in Dr Flemhig's Work on British Animals. 77 



a very strong alliaceous smell, in one it was faint, and in the 

 other it was not perceptible. It would appear, therefore, that 

 the animal has the power of retaining or emitting its peculiar 

 odour at pleasure ; and that, in death, its emission may be pre- 

 vented by accidental circumstances. I could not satisfactorily 

 ascertain its source ; but it appeared to arise from a yellowish 

 fluid pressed out from above the head. I cannot so unhesitating- 

 ly assent with Dr Fleming, in considering the H. caperata of 

 Montagu as synonymous with the H. striata of Draparnaud. 

 The latter is the most common of all shells in the vicinity of 

 Berwick, and the white rib within the outer lip is a constant 

 character. Now, Montagu takes no notice of this in his descrip- 

 tion ; and we all know how minute his descriptions are ; while 

 Dr Turton expressly states, that the H. caperata is to be dis- 

 tinguished from H. virgata^ " in wanting the thread-hke rib 

 round the inside of the lip." Moreover, the figure of Montagu 

 is not at all like to the H. striata. 



Though the construction of the genera of the remaining land 

 and aquatic Pidmonifera might afford occasion for remark, we 

 shall now pass on to the naked Brancldfera. In Tritonia, we 

 observe, that the T. coronata which is a native of the Frith 

 of Forth, was not known to the Doctor ; and the two species 

 which follow do not appear to have been yet described. 



1. Tritonia plebeia. 



Body oval, narrowed behind, greyish ; superior tentacula multipartite, cylin- 

 drical ; branchiae uniserial, dendroidal. 

 Hab. — The sea near Berwick. 



Desc. — Body one inch long, 4 lines broad, truncate before, tapered to a nar- 

 row point behind, limacifonn, greyish,' irregularly speckled and blotched with 

 brown. Back slightly convex ; sides abruptly flattened with the markings of a 

 deeper colour; foot white. The anterior margin of the cloak, above the 

 mouth, is cut into 6 or 7 short conical filaments, partly retractile. A little be- 

 hind are the two short cylindrical sheaths from which the tentacula issue. 

 These consist of a fascicle of filaments united at the base; and arranged appa- 

 rently round a central pillar of whiter colour ; and are only displayed when 

 the animal is active and in motion. Along the margins of the back 

 there are 5 or C branchial processes, gradually decreasing towards the tail, and 

 having an apt similitude to an old and leafless tree in miniature. 



