220 LIVERPOOL BIOLOGICAL SOCIETY. 
whilst we all three differ from the older and perhaps 
incorrect observations. There can be no doubt whatever 
that Cliona sulphurea, Desor, 7s identical with Cliona celata, 
Grant. I will add that I have measured also the spicules 
of a boring form of Cliona celata from Puffin Island, and get 
the following results: most spicules about 0°36 by 0:008 
mim., a few smaller down to 0:27 by 0:003 mm. 
Polymastia mammillaris, Johnston. 
Several specimens of this were dredged on the “‘ Hyzena”’ 
expedition of May 25th, 1890, in Penrhos Bay (10 fathoms), 
off Rhoscolyn Beacon (12 fathoms), and off Porth Dafarth, 
Anglesey. ‘The largest of the specimens forms a globular 
mass with a diameter of 4cm. More than one hundred 
papille rise from its upper surface. The other specimens 
were slightly smaller and flatter. They all were of a bright 
orange-yellow. One small specimen was also collected at 
the east end of Puttin Island, June 18th, 1890. ‘This 
species had previously been dredged in Church Bay, near 
Holyhead. For description and figures see my former 
report. 
Polymastia robusta, Bowerbank. 
In my former report I recorded this species from Church 
Bay, Holyhead. We have dredged since two specimens of it 
on the ‘‘ Hyzena’’ expedition of May 25th, 1890, in Penrhos 
Bay (10 fathoms), and off Rhoscolyn Beacon (12 fathoms), 
on the west coast of Anglesey. The specimens are hemi- 
spherical masses, of a diameter of about 4°5 cm. in hori- 
zontal direction and 2 cm. in height. The colour of the 
one specimen was a dirty greyish-yellow; of the other one 
a pure orange tint. 
Order IV. TETRACTINELLIDA. 
Tethya lyncurium, Johnston. 
Five specimens of almost perfect globular form were 
