20 CRYPTOLARIA ELEGANS. 
the unfascicled portion of the hydrocaulus, are cylindrical throughout, pre- 
senting no diminution of their diameter towards the base as in C. conferta. 
They appear alsé to pass continuously into the tubes of the hydrocaulus, 
no distinct floor being apparent in the hydrothecee of any part of the 
specimen. 
The circular strie which surround the margin of the hydrothecx are here 
as in other species most probably indications of successive elongations occur- 
ring during the growth of the hydroid. 
Cryptolaria abies. 
Pi. XII. Figs. 1-3. 
Trophosome. — Hydrocaulus attaining a height of about two inches, irreg- 
ularly branched, with a pinnate disposition of the ultimate ramuli. Hydro- 
thecxe, where completely visible, near the ends of the branches where the 
fasciculation ceases, flask-shaped, adnate by somewhat more than half their 
height, and then bending outwards; margin circular, even, and without 
obvious annular striation. 
Gonosome not known. 
The hydrothecx of this species are considerably smaller than those of 
either C. conferta or ©. longitheca. They can be seen, too, in the distal, 
non-fascicled portions of the hydrocaulus, where they are fully exposed, to 
be of a very different shape from those of the two former species, being here 
of an elongated flask-shape, tumid below and gradually narrowing towards 
the orifice. Here also they are plainly provided with a distinct floor, and 
in all respects resemble a typical sertularian hydrotheca. In the fascicled 
portion of the stem, where they are in great part immersed and concealed, 
their form cannot be satisfactorily determined.* 
Cryptolaria elegans. 
Pl. XIV. Figs. 1, 2. 
Trophosome. — Hydrocaulus attaining a height of about an inch, delicate, 
pinnately and very regularly branched; pinne alternate fascicled only at 
their base or entirely monosiphonic. Hydrothece alternate, tubular, nearly 
cylindrical, narrow, adnate for somewhat more than half their height on 
the distal portions of the hydrocaulus, with the free part bending outwards 
* The label placed with the specimens of this species had become effaced, so that neither their exact 
statioh in the area explored nor the depth from which they were dredged could be ascertained. 
