REPORT ON THE POLYZOA. 29 



The avicularia iu the Challenger specimens are numerous, and occur as described 

 by Hincks ; thei'e are a few ovicells, which cannot be called elongate, but short, de- 

 pressed. The ovicells open so far away from the oral aperture that it seems very pro- 

 blematical how the ova enter into the ovicell. The operculum has a prolongation at each 

 lower corner, fitting into the clefts below the oral aperture. These subopercular 

 appendages expand at the end, and become thicker both above and below, furnishing 

 strong supports for articular attachment. 



The form of the aperture is much the same as that described by Koschinsky in his 

 genus Rhagasostoma} 



Habitat. — Patagonia ; Falkland Islands. Fossil — Victoria (Australia). 



Hippothoa divaricata, Lamouroux. 



Uippothoa divarirata, Hincks, Brit. Mar. Polyzoa, p. 288, pi. xliv. figs. 1-4 ; pi. i. fig. 2 



which see for synonyms. 

 Hippothoa divaricata, Bask, Zool. ChalL Exp,, part xxx. p. 4. 



Specimens from washings from dredge between Fayal and Pico, 50 to 90 fathoms, 

 are sometimes in linear series, sometimes crowded, without showing any caudal prolonga- 

 tion ; surface granular, with the lower lip much raised, often forming an umbo, sometimes 

 with a peristome all round the aperture. The umbonate ovicell is not as wide as the 

 zocecium. 



This seems to most nearly correspond with var. ahstersa, Busk, from the Crag. 



Schizoporella tenuis, Busk. 



Schizoporella tenuis, Busk, ZooL Chall. Exp., part xxx. p. 165, pi. xx. fig. 10. 

 In the British Museum specimen from Simon's Bay there are large globose ovicells, 

 just the same as in Schizoporella nivea, and, unless there has been some mistake in 

 labelling, I am convinced that these two forms should be united under one name. 



Schizoporella poly morpha. Busk (PI. II. figs. 21-24). 



Qephyrophora polymorpha, Busk, Zool. Chall. Exp., part xxx. p. 167, pi. xxxiv. fig. 2. 



This does not seem to be the Schizoporella biturrita, Hincks {Schizoporella tuberosa, 

 Keuss), as both Mr. Hincks and I thought from the description. In the Challenger 

 specimens there is a concealed globular ovicell only attached at the ovicellular opening, 

 and situated above the operculum. The wall of this ovicell is thin, but calcareous, and 

 its form can be very well seen in prepared sections. Mr. Busk evidently refers to this 

 when speaking of two compartments into which he divides the cavity of the zocecium, 



' Bryozoenfaima der aelt. Tertiar des sud Bayerns, p. 29, Palseontographica, vol. .\.\xii. 



