248 BULLETIN OF THE 
Aglaophenia gracilis ALLMAN. 
A very fine specimen of this form, seven and a half inches high, was dredged 
in Lat. 24° 43’ N. and Long. 83° 25 W. Depth, 37 fathoms. No corbula 
present. 
Aglaophenia rigida ۰ 
There are two specimens of A. rigida in the collection, — one of them, nearly 
stripped of its pinne, is eight and a half inches in length ; the other is smaller, 
but in much better condition, No corbula present. 
Localities. — Ten miles north of Zoblos Island. Lat. 24° 8’ N., Long. 28° 
61 W. Depth, 339 fathoms, 
NEMATOPHORUS $. T. CLARKE. nov. gen. 
Trophosome. — Hydrosoma pinnate, plumose ; stem and pinnæ divided into 
internodes. Hydrothece adnate to the pinne, unilateral. A peculiar rounded 
process at the base of each, pinna, with a small opening on the median line 
near the inner or proximal end. Supra-calycine, mesial, and cauline nemato- 
phores present. 
Gonosome. — Not known. 
This genus is closely allied to Aglaophenia as seen in the arrangement of the 
calycine nematophores, the hydrotheez, and in the general habit ; but is sepa- 
rated from these, as it is from all other forms, by the peculiar processes borne 
on the bases of the pinna. The cauline nematophores, too, in the single spe- 
cies known, are of such a peculiar character that I think it possible there may 
prove to be something of genetic value in them. 
Nematophorus grandis sp. nov. 
Plate V. Figs. 32-35. 
Trophosome. — Hydrocaulus large, tree-like, polysiphonic, attached by a 
dense network of creeping hydrorhizal filaments, black and thickest at the 
base, changing to light horn-color as it tapers towards the distal end ; attains 
a height of twelve inches in the finest specimens, sparingly branched ; branches 
alternate, arising from the upper surface of the stem ; those given off near the 
base are largest and resemble the main stem in all particulars, the upper ones 
shorter, all of them bearing branchlets, and these are also branched always alter- 
nately; branches and branchlets all gracefully curved, all polysiphonic at the 
base and tapering towards the distal end, where they become monosiphonic ; 
branches and branchlets divided by transverse nodes into short internodes, each. 
of which gives origin to a pinna ; pinne arranged alternately, and arise from the 
upper surface of the branch ; they are but very slightly arched, nearly in the 
same plane, of a nearly equal length throughout the greater part of the branch, 
becoming rather abruptly shorter near the distal end. Hydrothecæ arranged 
unilaterally upon the pinne, one to each internode, closely set, deep, slightly 
