1897 - 98 .] Prof. D’Arcy W. Thompson on Marine Faunas. 333 
Crisia eburnea , (L.). — Busk refers a specimen in the Chal- 
lenger collection from Kerguelen Island to this common northern 
species under the name of G. eburnea var. laxa. Two other species 
of the same genus are described from Kerguelen Island by Busk in 
“Bep. Antarctic Exp.,” Phil. Trans., vol. clxviii. p. 197, and 
various species are known from all parts of the world. The diffi- 
culty of identifying the various forms is well illustrated by Mr 
Harmer’s elaborate paper, “ On the British Species of Crisia,” 
a J. M. S., 1891, pp. 127-181. 
Diachoris magellanica , Busk. — This species is known from 
Kerguelen, Straits of Magellan, and the Australian region, and 
has been identified by Mr Busk with D. Buskii , Heller, from the 
Adriatic ( Bry . Adriatica , 1867, p. 93). 
Escliaroides verrucidata , (Smit). — Brought by the “ Challenger ” 
from the neighbourhood of Heard Inland, and identified with 
Cellepora verruculata , Smit, from the West Indies. The species is 
also said to occur in the Mediterranean (Waters, A. and M. N. H. 
(5), iii. 193). 
Hornera violacea , Sars. — This is another northern species with 
which Busk identifies a specimen from 75 fathoms in the neigh- 
bourhood of Heard Island. 
Hornera lichenoides, (L.). — This widely distributed northern 
species is recorded by Busk from 600 fathoms off the mouth of the 
Biver Plate. 
Pustulipora delicatula , Busk. — Becorded from Kerguelen and 
from Australia, and, with a mark of interrogation, also from 
Madeira (cf. B. M. C ., “Polyzoa,” pt. iii. p. 20). 
Pustulipora proboscidioides, Smit. — A West Indian species 
with which Busk identifies a specimen from Kerguelen 
Island. 
Pustulipora proboscidea, M. E. — A Mediterranean and Atlantic 
form with which is identified a specimen from Heard Island. 
Pustulipora deflexa , Smit. — A European species with which is 
identified a form from the neighbourhood of Heard Island. Mr 
Busk says: — “ On the whole it seems extremely doubtful what name 
should be assigned to the form here described, with respect to 
which all that appears to me to be certain is, that the specimens, 
mere fragments, in the Challenger collection are identical with 
