212 NORxMAN^ ON RARE BRITISH POLYZOA. 



the chalk, and I am glad to have been enabled to verify Mr. 

 Sorby's statements m every particular. The chalk contains 

 cyatholiths and discoliths identical with those of the Atlantic 

 soundings, except that they have a more dense look and 

 coarser contours (figs. 3 and 5) . In fact, I suspect that they 

 are fossilized, and are more completely impregnated with 

 carbonate of lime than the recent coccoliths. 



I have once met with a coccosphere in the chalk ; and, on 

 the other hand, in one specimen of the Atlantic soundings 

 I met with a disc Avith a central cross, just like the body 

 from the chalk figured by Mr. Sorby (fig. 8). 



Notes on some Rare British Polyzoa, with Descriptions 

 of New Species. By the Rev. Alfred Merle 

 Norman, M.A. 



The object of the following paper is to embrace a few 

 notes upon some of the rarer of the British Polyzoa, and 

 to describe several species new to science. 



Brettia pellucida, Dyster. 



Brettia pellucida, Dyster. Quart. Jour. Mic. Sc, N. S., 

 vol. vi (1858), p. 260, pi. xxi, figs. 3—5. 



This species is omitted in the ' Catalogue of the British 

 Marine Invertebrate Fauna ' published by the British Asso- 

 ciation. The type specimens were found at Tenby. In 

 1865 I procured some small fragments when dredging with 

 my friend Mr. Jeffieys in the Minch. 



Brettia pellucida seems to be congeneric with Alysidium 

 Lafontii, Busk; but that species can hardly belong to the 

 same genus as Alysidium parasiticum, Bvisk. I Avould pro- 

 pose, therefore, to leave the latter as the type of the genus 

 Alysidium, and to remove A. Lafontii to the genus Brettia. 



ScRUPARiA clavata, Hincks. 



Scruparia clavata, Hincks. Quart. Jour. Mic. Sci., N. S., 

 vol. v (1857), p. 175, pi. xvii, figs. 

 5—8. 



Huxley a fragilis, Dyster. Quart. Jour. Mic. Sci., N. S., 



vol. vi (1858), p. 260, pi. xxi, figs. 1, 2. 



There cannot be, I think, any doubt as to the identity of 



