

 end of a very long and slender stem. 



Genus UMBELLULA Lamarck. 



Being the only genus in the family, it bears the characters of the 

 UmbellulidsB. 



