CRYPTOLARIA CONFERTA. Lyf 
In their slipper-shaped form the female gonangia come very near to those 
of H. Beanii. The orifice, however, in the latter is more exserted than in 
the present species. 
Halecium macrocephalum, in the suppression of its hydrophores, and in the 
great size of its hydranths, comes very near to JZ. sessile Nordman. It is, 
however, a much stouter form than H. sessile, which, moreover, judging from 
the figures and descriptions of that species, has a monosiphonic instead of a 
fascicled stem. 
As a rule, the hydranths are relatively large in the various species of 
Halecium, and this fact, taken in connection with the absence of a true 
hydrotheca, is not without significance. 
Trine SERTULARINA. 
Famity GRAMMARIDA. 
Genus CRYPTOLARIA Busx. 
Cryptolaria conferta. 
Pi. XII. Figs. 6+10. 
Trophosome. — Hydrocaulus attainmg a height of about two inches, much 
and irregularly or subdichotomously branched, fascicled except towards the 
terminations of the branches. Hydrothec adnate for somewhat more than 
half their height, and in the fascicled portion of their stem deeply immersed, 
then becoming free and arching outwards; adnate portion slightly narrowing 
downwards, free portion cylindrical, with circular and entire orifice behind 
which the walls are marked by several annular striz. 
Gonosome ? 
Dredged off Cojima, Cuba, from a depth of 450 fathoms. 
Cryptolaria conferta forms crowded entangled tufts. The proximal portions 
are strongly fascicled, but towards the extremities the fascicled condition dis- 
appears. Here the whole form of the hydrothecx is frequently visible, but 
farther down the greater part of every hydrotheca is immersed and con- 
cealed in the fascicled portion. 
The hydrotheca where fully seen in the non-fascicled portion of the hy- 
droid is found to have a distinct floor perforated by an offset from the coeno- 
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