106 Mr. H. J. Carter on new Sponges. 
tened and setose above, cylindrical below ; palpi castaneous, 
with the terminal article black. banded with white, flattened 
and setose ; falces piceous, castaneous at the base and above, 
with the basal half densely covered with white pilosity ; 
movable claw tipped with reddish castaneous; teeth appa- 
rently as in the preceding species ; maxille and labium oliva- 
ceous, with whitish anterior borders; pectoral shield black, 
with a few appressed white hairs, heptagonal. Length (in- 
cluding cephalothorax) 11 millim., of lateral anterior abdo- 
minal processes 14 millim. 
East coast of Madagascar. 
EXPLANATION OF PLATE VI. 
Fig. 1. Ceerostris ecclesiigera 3, natural size. 
Fig. 1a. Abdomen (from behind), of twice the natural size. 
Fig. 16. Palpus. 
Fig. 1c. Tarsal claws of first pair of legs. 
Fig. 2. Ceerostris ecclestigera 9 , natural size. 
Fig. 2a. Abdomen (from behind), natural size ; 2 6, profile, 
Fig. 2c. Tarsal claws of first pair of legs. 
Fg.3. Cerostris extrusa 2, natural size. 
Fig. 3a. Caput, showing eyes and tubercles. 
Fig. 3b. Tarsal claws of first pair of legs. 
Fig. 4. Cerostris Cowant 9 , natural size. 
Fig. 4a. Tarsal claws of first pair of legs. 
Fig. 5. Cerostris excellens 2 , natural size. 
Fig. 5a. Tarsal claws of first pair of legs. 
Fig. 6. Cerostris retorta 9, natural size. 
Fig. 6a. Profile view. 
Fig. 6b. Tarsal claws of first pair of legs, 
XII.—New Sponges, Observations on old ones, and a proposed 
New Group. By H. J. Carrer, F.R.S. &e. 
Order II]. PSPAMMONEMATA. 
Fam. 1. Bibulida. 
Group 1. EHusPoNneiosa. 
Euspongia compacta, n. sp. 
Thin, horizontal or vertical, extending concentrically from 
a pedunculated or contracted irregular base, terminating at 
the circumference in an irregularly-fissured round margin. 
Consistence that of very compact felt. Colour dark fawn 
when fresh, light fawn or grey after exposure when dry ; der- 
