114 Canon A. M. Norman — ISfotes on the 



54. Porella proboscidea, Hincks. 



1888. Porella proboscidea, Hincks, "The Polvzoa of the St. Lawrence," 

 Ann. k Mag. Nat. Hist. ser. 6, vol. i. p. 223, pl.xiv. fi?. 4. 



1895. Porella proboscidea, Nordgaard, " Systemat. forteg. Norge 

 Marine Polvzoa,"' Bergens Mus. Aarbog, 1894-95, no. 2, p. 25, pi. i. 

 fig. 4. 



Nordgaard records tliis species from Meliavn and Nordkyn. 



55. Porella /avis (Fleming). 

 Meliavn [Nordgaard). 



I take the opportunity of describing a Greenland Porella. 



Porella princeps, sp. n. (PI. IX. figs. 8-11.) 



1892. Mo7toporella spinulifera, var. preeclara, Hincks, " The Polyzoa of 

 the St. Lawrence," Ann. & Mag. Nat. Hist. ser. 6, vol. ix. p. 152, 

 pi. 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 

 zooecia sometimes subrotund. A large round avicularium 

 within the lip and not rising quite to its level, so that it 

 might be overlooked. The operculum (PI. IX. fig. 10) has 

 the form of three fifths of an oval, being rather longer than 

 broad, abruptly truncate below, the angles slightly 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 zooecia unite with one 

 oral opening ; but the usual abnormality consists in zooecia 

 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 '' l)lind " ; there may be as many as 

 seven to ten blind zooecia around and including the primary 

 zooecium (PI. IX. fig. 9), as well as many others scattered 

 throughout the zoarium. Ooecium buried below the surface 

 (PL IX. fig. 11). 



