40 THE VOYAGE OF H.M.S. CHALLENGER. 
Aglaophenia, however, being the longest-established and the largest of the 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 beime absent. 
Dredged off Zamboanga, Philippines, January 30, 1875, from a depth of 10 fathoms. 
Lytocarpus, Kirchenpauer. 
Aglaophenia (section Lytocarpia), Kirchenpauer, Abhandl. aus dem Gebiete der Naturwiss. yon 
dem naturwiss. Verein in Hamburg, Band y. 1872. 
Generic Coaracter. TZ'rophosome.—Stem doubly or singly pinnate. Hydrothecze 
with serrated or undulated margin, and with the mesial nematophore opening externally 
by one or two orifices. 
Gonosome.—Phylactocarps always open, consisting of modified hydrocladia which 
never form corbule. 
Kirchenpauer has given the name of Lytocarpia to a group of phylactocarpal Plumu- 
laridee, which he regards as a subordinate section or sub-genus of A glaophenia, while 
he takes as a type 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 brought together by Kirehenpauer in his section Lytocarpia. Ihave 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 generic designations. 
The Plunularide belonging to the genus Lytocarpus, while their trophosomes rarely 
differ from those of the Aglaophenia, have very differently formed gonosomes. In both 
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 
corbule 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, loc. cit. p. 20. 
--.- al" 
