Deep-sea and Shallow-water Hydrozoa. 7 



springing from a tangled mass of small tubular filaments; 

 pinnse alternate, distichous, extremely thin and slender, each 

 borne close to the distal end of an internode of the stem, 

 where it is supported by a long process much swollen at the 

 base ; the mode of jointing of the pinnae is most variable, the 

 proximal internode is short and destitute of hydrotheca, and is 

 often followed by one or two short internodes before the hydro- 

 theca-bearing internode, so that there may be one, two, or 

 three distinct internodes between the process of the stem and 

 the first hydrotheca-bearing internode ; the hydrotheca- bear- 

 ing internodes always long, frequently alternating with one 

 long non-hydrothecate internode, and not unfrequently with 

 two or three shorter ones, while, as frequently the internodes 

 which follow one another all bear a hydrotheca 5 in this latter 

 case the internodes are extremely elongated, and instead of 

 bearing the hydrotheca towards the centre of their length, 

 bear them near their proximal extremity. Hydrothecas very 

 small and shallow, their width and depth scarcely exceeding 

 the general diameter of the pinna. Nematophores extremely 

 numerous. Besides the pair placed at the sides of the hydro- 

 theca there is a single nematophore on the proximal part of 

 each hydrotheca-bearing internode, and in those cases in which 

 these internodes are much elongated and follow directly on 

 one another, two nematophores are placed at short distances 

 on their distal portion. On the long intervening internode 

 two nematophores are present, and when this is replaced by 

 two or more shorter ones, each then bears a single nemato- 

 phore. The proximal internodes which follow the process 

 bear a nematophore, and the internodes of the stem carry 

 ten or more ; of these, two are carried on each side of the 

 internode in a line above the pinn^, so that there are four 

 nematophores between successive pinnge on the same side of 

 the stem ; one is placed on each side of the proximal part of 

 the internode between the rows of alternate pinnae, while two 

 pairs are placed on the process which carries the pinna, one 

 at its upper and one at its lower end. 



The gonothecae are short, suboval or slipper-shaped, and 

 slightly curved to one side, with an oval subterminal orifice, 

 borne singly or in pairs on the swollen base of the processes 

 of the stem^ in the axils of the pinnae. 



In the dried specimens of this species a curious torsion of 

 the stem is observable, so that instead of there being two 

 straight rows of alternate pinnae, a complete spiral is formed 

 by these rows in about a length of 30 millim. In this state 

 the arrangement of the pinnae is singularly similar to what is 

 found in the genus Antennopsis, All man, which, judging by 



