1912-13.] Hydroids of British Antarctic Expedition, 1908. 13 
Family CoRYNiDiE. 
Clavatella (?) juv. 
A young specimen, the characters of which are so ill-defined that its 
genus is recorded with hesitation. It consists of a solitary polyp with well- 
developed, club-shaped head, about the middle of which occur six short 
capitate tentacles set in two whorls, and charged with large nematocysts. 
There is a short stalk, terminating in a still shorter hydrorhiza, which creeps c 
upon the perisarc of Sertularella cumberlandica. An exceedingly fine 
Fig. 1. — Clavatella (?) juv. on branch of Sertularella cumberlandica. x 87. 
perisarc clothes the hydrorhiza and hydrocaulus, and is crumpled at the 
junction of the latter with the hydranth, where it ceases. 
There is no trace of gonosome. 
Dimensions . — 
Hydrocaulus, length 
diameter at summit . 
Hydranth, length . 
diameter 
045 mm. 
0055 mm. 
0T9 mm. 
0T4 mm. 
Locality. — On Sertularella cumberlandica from Bay (east of Cape 
Boyds), 7-20 fathoms, June 1908. 
Family Tubularidje. 
Tubularia indet. 
The stems of a species of Tubularia occur in several collections, but 
there is present no key to specific identity. The perisarc bears closely set, 
regular, but very ill-defined annulations. 
Localities. — Cape Royds, 10-25 fathoms, and 20-30 fathoms, July 1908 ; 
