308 CANON A. M. NORMAN ON THE POLYZOA 



spines, which may be presumed to be connected with the ovicells. They are 

 extremely fragile, and are very easily abraded. 



Hemicyclopora multispinata. Bush. B,, H.,W. (PL 42. figs. 6, 7.) 



1861. Lepralia multispinata^ Busk, Quart. Journ. Micr. Sci. vol. ix. p. 78, pi. 32. 



fig. 5. 

 1903. Lepralia discrepans, Jullieu & Oalvet, Result. Camp. sci. Prince de Monaco, 



xxiii. Bryozoaires, p. 72, pi. 10. fig. 1. 



This species is very closely allied to H. polita, Norman {:= Discojjora 

 emucronata, Smitt) of northern seas. The genus is allied to Escliarella 

 { = Mucronella) but is without the denticle (h/ruld) within the lower lip. As 

 compared with II. polita, the lip is more pouting, especially in fertile cells. 

 The mouth-spines are more numerous, usually eight ; small hinge denticles 

 are present, and the oral opening itself is horse-shoe shaped ; the upper 

 portion of the zooecium is semi-erect ; and the globose ooicium inclines back- 

 wards ; the surface of the zooecium is finely granular, but in dead specimens 

 looks smooth. There are usually no avicularia, but in a single case large 

 spatulate organs (fig. 7) are developed under very remarkable circumstances. 

 The zoarium is on a flat surface over the edge of which it makes its way 

 almost at a right angle. On the brow of the descent stand right outwards 

 four large spatulate avicularia. It would seem as if they had been developed 

 in order that they might investigate and report if it was safe that zooecia 

 should make their way over the precipice. They curiously reminded me of 

 what I had seen from my window a short time before, when beams of wood 

 were projected outwards from the parapet of the church tower, in order that 

 a platform might from them be suspended to enable the dial of the clock to 

 be gilded. There is a small peculiarity in the oral opening of H. polita 

 which distinguishes it from that of the present species ; at the corners of 

 the lower lip the surface of the zooecium is raised in a little fold (see my 

 original figures, Ann. & Mag. Nat. Hist. ser. 3, vol. xiii. pi. xi. fig. 1, and 

 Hincks, Brit. Marine Polyz. pi. xxxii. fig. 5). 



H. inultispinata is a deep-water form, dredged in about 70 fathoms. 



Phylactella labrosa (Busk). H., W. (PL 38. fig. 9.) 



1899. Phylactella labrosa, Waters, " Bryozoa from Madeira," Journ. Roy. Micr. Soc. p. 15, 



pi. 3. fig. 14. 

 1899, Phylactella punctigera, id. ibid. p. 15, pi. 3. fig, 13, 



I think that Mr. Waters is mistaken in supposing that two species have 

 been confused under the name P. labrosa. Busk's original figure represents 

 the ovicell imperforated and shows no oral denticle ; his type specimen came 

 from off Belfast. Now I have the species from the same locality, and it 

 would seem that the orocia are punctated in the younger state, but that the 

 punctures are closed up at a later stage, and occasionally the oral denticle 



