204 LIVERPOOL BIOLOGICAL SOCIETY. 
Amphilectus incrustans, Johnston. 
Halichondria incrustans, Johnston. 
Halichondria saburrata, Johnston. 
Halichondria panicea, Grant. 
Desmacidon incrustans, Schmidt. 
This species seems to be of world-wide distribution. 
Higgin* states that it has been found in the West Indies 
and Falklands Islands ; Bowerbank + records it from Frith 
of Forth, Hebrides, Orkneys and Shetland Islands, Welsh 
and Irish Coasts, Channel Islands, and Hastings. Further, 
it has been previously collected in two parts of our district, 
at Port Erin and Holyhead, and now I am able to add 
also Puffin Island to the list. 
This sponge has been described or mentioned by Grant, 
Johnston, Bowerbank, Carter, and Higgin under the genus 
Halichondria. But Oscar Schmidt recognized that it, to- 
gether with eighteen other of Bowerbank’s species of Halz- 
chondria, belongs to the Desmacidonide, and accordingly, 
in my ‘‘ Second Report,” &c., I called this sponge Desma- 
cidon incrustans. However, as I intend to follow Ridley 
and Dendy’s principles of classification as far as possible 
and to accept their definitions of genera, I find it now 
necessary to remove our species to the genus AmpdAilectus, 
‘Vosmaer,{ also one of the Desmacidonidee. In doing so 
I think it advisable to repeat what Ridley and Dendy say 
in regard to this genus :—‘‘ We make use of this genus in 
the manner indicated by its founder, namely, as a pro- 
visional receptacle for a number of doubtful Desmaci- 
donide.’’§ 
* Higgin, ‘‘ Report on the Porifera,” in ‘‘ Fauna of Liverpool Bay,” p. 84. 
+ Bowerbank, ‘ British Spongiade,” vol. ii., p. 249. 
+ For definition of the genus Amplilectus see Vosmaer, ‘‘ Notes from the 
Leyden Museum®*” vol. ii., p. 109. 
§ Ridley and Dendy, “‘ Report on the Monaxonida collected by H.M.S, 
Challenger,’ = py 23; 
