182 Mr. W. S. Kent on a new Vitreous Sponge. 
Fig. 10. me me two of the panas ThS greeny magnified, as seen 
a qua uarter-of-an-inch c und pow showing the spines 
on os Gace shafts and siereinitios ed ca sigmoid form ; 
b, circular form. Size about 1-400th of an inch long, zd about 
1-12000th of an inch thick. 
N.B. These mies have a double sigmoid or spiral curve, 
consisting of abou o turns of the Th a deg ut so 
different Tadividually that it is only here and there that a true 
igmoid form i 
not be made to lie flat on a eo 
Fig. 11. Teach ya permulti n. gen. et sp» dried pats half the specimen, 
natural size, upper surface: 
Fig. 12. The same, ener on of upper piia Brai pair i to show 
a, the depressions i in which the pores are situated ; b, the ridges 
Fig. 13. ue iid diagram > show the ice = nh large s iie small 
ules. 
Fig. 14. The same, horizontal view of vertical section of corre -— 
half of nd Eb mpm size, showing internal structure compose 
of :—a a ucles radiating gr groups o of spicules; b, herr i 
canal a aie of oscules in a depression in the low 
S 
This section also shows the dark-grey colour of in upper 
portion passing into the lighter one of the under surfac 
Fig. 15. The same, whorl or radiating group o tergo spicules, Ae mag- 
nified, to show their superticial arrangem the under sur- 
face a this sponge, and the piedras cres ence of the small 
: spicu 
Fig. 16. The iius the large and small spieules, relatively magnified : 
a, large spicule, stout, ern eed usiform, acerate ; b, real 
Saed, about 1- is h of pri greatest falie about 
3-1800ths of an inch 5 bone ie size of small s pice. dea dr 
smooth, fasiform, sunt (that is, nedhi shaped or poin 
one end and obtuse at the other). Size about 1-60th of à inch 
ong by about 1-1800th of an inch in its greatest transverse 
diameter. 
XVI.—Notice of a new Vi a nam Pheronema (Hol- 
tenia) Grayi. By W. SAVILLE KEN .S. 
of the Geological Doreehant British Muscat: 
THE recent dredging-expedition of the yacht * Norna, owner 
and commander Mr. Marshall Hall, F.G.S., in which I had 
the Ec of being associated with Mr. Edw. Field- 
ing, resulted in our bo ERE off Setubal, in addition to 
many other most interesting organisms, a ‘Vitreous sponge 
closely allied to Holtenia Carpenteri, Wyv.Thomson. At the 
time of taking it I strongly suspected it to be identical with 
M.S., 
