20 PERCY SLADEN TRUST EXPEDITION 
(4) Gastral cortical triradiates, considerably more slender than the dermal tri- 
radiates; as described and figured by Row (fig. 3, d; misprinted 3, a in the text). 
(5) Large oxea; piercing the sponge wall at right angles and sometimes projecting 
from both gastral and dermal surfaces. The outer end is very characteristically hastate, 
much flattened and with a backwardly projecting tooth or barb on one side only, 
something like a crochet needle. Row’s figures of this spicule are fairly characteristic, 
but the barb in my specimens may be more strongly developed. 
(6) ‘Trichoxea; slender hair-like oxea projecting from the dermal surface. These 
spicules are not mentioned by Row but they occur in his preparations as well as in my 
own. They do not appear to be true microxea. 
In drawing up the above notes I have had the advantage not only of examining 
Mr Row’s original preparations, but also of consulting him personally, and I am glad to 
say that he entirely agrees with me on all points. 
As so little is known of the external form of the species, I give a photograph of one 
of the ‘‘Sealark” specimens (Plate 2, fig. 6). 
Previously known Distribution. Red Sea. 
iequster, Nos Uocahity, atc) xxi, ALB, (©) Providencey4 0:05) as) sae 
78 fathoms. 
Family Grantiide Dendy (emend.). 
Flagellate chambers ranging from elongated and radially arranged to small, 
spherical and irregularly scattered. With a distinct dermal cortex and a proper cortical 
skeleton of tangential radiates, sometimes supplemented by, and occasionally replaced 
by, oxea. Skeleton of chamber layer ranging from regularly articulate to irregularly 
scattered. Subgastral sagittal radiates typically present. No subdermal pseudosagittal 
triradiates. Subdermal quadriradiates, if present, always associated with a chamber-layer 
skeleton of confused triradiates. Nuclei of collared cells probably always apical. 
Genus GrantTIA Fleming (emend.). 
Canal system syconoid. Colossal longitudinal oxea, if present, projecting from the 
surface. Tubar skeleton articulate, composed of radiate spicules which may or may not 
be supplemented by oxea. 
Srction C. 
With both large oxea and microxea. 
10. Grantia indica n. sp. 
(Plate 2, fig. 3; Plate 4, figs. 4, 5.) 
This beautiful little sponge is represented in the collection by two specimens of 
closely similar appearance. I select for description of the external form the one re- 
presented in the photograph (Plate 2, fig. 3), which I have labelled B, the other, A, 
having been used for microtome sections and spicule preparations. 
