) I.-, 



several specimens of Paffuri in shells, and these >liell> were more 



destroyed than any I had before observed. One, a specimen of 

 Pergona tuierosa, urn only had the whole of the thickened rounded 



inner lip ; but the whole of the -epta between ihe whorl.- ii|> to the 



apex or the -hell were also destroyed, so a- to convert the -lull into 

 a simple conical cavity, and the greater part of the -ul>-tanee of the 

 outer lip was also removed from the inner surface, so as to render 



ihe outer part of the -hell very thin — indeed BO much W8J removed, 



that the series of pits on the outer surface, j 1 1 > t above the marginal 

 varix of the outer lip, were entirely destroyed, converting the pits 

 into a series of apertures ; and the other shells inhabited by these 

 Crustacea were similarly destroyed. The interna] surface of the 



shell has the appearance of being ground away by a file or other 

 roug-h surface. 



7. Remarks on the British Ac ti made, and Rb-arbangi 



Ml XT OF THE GENERA. By W. THOMPSON. 



Observations extending over many years, on the characters and the 

 habits of the British species of the Actiaxadce, clearly proved to me 

 that the genera of British Actinia required great alterations ; and I 

 submit the present classification as an improvement on those hitherto 

 used. 



It is well understood that the principal generic characters are de- 

 rived from modifications, and differences existing in the tegumental v 

 system and in the tentacula. Dr. Johnston, in his ' History of 

 British Zoophytes,' published in 1847, made but one British genus, 

 Art una of LinnsUS, and in this he included all known British spe- 

 cies; but he divided it into two sections or subgenera, the one cha- 

 racterized by having the skin smooth, the other by having the skin 

 covered with porous warts. Mr. Gns-e, in a paper read before the 

 Linnean Society in the early part of L855, divided the family into 

 three genera; namely, Sagartia, destitute of warts, and emitting 



filaments from pores ; BuNODKB, Btudded with wart-, and without 

 pores and filaments; and Actinia, having a perfectly smooth skin, 

 and destitute of wart-, pores or filaments. The character arising 

 from the presence or absence of filaments is not of very great weight, 

 inasmuch as the presence of filaments depends entirely on the pre- 

 sence of pores in the skin, and through which they are extruded ; 

 consequently, when there are no pores there are no filaments. 

 These genets comprised species possessing characten so different 



from each other, and BO well established, that I found they inii-t not 

 remain united. I'm - instance, the genus Sagartia included, am 



others, ./. diantkut, A. bettii and /. p • ritica ; but although the 



character- were u- DCllC di-linet: -hey appear to 



me to be of sufficient importance t. be osed as rs for the 



division of the Actinuute, and I have accordingly used them for thai 



purp 



Mo. CCH L^ I. — 1'k<m Bl DINGS or i ii r ZoOLOGN it So< tl u . 



