SPONGES FROM THE ABROLHOS ISLANDS. 485 
(6) Large oxea (PL 26, fig. 6 a), echinating the outer surface of: the 
sponge ; stout, curved, often crooked, especially the outer part, the inner 
portion being straighter and tapering more gradually ; fairly sharply pointed 
at each end ; measuring up to 1'2 by 0'06 mm. 
(7) Oxea of the peristomial fringe ; very long and slender, hair-like, 
usually broken oE ; measuring up to 2*3 by 0'009 mm. ; outer ends hastate, 
very sharply pointed. 
It is quite possible that this species may prove to be identical with one or 
other of two species in the Hamburg South-west Australian collection for 
which the late Mr. Row proposed the names Vosmaeropsis dendi/i and 
V. primitiva. These names are given in Dendjf and Row's " Classification and 
Phylogeny of the Calcareous Sponges" [1913], but no descriptions have yet 
been published. Beyond the fact that the species in question belong to the 
same section of the genus as T". mackinnoni, it is impossible at the present time 
to say anything about them, as the specimens have been sent to Japan for 
further investigation by Dr. Sanji Hozawa. 
Register No. and Locality. IV. 1, Wooded Isle. 
9. Grantiopsis cylindeica Bendy. (PI. 25. figs. 5, 6, 7, 8; PL 26. fig. 7.) 
Hypograntia infreqiiens Carter [1885-6]. 
Grantiojisis cylindrica Dend^' [1892, 1893 A]. 
Grantiopsis cylindrica Dendy & Row [1913]. 
Grantiopsis infrequens Dendy & Row [1913]. 
There are five specimens in the collection, which vary slightly in size and 
appearance ; each consists of a single p)erson only. 
R.N. I. 1 (PL 25. fig. 8) is typical ; it is attached to a rock by its base, and 
forms a slightly curved, cylindrical tube, 20 mm. long and 5 mm. in diameter, 
with a slightly constricted, terminal osculum, almost without fringe ; the wall 
of the tube is 1 ram. in thickness. The surface is almost smooth, with a 
characteristic glistening appearance due to the presence of the large 
tangential triradiates. Colour in spirit almost white ; texture firm and 
compact, but brittle. Other typical specimens are shown in figs. 5-7. 
The skeleton arrangement, the form and size of the spicules, and the canal 
system agree closely with those of the type of the species as described by 
Dendy [1892], and a detailed description is therefore not necessaiy. As, 
however, the spicules have not as yet been figured separatelj^ but only in the 
transverse section given by Dendy [1893 A], we take this opportunity of 
supplementing his description with the necessary illustrations (PL 26. 
fig. 7, a-li; vide also Description of Plates). 
In their " Classification and Phylogeny of the Calcareous Sponges " [1913] , 
Dendy and Row have pointed out that Carter's Hypograntia injrequens is 
undoubtedly a species of Grantiop sis, hui, according to Mr. Row's observations 
on material collected by the Hamburg South-west Australian Expedition, 
