PORIFERA OF THE UL.M.B.C. DISTRICT. DO 
dredged on the ‘‘ Hyena”’ expedition of May 25th, 1890, 
in Penrhos Bay (10 fathoms), and off Rhoscolyn Beacon 
(12 fathoms), on the west coast of Anglesey. The cortex 
of the living sponge was cadmium-yellow, its inner portion 
brown. The diameter of the specimens is 1°5 to 2 cm. 
One of them was covered with about thirty buds.* 
One specimen of this species had previously been dredged 
in Church Bay, Holyhead. 
Dercitus buckland?, Bowerbank. 
This sponge, which had already been recorded by Mr. 
Higgin under the name Dercitus niger, C., from Holyhead, 
has now also been discovered at Puffin Island. I found a 
few specimens of it at the entrance of the large cave on the 
north end of the island, at low spring tide, April, 1889. The 
largest of the specimens measures 3 cm. by 2 cm. in hori- 
zontal direction and 0°6 cm. in height. Colour, dark black. 
For an extensive list of the literature, and a revised 
description of this species, see Sollas.t+ 
Serriola compacta, Hanitsch (Pl. XIIL., figs. 1—4). 
In my former report on the Porifera of the L.M.B.C. 
District | I described and figured a new species of a tetrac- 
tinellid sponge under the above name, which I took to be 
the representative of a new family. But in doing so I fell 
into a serious error, and I have to thank Professor Sollas, 
D.Sc., for pointing out the mistake tome. The two layers 
which I described as ectosome and choanosome of one 
sponge are really two quite separate sponges, an encrust- 
ing Suberite and an encrusted Stellettid. ‘‘ Kach is,” as 
Prof. Sollas writes me, after having seen my preparations, 
“a separate individual, the Suberite is defined from the 
* Compare Bowerbank, ‘‘ British Spongiade,” vol. 11. p. 94. 
+ Sollas, ‘‘ Report on the Tetractinellida collected by H.M.S: ‘ Challenger,’” 
p- 108. 
£ Proc. Liverpool Biological Society, vol. iii., p. 169—172, pl. vu. 
