Manchester Memoirs, Vol. Ixi. (igi6), Xo. I. 13 



A rough transverse section through the nodes shows (i) a 

 fairly thick cortex, densely crowded with yellow spicules, (2) 

 the great mass of the section consisting of fairly soft brown 

 fibrous tissue, with large canals, and with some small, white, 

 rod-like spicules, and (3) a central part, not very well defined, 

 with a few^ yellow spicules, and with while rods. The struc- 

 ture of the internodes resembles the last, but the second area 

 is replaced by hard, white, calcareous tissue, without canals, 

 and the central part is better defined. 



A'lost of the spicules are yellow spindles and clubs, but 

 there are also short, narrow, white rods, without processes. 

 The spicules of the nodes consist of a dense mass of clubs, 

 spindles, and more irregular forms, as well as smooth rods. 

 The spindles may be approximately straight, or much curved, 

 their ends are not much pointed. The clubs have broad, ex- 

 panded processes, and lead on to more irregular spicules, which 

 have lost the lower part of the club, or the latter has become 

 broadened out. The spindles are from 0.075 "^ 0.027 to o. iqS x 

 0.057 m.m. The clubs are from 0.081 x 0.041 to o.iSg x 

 0.081 mm. The irregular spicules are from 0.075 ^ 0.063 '^^ 

 0.135 ^' 0.086mm. The rod-like spicules of the outer part of 

 the axis of the nodes has chiefly rod-like spicules aboiit 0.108 

 in length, and about 0.013 ^^ breadth. The inner part of the 

 axis has a few yellow spindles, clubs, irregular spicules, and 

 many small white rods. In the mternodes the spindles are fewer, 

 and the clubs and irregular spicules are the most conspicuous 

 forms. .l\s in the nodes, there are rod-like spicules in the inter- 

 nodes. The spindles are from 0.063 x 0.039 to 0.162 x 

 0.054 mm.; the clubs from 0.108 x 0.104. to 0.081 x 0.063 mm.; 

 irregular spicules from 0.079 ^ 0.054 to 0.I/.17 x 0.072 mm. The 

 rods are approximately the same size as those of the nodes. 

 On account of the incompleteness of the specimen, and the 

 absence of polyps, it appears unwise to give the examj^lc a 

 specific name. 



Locality, etc. — Vasco da Gama, N.W., v N., 8 miles. 

 Depth, 41 fathoms. Collected by dredge, Nature of bottom, 

 rocks. Date of collection, April 27th, igoo. 



Wrightelia trilineaia, sp.n. 

 Pla/e /!'., Fig. i ; Plate 1'., Fig. 3. 



The specimen is small, mainly red in colour, but with 

 reddish-brown nodes, and white or yellowish polyj)s. The 

 colony is 66 mm. in height, and about 53 mm. in breadth. 



The branching is nearly dichotomous, but is not com- 

 pletely so, as for example, a slight anastomosis occurs near the 

 base. The branching is almost entirely m one plane, and the 

 distinction between nodes and internodes fairly prominent. 

 The distance between the base and the first node is about 



