BRYOZOA FROM FRANZ-JOSEF LAND. 95 
front, whereas the prominent small ovicells of C. coronopus from 
the Mediterranean have a number of large pores over the surface. 
C. incrassata has 17 tentacles. 
In the Southern hemisphere there are two solid cylindrical 
Cellepore. The C. conica, Busk, which does not differ much from 
O. avicularis, H., has two oral avicularia, the mandibles of which 
are semicircular, whereas in C. avicularis and C. coronopus they 
are triangular. There are spatulate vicarious avicularia, and 
perforate globular ovicells. The C. cylindriformis, Busk, has 
perforated ovicells, a large oral avicularium with triangular 
mandible rather to the side of the aperture, and also vicarious 
spatulate avicularia. 
Loc. Spitzbergen, 16-160 fath. (Sm.); Greenland (Sm.) ; 
Novaya Zemlya, 30-80 fath. (Sm.) ; Matotschkin Schaar, 30-50 
fath.; Kara Sea (Levinsen); Kola, 28--100 fath. (Sm.); Jan 
Mayen (Lorenz); Finland (Sm.); Norway (Nordgaard); 
Labrador, Davis Straits (H.) ; ? Newfoundland (d’Orb.). 
Jackson-Harmsworth Exp.: off glacier between Cape Gertrude 
and Cape Flora, about 30 fath.; Wilczek Land, 127 fath.; off 
Cape Mary Harmsworth, 53-93 fathoms. 
56. CELLEPORA PumiIcosa, Busk. (PI. 12. figs. 15, 16.) 
Cellepora pumicosa, Busk, Brit. Mus. Cat. p. 86, pl. cx. figs. 5, 6; 
Hincks, Brit. Mar. Polyzoa, p. 398, pl. liv. figs. 1-3; Waters, Ann. Mag. 
Nat. Hist. ser. 5, vol. iii. p. 198. 
As it is extremely doubtful whether C. pumicosa, Linn., is 
referable to this species, it will be best to accept the first reliable 
description and figure, and call it Busk’s species. The genus 
does not seem to be a genus of Fabricius, as it was previously 
employed by Linné. 
The specimens from Franz-Josef Land have larger zocecia than 
those from the Mediterranean and British seas, the avicularium 
is also larger, as are the opercula and mandibles. The ovicells 
are widely open, imperforate or with one, two, or three large 
pores. It seems almost impossible to find any satisfactory 
characters for separating C. pumicosa, B., C. armata, H., aud 
C. ramulosa, L.; but in what I have considered C. pumicosa the 
proximal border of the operculum is the arc of a circle nearly as 
large as that of the distal edge, whereas in OC. armata and C. 
ramulosa the distal edge fits into what may be called a wide sinus. 
In all, the oral rostrum may be much longer than is shown in 
any of the figures with which I am acquainted ; and in a specimen 
