BXPLANATION OBS PLA LE i: 
Fics. 1, 2, 3, 4. Cliona annultfera, sp. nov. 
1.—Part of type-specimen extricated from the shell in 
which the sponge had burrowed, viewed from below 
as an opaque object, X ca. 30. g. = gemmule: s. 
= space from which shell-substance has been re- 
moved. 
2.—A single chamber mounted, without staining, in 
Canada balsam and viewed from one side by trans- 
mitted light, X ca.57- 1.p.=/inhalent papilla: 
m. p. = mixed papilla: G.—gemmule. 
3.—Another chamber stained with borax carmine and 
similarly mounted, seen from above by transmitted 
light, X ca. 57. Lettering as in figs. r and 2. 
4.—A mixed papilla, viewed obliquely from one side as.a 
solid object, more highly magnified. c.—=calcare- 
ous granules. 
» 5,0. Thoosa investigatoris, sp. nov. 
5.—Part of type-specimen extricated from the shell in 
which the sponge had burrowed, viewed from above 
by transmitted light, x ca. 35. e.p. = exhalent 
papilla: hv. = horny ring surrounding papilla: 
n.g.== commencement of a new gallery: s. = space 
from which shell-substance has been removed. 
6.—Another part of the same sponge only partially 
extricated, viewed obliquely by transmitted light, 
and more highly magnified. 7..== inhalent papilla: 
S.= fragment of shell. 
