446 E.ev. Canon Norman — A Month on 



known are from the Antarctic, the South Atlantic, or the 

 Australian Seas. 



" 13. Aplidium, sp. 



" Several small colonies, which cannot be identified with 

 any certainty." 



P L Y Z A. 



Having during previous dredgings in Norway paid much 

 attention to the Polyzoa, I had a lai'ge mass of material, 

 examined and unexamined, belonging to this Class from the 

 fiords. I did not therefore, on the present occasion, search 

 for incrusting species, but gave the time thus saved to other 

 things. The few incrusting forms in the following list were 

 accidentally noticed, but it will be seen that the arborescent 

 Polyzoa are of great interest. 



1. Menipea Jeffreysii^ Norman. (PI. XIX. fig. 1.) 



1868. Menipea Jeffreysii, Norman, " Notes on some rare British 

 Polyzoa, with Descriptions of new Species," Quart. Journ. Micr. Sci. 

 n. 8., vol. viii. p. 213, pi. v. figs. 4-8. 



1880. Menipea Jeffreysii, ^iTKiks, Brit. Marine Polyzoa, p. 42, pi. ix. 

 figs. 1, 2. 



Menipea Jeffreysii was described from two very minute 

 fragments, each about 2 millim. long, which were picked out 

 by the late Air. C. Peach from shell-sand dredged by Jefi'reys 

 and myself off Shetland and in the Minch. The description 

 of these worn fragments was therefore imperfect, and I will now 

 give full details of this very distinct species. 



Zoarium very transparent and glassy, arising from a single 

 stem composed of a coil of chitinous tubes, and attached by 

 the base usually to a small pebble or fragment of shell, 

 dichotomously branching, branches all in one plane. Zocecia 

 6 to 9 and sometimes more in each internode, aperture regu- 

 larly elliptical, occupying half the length of zooecium ; in 

 young cells armed in front with three long spines, the inner- 

 most much more slender than the others, but in older zocecia 

 this innermost slender spine has generally been broken off at 

 the base and is no longer perceptible, while the others remain 

 as short, more or less stumpy spines ; fornix (operculum) 

 attached near the upper end of the inner margin, very large, 

 convex, cap-like, and so closely fitted down to the aperture 

 that, viewed from above, it appears to be part of the cell, and 

 only careful lateral inspection shows the narrow open line 



