248 BULLETIN OF THE 



Aglaophenia gracilis Allman. 



A very fine specimen of this form, seven and a hilf inches high, was 'dredged 

 in Lat. 24° 43' N. and Long. 83° 25' W. Depth, 37 fathoms. No corbulce 

 present. 



Aglaophenia rigida Allman. 



There are two specimens of A. rigida in the collection, — one of them, nearly- 

 stripped of its pinnae, is eight and a half inches in length ; the other is smaller, 

 but in much better condition. No corbuloe present. 



Localities. — Ten miles north of Zoblos Island. Lat. 24° 8' N., Long. 28° 

 51' W. Depth, 339 fathoms. 



NEMATOPHORUS S. F. Clarke, nov. gen. 



Trophosome. — Hydrosoma pinnate, plumose ; stem and pinnoe divided into 

 internodes. IIydrotheca9 adnate to the pinna), 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 ncmatophores, the hydrothecaj, 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 pinnae. The cauline ncmatophores, 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. rigs. 32-35. 

 Trophosome. — Ilydrocaulus 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 tliem bearing branchlets, and those 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 ])inna ; pinna) arrang(!d alternately, and arise from the 

 ujiper suiface of the branch ; they are Init very slightly arched, nearly in the 

 same plane, of a nearly ecpial length throughout the greater part of the branch, 

 becoming rather abruptly shorter near the distal end. Ilydrotheca) arranged 

 unilaterally upon the pinna), one to each internode, closely set, deep, slightly 



