10 Mr. J. J. Quelch on some 



Antennularia 'profunda^ n. sp. (PI. II. fig. 5.) 



Hydrocaulus fascicled at the base and springing from a 

 tangled mass of fine fibres, branched, erect, indistinctly or 

 rarely jointed below, more nmnerously so above, attaining a 

 height of more than 15 centim., and in the specimen obtained 

 remaining unbranched with subopposite pinnate ramuli for 

 nearly its whole height. At its upper end the ramuli lose their 

 pinnate arrangement and become irregularly placed, forming 

 four or six rows, two or three ramuli being often placed at the 

 same level and alternating with those above and below them, 

 but not closely crowded ; where this subverticillate arrange- 

 ment of the ramuli takes place, young branches on which the 

 ramuli have the same subverticillate arrangement begin to 

 develop. Eamuli thin and long, attached to a long process 

 of the stem, which is swollen below, jointed, each internode 

 bearing a hydrotheca, and having a length between three and 

 four times its diameter. Hydrotheca small and shallow, its 

 width being about equal to the diameter of the internode. 

 Nematophores very numerous, four on each internode of the 

 ramulus, one at its distal and one at its proximal part, and 

 two at the lateral margins of the hydrotheca, two pairs on 

 each of the lateral processes of the stems in the proximal 

 portions of the colony, and three pairs on those in the upper 

 portions, two on the proximal and three on the distal parts of 

 the stem above the point of insertion of each ramulus, while 

 lines of nematophores are found running up the stem between 

 the rows of the ramuli. In the axil of each ramulus is a 

 slight swelling with a small pore, apparently a base for the 

 attachment of gonotheca3. Gonothecge unknown. 



This species is close to A. ramosa, from which it differs 

 chiefly in its general habit, in the arrangement of the ramuli, 

 in the relative length and thickness of the internodes of 

 the stem and ramuli, and in the disposition of the nemato- 

 phores on the stem. It differs markedly in essential charac- 

 ters from A. Utrasticha^ which it much resembles in general 

 habit. It is close to A. norwegica^ but is easily distin- 

 guished by its branched hydrocaulus, its more verticillate 

 ramuli, by the relatively short and thick smooth internodes, 

 and the " number and disposition of the nematophores 

 throughout. 



Aglaophenia acacia. 

 .Uman, Challenger ' Hy( 



Numerous specimens were obtained which differ in unim- 



Aglaophenia acacia, AUman, Challenger ' Hydi-oida, pt. i. p. 38, pi. xii. 

 figs. 1-4. 



