A476 Mr. A. W. Waters on 
specimens of Crisia, no doubt eburneo-denticulata, with 
fairly long straight internodes with seventeen to thirty-one 
zocecia, the joints yellow, the zocecial aperture 0-07 mm., the 
base of the internode or branch 0°11 mm., the zocecial aper- 
ture projects but very little. There are no complete ovicells, 
but two are commencing at the end of branches. In one of 
these internodes one branch is after the seeond zocecium, 
another after the sixth on the other side, and soon after this 
the ovicell commences ; in the other case the ovicell is about 
the same distance up the internode, in which there is only 
one branch, and that after the second zocecium, with an- 
ovicell on the other side by the sixth to seventh zocecium. 
The zocecia are about 0°45 mm. apart, and the number of 
surface-pores is about the same as in the northern forms 
of C. eburneo-denticulata. 
Ortmann’s description would seem to refer to eburneo- 
denticulata ; however, the figure shows wide branches, but 
the scale is too small to attach much importance to this 
difference. 
Loc. Spitzbergen, 70-96 fath. (Busk), Barents Sea, 
150 fath. (V.) ; Cette (Calvet) ; Japan? (Urt.) ; Franz Joset 
Land (?), 130 fath.; Granville Bay, West Greenland, 30- 
AO fath.; Kola Bay, 40 fath.; Smeerenberg; Rekiavie ; 
Castrensis Ode, 30-40 fath. ; Naples. 
Crisia sigmoidea, sp.n. (Pl. XVI. figs. 9, 10.) 
Crisia denticulata, Waters, Bry. of the Bay of Naples, Ann. & Mag. 
Nat. Hist. ser. 5, vol. iii. p. 269, pl. xxiii. fig. 2 (1879). 
This species I have from Naples, Rapallo, &c. The 
branches are very wide, with an “intermediate space,” and 
in general appearance it closely resembles C. conferta, Busk, 
but no ocecial tube has been seen on any of the ovicells. 
Harmer alludes to sigmoid curves in his C. elongata, which 
sometimes occur to a certain extent in C. denticulata, Lamx., 
though in this last not pronounced as in the present species. 
The ovicell, of which but a limited number have been seen, is 
wide and short, and there are usually two branches on the 
same side near to the ovicell. The oceciopore is a slit, as in 
C. denticulata and C. elongata, Harmer. 
The basis rami is ‘t wedged in,” corresponding in this 
respect to C. denticulata; but the joints are light, whereas 
in C. denticulata they are black. ‘The base of the branch is 
wide (0°1 mm.). The branches start after the first, second, 
or third zocecium on that side, frequently two originating 
from the same side, just as in C. elongata, Harmer, while in 
