338 POLYZOA INFUNDIBULATA. 



says, " they most commonly amount to three or four, and very rarely 

 indeed to five ; but whether two, three or four, the same number 

 generally pervades the whole specimen." Ovarian capsules are to be 

 seen over some cells, but these are not common. 



Mr. W. Thompson has, in his collection, a specimen on an alga 

 from Van Diemen's Land : and it has been gathered at Gibraltar by 

 Dr. J. L. Drummond. 



Professor Reid has given a very complete description of the 

 animal. 



5. 0. HOOKEBI, " cells rounded, diverging, projecting.' 1 '' Sir 

 W. J. Hooker. 



PLATE LX. FIG. 1, 2. 

 Cellularia Hookeri, Flem. Brit. Anim. 539. 



Hob. " Found by Dr. Hooker at Torquay, 1812," Fleming. 

 Zetland, E. Forbes. 



" Height upwards of an inch, dichotomously branched, branches 

 straight, stiff, brittle, divaricate ; the cells are protuberant dorsally, 

 and their rounded top is nearly free, projecting laterally, giving the 

 edge a remarkably jagged outline, and the pearly ovaria are rounded." 

 Fleming. 



Polypidom erect, affixed by a fibrous base, frondose, dichotomously 

 divided, the segments narrow, linear, subcylindrical, striated or 

 ribbed on the inferior or outer surface, an appearance produced by 

 the root-fibres running up it. Cells opening on the upper or inner 

 aspect only, arranged in three rows, oval, adhering throughout, with 

 a moderately sized oval aperture, having a triangulate process on the 

 outside ; and from near the base of some of the cells there arises a 

 long setaceous bristle that bends over the upper surface of the poly- 

 pidom. This bristle is armed with a few spinules on its outer edge, 

 and is moveable. Ovarian capsules globular, smooth, pearly. 



Very like Cellularia neritina in habit, but more allied to C. scru- 

 posa and reptans. I have seen only one specimen, for which I am 

 indebted to Professor Edward Forbes. It is nearly an inch in height, 

 and of a brownish colour. 



* * * Apertures superior and very large. 



6. C. AVICULARIA, erect, dichotomous, the divisions rather 

 broad ; cells with a helmet-like figure over the opening, and two 

 spines on the top of each ; on the outward margin a bird?s-head 

 process. Ellis. 



