114 Canon A. M. Norman—WNotes on the 
54. Porella proboscidea, Hincks. 
1888. Porella proboscidea, Hincks, “The Polyzoa of the St. Lawrence,” 
Ann. & Mag. Nat. Hist. ser. 6, vol. 1. p. 223, pl. xiv. fig. 4. 
1895. Porella proboscidea, Nordgaard, “Systemat. forteg. Norge 
Marine Polyzoa,” Bergens Mus. Aarbog, 1894-95, no. 2, p. 25, pl. 1. 
fig. 4. 
Nordgaard records this species from Mehavn and Nordkyn. 
55. Porella levis (Fleming). 
Mehavn (Nordgaard). 
I take the opportunity of describing a Greenland Porella. 
Porella princeps, sp. un. (Pl. IX. figs. 8-11.) 
1892. Monoporella spinulifera, var. preclara, Hincks, ‘ The Polyzoa of 
the St. Lawrence,” Ann. & Mag. Nat. Hist. ser. 6, vol. ix. p. 152, 
pl. viii. fig. 3. 
-Zocecia of immense size, the largest known to me, measur- 
ing 1 millim. long and 0°6 to 0°7 broad, ovate or oblong, 
moderately convex, with deep separating sutures; shell- 
substance very massive and surrounding the oral opening 
like a collar; no oral spines; frontal surface punctate all 
over; origelles of slightly larger size are round the base. 
Oral opening well arched above, truncate below, but in old 
zocecia sometimes subrotund. A large round avicularium 
within the lip and not rising quite to its level, so that it 
might be overlooked. The operculum (Pl. IX. fig. 10) has 
the form of three fifths of an oval, being rather longer than 
broad, abruptly truncate below, the angles shghtly rounded 
off; from the angles proceeds a bar, for the attachment of 
the muscles, which bends a little inwards and then passes 
two thirds of the length of the operculum upwards, at some 
little distance from the margin. Colour rich rosy red. 
A peculiarity of this species is the frequent presence of 
many aborted cells; in one case two zocecia unite with one 
oral opening ; but the usual abnormality consists in zocecia 
having no room to grow among their large surrounding 
brethren, and consequently reduced in size, squeezed into all 
sorts of irregular shapes; many of these have an oral 
opening, many are quite “ blind” ; there may be as many as 
seven to ten blind zocecia around and including the primary 
zocecium (Pl. 1X. fig. 9), as well as many others scattered 
throughout the zoarium. Ocecium buried below the surface 
(Pl Xe ie a) 
