ME. A. W. WATERS ON MEMBBANIPOEIDiE. 681 



Busk, and then M. arctica can remain for Semiflustrellaria 

 xirctica, d'Orb. and Smitt, although, the name at first was only 

 manuscript, 



Membeakipoea calieoeniensis, sp. nov. (PI. 49. fig. 14.) 



The oval zooecia are closely united together, and the border, 

 which is not very thick, is armed with, a stout articulated spine 

 on one or both sides somewhat above the middle ; below, there are 

 on eacli side usually two delicate pointed spines. 



Below the zooecium there is a long triangular avicularium often 

 curved to the border of the zooecium ; sometimes this is replaced 

 by a short triangular avicularium. The operculum has a flap 

 somewhat like that of M. Mans, H., and the ovicell has a thick 

 rib. Having only seen the one specimen from California, sent 

 by Miss Jelly, I have been unable to prepare out the operculum 

 or make any dissectioos. 



Perhaps this should be called a variety of M.. Sojjhice. 



Loc. California {Miss Jelly). 



Membeakipoea inteemedia, Kirkpatrick. 



Membranipora radicifera, var. intermedia, Kirkjpatrick, Proc. R. Dublin 

 Soc. n. s. vol. vi. p. 615, pi. xvi. figs. 1, 2. 



Membranipora intermedia, MaeGiUivray, Tert. Polyzoa of Victoria, 

 p. 34, pi. iv. fig. 8. 



Tremopora dendracantlia, Ortmann, Die Japanische Bryozoenfauna, 

 p. 29, pi. ii. fig. 6. 



It is very possible that this is the M. cervicornis of Haswell 

 {M. Saswellii, Hincks). 



Membeanipoea bidens {Sag.). (PI. 49. fig. 1.) 



Cellepora bidens, Hagenoio, Bry. Maastr. Kreideb. p. 92, pi. xi. fig. 16. 



Cellepora hippocrepis, JReuss, nee Goldfuss, Foss. Polyp. Wien. Tert, 

 p. 94, pi. xi. fig. 14. 



Membranipora bidens, Busk, Crag. Polyzoa, p. 34, pi. ii. fig. 44 ; ReusSi 

 Bry. Oest- Tiny. Mioc. p. 183 (43) pi. x. figs. 10, 11 ; Manzoni, Brioz. Plioc 

 di Castrocaro, p. 15, pi. ii. fig. 16 ; Waters, " Bry. Plioc. of Bruccoli,' 

 Trans. Manch. Geol. Soc. vol. xiv. p. 467. 



Micropora hippocrepis, Waters, " Foss. Chil. Bry. from Mt. Gambier, 

 .8. Australia,'^ Q. J. Geol. Soc. vol. xxxviii. p. 264. 



Periteicbisma bidens, Koschinsky, " Bry. Tert. Bayerns,^^ PalcBonto- 

 grapTiica, vol. xxxii. p. 27 ; Pergens, ^' Plioc. Bry. von RhodosfAmu Natur- 

 hist. Hof museums, Wien, vol. ii. p. 17. 



As I have elsewhere said, in the specimens dredged oft' Capri 

 the opercula and other organic parts have disappeared, and thus 

 it has been impossible to study the position of the operculum : 



