50 MR. A. W. WATERS ON 
would be advisable to examine and make sections of some well- 
preserved specimens. 
The ‘“Ipmonga aTuantica,’ Forbes, from off Simon’s Bay, 
S. Africa, does not seem to me to be this species, and the small 
piece from Kerguelen is also open to doubt. 
With regard to EnratopHora, there is so much uncertainty 
about their determination, that attaching a name sometimes 
merely means that no characters are found by which separation 
can be made; also no doubt these simpler forms are older, and 
have a wider distribution than some of the more highly differ- 
entiated. 
In the present paper the genus Scrupocellaria is enlarged to 
include one or two species previously placed under Menipea, 
a genus which has incorporated some rather divergent forms. 
The Schizoporella hyalina, L., is considered to belong to 
Hippothoa, on account of the reproductive characters. 
The genus Porella is well represented in the Arctic Seas; and 
in this genus the opercula and mandibles are found of great use 
in separating the species, and the large ayicularian and oral 
glands may be found similarly useful. 
The Eschara elegantula of d’Orbigny is found, upon a com- 
parison of d’Orbigny’s specimen, not to be identical with Smitt’s 
Eschara elegantula, which is in consequence left as Porella saccata, 
Busk. 
The Arctic genus Rhamphostomella, Lorenz, has a more or less 
triangular or oval avicularium in the peristomial elevation, and 
usually has a denticle in the oral aperture. It seems more 
nearly related to Smttia than to Cellepora. 
The Cellepore all belong to the group separated off as 
Osthimosia by Jullien, and Schismopora by MacGillivray. Of 
the Retepore, one is purely Arctic and the other is thought to be 
the same as a Mediterranean species. 
1. Gemetiarta tortcata (Z.). (PI. 7. fig. 4.) 
A specimen from Ginther Sound, 10 fath., shows that there 
are creeping stolons, which at. short intervals have adnate 
zocecia somewhat resembling those of Pyripora catenularia, 
Jameson. The erect branches may for a time be simple tubes, 
or they may at once take the usual biserial form. I cannot agree 
with Mr. Hincks when he speaks of the shoots rising from 
bundles of fibres, as this is rather reversing the case, for from 
individual mature zocecia radicle fibres are produced which unite 
