PORIFERA. II. 87 



attempt to interpret the given spicula-figures, would, I suppose, show figs. 3, 7, 8, 9, 11, and 12 on PI. IV 

 to belong to the present species, but the interpretation is doubtful. 



Locality: The Ingolf, station 112, 67° 57' Lat. N., 6° 44' Long. W, depth 1267 fathoms (bottom 

 temperature -=- i°i C.|; station 113, 69° 31' Lat. N., 7 06' Long. W., depth 1309 fathoms (bottom tempera- 

 ture -f-i°oC); and at 60° 19' Lat. N., 5 39' Long. E., depth 620 fathoms (bottom temperature ca.-^-o°i5C.) 

 (Ad. Jensen, the cruise of the Michael Sars 1902). The two first localities are situated in the Nor- 

 wegian Sea about between Jan Mayen and Iceland, the last one in the Faroe Channel. 



Geogr. distr. Besides on the mentioned localities, the species, as before mentioned, has been 

 taken by the Norwegian North-Atlantic Expedition at station 31, 63° 10' Lat. N., 5 J 00' Long. E., depth 

 417 fathoms. Presumably it has been taken at more places by this expedition, but, at all events, 

 always in the cold area. Accordingly the species is known from the Norwegian Sea and from the 

 Faroe Channel with a bathymetrical range from 417 — 1309 fathoms, and it occurs only on cold bottom. 

 I supijose that the species is also found among the Cladorhiza-iorm* from the Faroe Channel mentioned 

 by Wyville Thomson in the Depths of the Sea 112 — 113. 



3. C. tenuisigma n. sp. 

 PI. Ill, Figs. 2—5. PL XII, Fig. 4 a— e. 



1885. ? Cladorliiza abyssicola Armauer Hansen, The Norwegian North-Atlantic Exp., XIII, Spongiada;, 

 partim, PI. IV, fig. 14, PL VII, fig. 11. 



Slender, with branches issuing from a central stein, the branches oftenest distinctly in one plan 

 tn two sides, most frequently long and ending in a swelling. The branchlets more or less distinctly 

 arranged in a ring-like manner. The stem ending below in a richly branched roof. The skeleton of the 

 generic type. Spicula: Megasclera styli o-j8 — roi"""; microsclera of three forms, anisancorcr unguifcra* 

 with five teeth 0-024 — 0-028""", sigma/a of two forms, fine ones of the common form 0-038 — 0-048""". sig- 

 mata with compressed terminal parts 0-048 — o'ojd""". 



In the exterior and skeletal structure this species is very similar to the preceding one, but it 

 is distinguished by characteristic differences as well in the exterior as in the spiculation. It is formed 

 of an erect stem ending below in a densely and richly branched root. In the specimens in hand that 

 are possessed of the root it is formed in such a way, that the stem continues quite down to the lower 

 part of the root, and only here is divided into branches, while from the lower part of the stem thicker 

 close-set branches continually pass of, and again subdivide to a high degree. The finest branches end with 

 the thickness of one spicule. In the specimens in hand the radical branches issue only to one side, so 

 that the whole radical tuft is turned to that side (PI. Ill, fig. 3). To the radical branches, especially to 

 their outer part, some bottom material, as pebbles and especially Foraminifera in great numbers, is 

 attached. These bodies stick rather firmly, and seem to be kept by the spongin present in the root. 

 Lateral branches issue in the common way from the stem. These branches issue with varying intervals, 

 and ma} 1 in this respect issue in a rather irregular manner; sometimes, however, they are placed in a tole- 

 rably regular way. They go off at about a right angle or are a little directed upward. The branches may 

 be of varying length, but generally they are very long. In a few cases the branches may again carry 



