16 SYDNEY J. HICKSON anp F. H. GRAVELY. 
Species B. 
(Plate IIL, fig. 17.) 
Localities. —W.Q., Hut Point, November 13th, 1902. W.Q., Hut Point, 
September 27th, 1902. East end of the Barrier, January 29th, 1902; 100 fms. 
Three specimens of a solitary (?) coryniform hydranth were found in the 
bottles containing hydroids from these localities attached to the sponge spicule 
débris. The hydrocaulus is 3°5 mm. in length. The hydranth is 2 mm. in height 
and 0°6 mm. in diameter, cylindrical in shape, with short scattered capitate 
tentacles 0°3 mm. in length. The proximal end of the hydrocaulus is covered by a 
chitinous perisare and gives off 3 or 4 hydrorhizal filaments (fig. 17, hrh. f.), for 
attachment to the sponge spicule débris. No gonophores are present. 
Bonnevie describes a solitary form, Coryne gigantea, from Hammerfest (7: p. 15), 
but this species differs from our specimens in having a hydranth longer than the 
hydrocaulus and in having the tentacles arranged in groups of three or four 
instead of singly. 
There is some reason for believing, from the evidence afforded by these 
specimens, that at least two species of Corynidae occur in the Antarctic Sea. 
This is an interesting conclusion, as no specimens of the family were obtained 
by the ‘ Belgica’ or ‘Challenger’ expeditions, nor has the family been discovered 
yet in the Falkland Islands. Hartlaub (10: pp. 505-509), however, describes two 
species of Coryne, one species of Syncoryne and one species of Gemmaria from the 
coasts of Chili, ete. 
It is also noteworthy that these few specimens are the only Hydrozoa in the 
collection with capitate tentacles ; it is therefore quite certain that they are not detached 
zooids from other large colonies that we have found in the collection, and improbable 
that they represent initial stages in the life history of these large colonial forms. 
FAMILY CORYMORPHIDAE. 
The genera belonging to this family that are sufficiently well known to be 
generally recognised are Branchiocerianthus, Monocaulus, Corymorpha, Lampra, 
Gymnogonos, EHeterostephanus. 
The genus Branchiocerianthus (Mark 15 and 16) appears to be perfectly distinct, 
and does not offer any difficulties to the systematist. Corymorpha (M. Sars, 1835) 
and /leterostephanus (Allman) differ from the other genera in producing in both sexes 
free medusiform gonophores. Allman (2: pp. 395-6) introduced the genus Monocaulus 
for the species with adelocodonic gonophores described by Sars as Corymorpha glacialis, 
and he included in the same genus Corymorpha pendula (Agassiz) and the giant 
deep-sea species Monocaulus imperator. 
