Dusrpen—WNotes on the Hydroida and Polyzoa. 309 
Triticella pedicellata, Alder. 
In the communication above mentioned, I also recorded (p. 133) 
this rare British species as having been trawled by the Royal 
Dublin Society’s Survey from two localities—off the Skelligs, depth 
80 fathoms, growing on Buccinum undatum and Natica catenularia ; 
and also off Slyne Head, depth 55 fathoms, on Trochus magus. 
Barentsia nodosa, Lomas. 
Also previously mentioned (/. c., p. 186) as being collected by 
the Royal Dublin Society’s Survey from Killybegs and Smerwick 
Harbour, growing on Alge. 
A block of limestone, perforated by boring molluscs, was 
trawled from the great depth of 500 fathoms, at a distance of 
45 miles off Blackrock, west of Ireland. It is interesting to note 
that the following species of Polyzoa were found encrusting it :— 
Schizoporella linearis, Hass., very abundant. Mucronella vario- 
losa, Johnust. Smittia reticulata, Macgl., and Diastopora patina, 
Lamk., in abundance. 
This is probably the greatest depth from which some of these 
forms are known. etepora Beaniana, King, was also trawled 
from the same depth at the same time. 
[ EXPLANATION OF Pure. 
