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4. 
DESCRIPTION OF THE PLATES. 
Proximal end of a pinna carrying a phylactogonium; magnified. 
(a) Pinna. ; 
(6) Phylactogonium with gonangia; female (?); front view. 
Portion of a phylactogonium from a point near its distal end, carrying a single young gonangium ; 
female (?); back view. 
Fig. 5. Portion of a pinna with a phylactogonium, magnified. 
6. 
(a) Pinna. 
(6) Phylactogonium with gonangia; male (?). 
Portion of one of the branches of a phylactogonium with two of its nematophores ; still further 
magnified. 
oh eo 
PLATE XXXIV. 
Figs. 1-5, Halicornaria speciosa. 
Natural size. 
A portion taken from a point towards the proximal end ; magnified. 
Same, from a point near the distal end. 
Portion of a pinna, still further magnified; front view. 
Same, lateral view. 
