REPORT ON THE POLYZOA. 15 



the genus will stand as at present defined, for the difference between this and Bifaxaria 

 IsBvis seems very great, while perhaps some of the species should be added to Urceolipora, 

 MacGillivray. 



Bifaxaria corrugata, Busk (PI. I. figs. 7, 8). 



Bifaxaria c07-nigata, Busk, Zool. Chall. Exp., part xxx. p. 80, pi. xiii. fig. 3 ; pi. xxiv. fig. 6. 



The avicularia, which are larger than indicated by Busk, belong to the zoarium above, 

 as may be distinctly seen when calcined, since the zooecia then separate, with the avicularia 

 remaining at the base. There are a few large pores on the surface of the zoarium. The 

 ovicells occur in the two opposite zooecia, and are formed by a swelling of the super- 

 jacent zooecia ; on the front of the ovicell there is near the upper part a small area 

 surrounded by a rim. 



Bifaxaria denticulata, Busk (PI. II. fig. 31). 



Bifaxaria denticulata, Busk, Zool. Chall. Exp., part xxx. p. 82, pi. xxiv. fig. 3. 



When a section is examined, a concealed ovicell just above the operculum is revealed. 

 Zoarium rooted by numerous chitinous tubes. 



Genus Cellaria. 



It would have been well if the name Cellaria had been dropped long ago, but it 

 seems that we should now consider it as established, seeing that it has been used by 

 Smitt, Hincks, and MacGillivray, and is, in fact, generally employed ; and, as pointed 

 out by Hincks, Cellaria fstulosa was made the type of Lamouroux. 



Mr. Busk, however, having used Salicornaria in his earlier works, seems to have 

 been unable to accept a change in his last. Jullien, in his recent paper, Bryozoaires, 

 Mission du Cap Horn, argues against using the name Salicornaria, but this seems like 

 slaying the slain, and instead proposes Melicerita of Milne-Edwards, a change with which 

 I am unable to agree. Dr. Pergens,^ on the other hand, unites with the genus Cellaria 

 the genus Tuhucellaria, but this differs entirely in the form of the aperture, also in the 

 last having a suboral pore, and to me the two genera seem widely separated. In an 

 earlier paper Dr. Pergens^ calls some fossils, apparently with Membraniporidan character, 

 Cellaria, but among others also cites Cellaria schreibersii, Rss., which however has a 

 SchizoporeUidan aperture. 



The peculiar shape of the aperture of Cellaria, fitting on to the one or two pairs of 

 teeth, seems to be a generic character of greatest value. 



1 Pliociine Bry. von. Rhodos, Ann. k. h. Nat. Hof. Mus., Bd. ii. p. 12, 1887. 



- Les Bryozoaires du Syst. Montien, par Meunier et Pergens, 1886 (see Cellaria Vandenbroeoki. pi. i. fig. 1). 



