CRYPTOLARIA LONGITHECA. 19 
merely a parasitic hydroid we should have in these bodies a gonosome 
without its correlative trophosome. Further, the tubular base from which 
the gonangia spring forms a close irregular plexus which embraces the fas- 
cieled stem of the supporting hydroid, and I believe I have traced a com- 
munication between this plexus and the cavities of the outermost tubes of 
the stem. ; 
If we admit the reasonableness of this view, we may compare the entire 
hydroid to a Coppinia in which the trophosome, instead of consisting of 
a number of sessile hydrothec intercalated among the gonangia of the 
gonosome, as in the only known species of Coppinia, is further differentiated, 
and assumes the form of a branching hydrocaulus with the hydrothece 
distributed along its length. 
I do not wish, however, to lay too much stress on this view. I do not 
feel that I have been able to place beyond all doubt the reality of a com- 
munication between the tubular base of the incrusting body and the tubes 
of the stem, while the fascicled condition of the stem increases the difficulty. 
Against its constituting the proper gonosome of the supporting hydroid, 
may also be urged the facts of its irregular form and of its sometimes ex- 
tending in such a way as to embrace a portion of more than one branch, 
exactly as a foreign incrusting growth might do. The question, however, 
of its exact relation to its associated hydroid must await for its solution 
the examination of recent specimens. 
Cryptolaria longitheca. 
Pl. .XIII Figs. 4, 5. 
Trophosome. — Hydrocaulus attaining a height of about two inches, pin- 
nately but not profusely branched ; fasciculation disappearing towards the 
ends of the branches. Hydrothecx cylindrical, adnate in the non-fascicled 
portion for about half their height, then becoming free and bending out- 
wards; margin circular and even, surrounded by annular striz. 
Gonosome not known. | 
Dredged off Double-Headed Shot Key from a depth of 315 fathoms. 
Cryptolaria longitheea is a far less profusely branched species than C. conferta, 
and from this species it further differs in the pinnate disposition of its 
branches and in being a stronger form with larger hydrothecw. The hy- 
drotheex, moreover, where a complete view of them can be obtained, as in 
