40 THE VOYAGE OF II.M.S. CHALLENGER. 



Aglaojyhenia, however, being tlie longest-establisliecl and the largest of tlie Statoplean 

 genera, may, in the absence of any strong reason to the contrary, be made to receive 

 it until the discovery of the gonosome shall decide its true generic allocation. 



The specimen is fragmentary, the hydrorhizal extremity being absent. 



Dredged ofl' Zamboanga, Philippines, January 30, 1875, from a depth of 10 fathoms. 



Lytocarpus, Kirchenpauer. 



Aijlarrphenia (section Lijtorarpia), Kirchenpauer, Aljhandl. aus deni Gebiete der Naturwiss. von 

 dem naturwiss. Vcrein in Hamburg, Band v. 1872. 



Generic Character. Trophosomc. — Stem doul^ly or singly pinnate. Hydrothccaa 

 with serrated or undulated margin, and with the mesial nematophore opening externally 

 Ijy one or two orifices. 



Gonosome. — Phylactocarps always open, consisting of modified hydrocladia which 

 never form corbulse. 



Kirchenpauer has given the name of Li/tocarpia to a group of phj'lactocarpal Plumu- 

 laridse, which he regards as a subordinate section or sub-genus of Aglaophcnia, while 

 he takes as a t^-pe of the section the Aglaophenia myriophyllum , Linn.' The forms thus 

 separated possess very definite characters, and I believe it will be better to regard them 

 as constituting a true genus of equal value with Aglaophenia. As such I have here 

 united a number of Challenger species, which I believe may be properly associated with 

 those In-ought together l)y Kirchenpauer in his section Lytocxivpia. I have found it, 

 however, necessary to modify, to a certain extent, Kirchenpauer's definition, and have 

 changed the termination of the name so as to bring it more into accordance with the 

 usual form of greueric desionations. 



The Plumularidce belonging to the genus Lytocarpus, while their trophosomes rarely 

 differ from those of the Aglaophenice , have very differently formed gonosomes. In l)oth 

 Aglaophenia and Lytocarpus the phylactocarp is a modified hydrocladium. In 

 Aglaophenia the modification results in the formation of two series of flat leaflets, which 

 almost always become intimately united by their edges, so as to form a closed corbula in 

 which the gonangia are included, or, if not actually united, still lie so close to one 

 another that the corbula thus produced forms a sort of cage in which the gonangia are 

 contained exactly as in the closed form. In Lytocarpus, on the other hand, true 

 corbulse do not occur, and the leaflets of the latter are replaced by more or less cylin- 

 drical or sabre-shaped or spine-like appendages, which are never united to one another so 

 as to form a closed chamber. 



' Kirchenpauer, he. cit., p. 20. 



