13 



long, expanded, lobular limestone processes, extending laterally from the bottom of the stem. 

 One of these processes is nearly 5.6 cm. in length, and 5 mm. wide at its broadest point. The 

 greatest diameter of the axis, near base, is 3.3 mm. The shortest (basal) internode is 3.5 mm. 

 long, and the longest (4 th from base) 3.3 cm. The horny nodes are short, and the longest (basal) 

 one is 3 mm. in length. Average length about i mm. The polyps are biserially arranged, in 

 general, although this is occasionally interfered with by one situated on the front or back of 

 the colony. They all curve upward toward the distal end of the colony, with their adaxial sides 

 almost contiguous with the ccenenchyma of the stem ; the summit of one reaching to, or slightly 

 beyond, the base of the one next above. 



The individual calyx is columnar or cylindrical in form, but many are swollen with ova 

 in their proximal portion. A typical one is 6 mm. in height to the end of the crown of points, 

 and 2.5 mm. broad at the slightly expanded margin. There is usually one conspicuous, needle- 

 like spicule placed vertically in the abaxial side of the calyx, reaching nearly from the base to 

 the summit, but ordinarily not projecting beyond the margin, and attaining a length of 5 mm. 

 There are also eight vertical spicules in the distal part of the calyx wall, whose points form a 

 conspicuous crown, as in C. paucispinosa. Aside from these there are very few if any spicules 

 in the calyx walls. Spicules appear to be wanting both in the tentacles and the general ccenen- 

 chyma of the stem, which is quite thick and fleshy. 



Spicules. I find but the one kind, the slender, needle-like form described above as 

 occurring in the calyx walls. Their surface is covered with regular, but rather sparsely disposed, 

 minute, thorny points. 



Color. The colony, when the ccenenchyma and the calyces have not been stripped 

 from the stem, is a rather bright reddish brown. The axis is pure white, except at the nodes, 

 which are dark brown. 



This fine species differs from C. paucispinosa, its nearest ally, in length of calcareous 

 internodes, size and disposition of polyps, and in the spiculation, being without spicules in the 

 tentacles and ccenenchyma. It differs from C. nuda Wright and Studer in size of spicules, and 

 in having no tentacular spicules, as well as in size of internodes. 



4. Ceratoisis sp.^. 



Stat. 122. i58'.5N., i25o'.5E. Between Menado and Biaru Island. 1264 1165 m. Stony bottom. 



A fragment of denuded axis from Station 122 differs from all the other species in the 

 collection in the length of the single calcareous internode which is 9.9 cm. long and has a 

 diameter of 2.5 mm. The surface is regularly but not deeply furrowed or fluted longitudinally. 

 The horny node is 23 mm. long. 



The axis approaches the characters of Ceratoisis grandis Nutting from Hawaiian waters x , 

 which has internodes up to 14 cm. in length. The writer, however, does not feel justified in 

 identifying species on the characters of the axis alone. 



1 Proceedings of the U.S. National Museum, Vol. XXXIV, p. 570, 1908. 



