248 Transactions of the Monthly Microssopleal 
irregularly throughout the interpolar region, seemingly as an addi- 
tional protection ; we may naturally presume that the last-mentioned 
form is simply a more advanced condition of the first. 
Aphrocallistes Bocaget, E. P. Wright. 
In the January number of the ‘Quarterly Journal of Micro- 
scopical Science’ for this year, Professor Percival Wright describes 
and figures a very beautiful reticulated sponge under the name 
above given, at the same time he is not quite certain of its dis- 
tinctness from an earlier described species A. Beatria (J. E. Gray), 
in consequence of the specimens he examined being denuded of 
the minute and characteristic sarcode spicula. This late expedition 
has resulted in our obtaining a perfectly fresh specimen of this 
elegant sponge, and its examination enables me to fully substan- 
tiate its specific distinctness from Aphrocallistes Beatriz, as also to 
fill in many links missing in my friend Professor Percival Wright’s 
description. Dr. Oscar Schmidt has likewise recently examined this 
species with results entirely at union with my own. As Professor 
Wright remarks, the “areas formed by the reticulated skeleton are 
much more regularly hexagonal in this species than in A. Beatria, 
and the “spines (prolongations?) on the bosses” are much more 
attenuate. But it may be added that the whole skeleton is much 
more slender, and is wanting in that echinate aspect of the bosses 
and shafts of the radii, characteristic of A. Beatriz. The spicula 
of the sarcode are also very different, the “porecto multiradiate ” 
spicules are not wanting as Professor Wright imagined, and which 
in fact appear to constitute the type form of the genus; but there 
are none of the verticillately spined ones so abundant in A. Beatriz ; 
while, on the other hand, Aphrocallistes Bocagei is at once recog- 
nized by the abundant presence of hexradiate spicula, having one 
extremity of the shaft profusely spinous and accordingly bearing a 
close resemblance to those that occur in Pheronema Grayi, the 
opposite extremity of the shaft being frequently very attenuate, 
as shown at Plate LXV., Fig. 10: the terminations of all the 
other radii are usually more or less minutely and erectly spined. 
Dr. Bowerbank figures a spiculum of A. Beatria belonging to the 
same type,* but the terminations of the radii are quite smooth, and 
the form is scarce comparatively to what obtains in Aphrocallistes 
Bocaget; this latter feature I remark after careful examination of 
examples of both species. 
Farrea occa, Bowerbank. 
A fragment of this species was first figured and alluded to by 
Professor Owen in his eloquent description of the matchless Huplec- 
tella aspergillum,{ where it is described as the basal mass of some 
* ‘Proc. Zool. Soc.,’ pl. xxii., 1869. 
+ See ‘Trans, Linn. Soc.,’ vol. xx., pl. xxi. 
