20 CEYPTOLARIA 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 also to pass continuously into the tubes of the hydrocaulus, 

 no distinct floor being apparent in the hydro thecas of any part of the 

 specimen. 



The circular striae which surround the margin of the hydrothecae are here 

 as in other species most probably indications of successive elongations occur- 

 ring during the growth of the hydroid. 



Cryptolaria abies. 

 PI XIIL Figs. 1-3. 

 Trophosome. — Hydrocaulus attaining a height of about two inches, irreg- 

 ularly branched, with a pinnate disposition of the ultimate ramuli. Hydro- 

 thecae, 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 hydrothecae of this species are considerably smaller than those of 

 either C. conferta or C. 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, narrowiug 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; pinnae alternate fascicled only at 

 their ))ase or entirely monosiphonic. Hydrotheca? 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 outwaixls 



* Tlic label placed with the spociiiu'iis of this spocii-s ha«l boconie effaced, so that noitlier their exact 

 station in the area exi)lore(l nor the depth (roni which they were dredged could be ascertained. 



