0; 



ouo 



ance as that fhcll, and when recent, has a tinge of red, 

 from the colour of the animal, which is fcarlet. 



From being a heterojlrophe fliell, it might be more 

 readily confounded for 5. lucida, but is double the fize, 

 not fo pellucid, and is broader at the bafe ; this, too, is 

 principally found on cruftaceous animals ; the other is 

 peculiar to Sei'tularia, efpecially 5. abietina ; and nei- 

 ther is found in any one inftance, to inhabit the place of 

 the other. 



Mr. Walker has figured two, which we confider as 

 only this flTell in different flages of growth ; he defcribes 

 them as differing only in the number of fpires, one hav- 

 ing four, the other two; the lafl: of which he exprefs- 

 ly fays, is found on lobjlers. Both are figured as reverfed 

 fpecies, a circumllance omitted in the defcription, but 

 fufhcient to confirm our opinion, efpecially, as we have 

 never obferved this fl:iell attached to any thing on our 

 coafls but the common Lobjler, Cancer Gammarus, and 

 fpiny lobjler, C. Hoviarus, taken on the fouth coafl of 

 Devon* It does not conffantly occur on thofe animals, 

 but is fometimes thickly cluftered together on various 

 parts of the fame fubjeft. 



9. 

 S. with a very fmall, fpiral fliell, of a dirty-\\'hite co-Minuta, 

 lour, with two or three lateral volutions, wrinkled tranf- 



T t t verfely : 



* On the Guernfey coaft is fometimes found to inhabit Haliotis tubcrculaU. 



