REPOET ON THE HYDROIDA. 29 



Gonosome. — Gonangia carried by each branch of the hydroclaclia near to the bifurca- 

 tion, pyriform, supported on a short peduncle, and with a basal segment which carries a 

 pair of laterally placed nematophores. 



This fine species forms wide flabelliform tufts with rather rigid stems, and with the 

 hydrocladia nearly an inch in length. The hydrocladia are each supported on a short 

 process of the stem ; to this is articulated the first segment of the hydrocladium ; this 

 segment is very short, is destitute of hydrotheca, and is immediately followed by a long 

 segment in which the bifurcation takes place, and which carries in the angle of bifurcation 

 a hydrotheca without nematophores. One branch of the bifurcation always commences 

 by a short internode destitute of hydrotheca ; every other internode of the branches 

 carries a hydrotheca. 



Besides the form here described, there occurs also a variety (see fig. 3), in which the 

 hydrothecal ramuli scarcely exceed half the length attained by these ramuli in the typical 

 form. 



The typical form was dredged in Christmas Harbour, Kerguelen, from a depth of 100 

 fathoms. The variety with short hydrocladia was dredged also ofi^ Kerguelen Island, from 

 a depth of 10 to 60 fathoms. 



Schizotricha multifurcata, n. sp. (PI. VII. figs. 4, 5). 



Tropliosoine.. — Colony attaining a height of about nine inches ; stem sparingly 

 branched, fascicled, rooted by a mass of entangled filaments ; hydrocladia alternate, 

 attaining about four-tenths of an inch in length, bifurcating three, four, or a greater 

 number of times. Hydrothecse with even margin adnate to the internode by their 

 entire height, flanked by a pair of lateral nematophores, and also subtended by a similar 

 pair of nematophores on the same internode, a hydrotheca without nematophores carried 

 in the angle of every bifurcation. 



Gonosome. — Gonangia carried by the internodes of the hydrocladia, each springing 

 from a point situated laterally, and just below a hydrotheca, pyriform, supported on a very 

 short peduncle, and having a wide basal segment which carries a pair of nematophores. 



This is a very graceful species, with flexile stems much longer and less profusely 

 branched, and with shorter hydrocladia than in Schizotricha unifurcata. A remarkable 

 feature in the specimen examined consisted in the hydrothecal internodes, carrying at the 

 proximal side of the hydrotheca a pair of laterally situated nematophores, instead of the 

 azygous mesial nematophore usual in the Eleutheroplean Plumularidae. The gonangia 

 also, besides the two nematophores which were always present on its basal segment, often 

 carried here a third one. This fact, however, scarcely seems to be constant. 



In every bifurcation one of the branches is connected with the internode from which 

 it springs, by a short internode destitute of hydrotheca, but carrying a pair of nemato- 

 phores. 



