REPOET OX THE HYDROIDA. 
41 
Gonosome not known. 
Locality. — Honolulu ; depth, 20 to 40 fathoms. 
The very regularly pinnate disposition of the ramuli, and the absolutely distichous 
and regular disposition of the hydrothecse, give to this species an aspect of consider- 
able elegance. It is a strong growing form with rather close-set, stout, and short 
hydrothecae. 
It is an inhabitant of rather shallow water, having been obtained from a depth of 
between 20 and 40 fathoms ; one of the specimens had adherent to it a species of the 
Rhizopodous genus Myriotrema — a characteristic littoral form. 
Cryptolaria crassicaulis, n. sp. (PI. XIX. figs. 3, 3a). 
Trophosome. — Colony attaining a height of four inches, profusely and very irregularly 
branched main stem, and primary branches very thick. Hydrothecse alternate and 
distichous. 
Gonosome not known. 
Locality. — Station 344, off Ascension Island ; depth, 420 fathoms. 
The present species is remarkable for the profuseness and irregularity of its ramifica- 
tion, and for the great thickness of its stem and principal branches. The ultimate 
branches on the other hand are slender and flaccid. The hydrothecse are stout, and the 
exserted portion rather long. Here and there, and at uncertain intervals, slight constric- 
tions may be noticed in the branches. 
Cryptolaria geniculata, n. sp. (PI. XX. figs. 1, la, 1&). 
Trophosome. — Colony attaining a height of three inches or more, irregularly branched, 
stem and branches rather rigid, very regularly geniculate. Hydrothecse alternate, 
distichous, springing from the salient angle of every geniculation ; orifice with two 
membranous valves. 
Gonosome. — Gonangia somewhat flask-shaped, each occupying the entire interval 
between two successive geniculations of the stem, to which it is adnate by nearly the 
whole of its epicauline side. 
Locality. — Station 173, off Matuku, Fiji Islands; depth, 315 fathoms. 
Cryptolaria geniculata is, of all the species of Cryptolaria, the most strongly defined, 
— so distinct is it indeed that one might almost be justified in assigning it to a new 
generic group. The valvular orifice of the hydrothecse affords in itself a striking character, 
while the singularly geniculate form of the stem is a condition not met with in any other 
known species of Cryptolaria. 
(ZOOL. CHALL. EXP. PART LXX. — 1888 .) 
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