CELLARIA FISTULOSA. 109 



the aperture seems to be central or subcentral ; but cases 

 occur in which it is placed much nearer the top of the 

 area. It wants the raised and prominent lower lip of the 

 latter species. The avicularium, with its very shallow 

 arcuate mandible, directed upwards, is alone sufficient to 

 distinguish it from the other British forms. 



I have restored Linnaeus's specific name, on the simple 

 ground of its priority. Dr. Johnston summarily displaces 

 it for its " impropriety," and because the retention of it 

 would only tend " to the perpetuation of error." Of course, 

 we are well aware now that the branches are not tubular ; 

 but if we were to proceed to abolish all the names which 

 represent an error in theory or observation, we should 

 have our hands full, and should certainly inflict an injury 

 upon science, for which a more strictly correct nomen- 

 clature would be poor compensation. 



I have noticed two interesting monstrosities or irre- 

 gularities of development in this species : a doubling of 

 the avicularium, two of smaller size occupying the place 

 which is usually filled by one ; and ankylosis of the joint. 

 The latter has been observed by Busk in C. malvinensis, 

 and more frequently in the fossil species. 



CELLARIA SINUOSA, Hassall. 

 Plate XIII. figs. 5-8. 



FARCIMIA SIKCOSA, Hatsatt, Ann. N. H. vi. 172, pL TL figs. 1, 2. 



FARCIMLA SPATHULOSA, Hassall, ibid. xi. 112. 



SALICORXAKIA BIN UOSA, Johnst. B. Z. (2 ed.) i. 356, pi. Ixri. fig. 8 : Busk, 



Crag PoL 23 : Alder, North. & Durh, Cat, Trans. Tynes. F. 



Glob, iii. 152 (62 aep.). 

 SALICORSARIA FARCIMINOIDBI, Tar., Busk, B.M. Cat. pt i. 17: IMamoni, Bry. 



Fow. Ital. pt. IT. 4, pi. i. figs. 1, 2 *. 



* I have littledoubt that Manzoni's figures should be referred to this species, 

 and not to C.fittulosa. The position of the aperture in the upper part of 



