PORIFERA OF THE L.M.B.C. DISTRICT. 209 
(0°3—0°53 mm. by 0:012 mm.) and spined styli (0°148 
mm. by 0:008 mm). The former generally spring from 
the inner portions of the fibres, and at less acute angles 
(about 25°), whilst the spined styli have their bases more 
in the outer portions of the fibres and spring at greater 
angles (about 50°) from the fibres. There are also two 
kinds of microscleres—toxa (0°124 mm. by 0:002 mm.) and 
extremely minute chele (0°012 to0°016 mm). The micros- 
cleres are irregularly scattered through the tissue between 
the ascending fibres. 
A very brief description of this species has also been 
given by Carter.* 
Avinella mammillata, n. sp. (Pl. X., figs 3—5). 
I was doubtful for some time in which genus of the 
family Axinellide, the new sponge described below, should 
be included. At first I was rather inclined to make of it 
a new species of Faspailia, Nardo, but as Ridley and 
Dendy + propose to reserve the genus [aspazlea exclusively 
for the whip-like forms, I decided to place the new sponge 
under the genus Aaimella, Schmidt.{ Still in doing so I 
do not feel great satisfaction, as the genus Ainella seems 
at present to be a receptacle for all Axinellide which do 
not belong to the more clearly defined genera: Hymenia- 
cidon, Phukellia, Ciocalypta, Acanthella, Raspailia, Dendropsis, 
and Thrinacophora. Ridley and Dendy say, in regard to 
the genus Awinella, ‘‘ Sponge typically ramose, but may 
be massive. Skeleton fibre plumose. Megasclera stylote 
and sometimes oxeote. No microsclera. This is a very 
critical genus, and it is impossible to give a satisfactory 
* Carter, ‘‘ Annals and Mag. Nat. Hist.,” fourth ser., vol. xvi., p. 195, 
and fifth ser., vol. vi., p. 40. 
+ Ridley and Dendy, ‘‘ Report on the Monaxonida, collected by H.M.S. 
‘Challenger,’” p. 178 and p. 188. 
+ Oscar Schmidt, ‘‘ Spongien des Adriatischen Meeres.” 1862, p, 60. 
