460 PELORIDZ. 
of that muricidal animal, the mechanism of Janthina will be 
better appreciated by comparison. Therefore, after M. Cu- 
vier’s particular and minute account, that the proboscis im this 
species is a great and inflated, though short muzzle, which can 
be retracted within the buccal sheath, we must bow to such 
high authority ; but independently of this fact, there are other 
characters which sufficiently declare that this extraordinary 
animal can have no other allocation than in the vicinity of the 
Muricide. 
This is the only species I have had an opportunity of exa- 
amining ; one or two other rarer ones are sometimes found 
in company with it, as the Janthina exigua and I. pallida; 
the last I think is only a variety of the present species. 
These animals have no operculum. 
The following has not occurred to me alive :— 
I. exteua, Lamarck. 
I. exigua, Brit. Moll. ii. p. 555, pl. 69. f.8, 9. 
SCALARIA, Lamarck. 
This genus contains several British species. Authors and 
Lamarck’s commentators say, that it is allied to Turritella, 
but I think that it has much greater affinity with the Canali- 
fera. Turritella and Scalaria, im addition to the smgle bran- 
chial plume, appear to have the mucous strands of the Muricide, 
which are always provided with that appendage, besides the 
gland of viscosity. In other points, Twrritella, by its short, 
produced muzzle, circular operculum, and the absence of a 
proboscis, comes nearer to the Littorine and Trochi, whilst 
Scalaria, with the mucous fillets, has also the decided pro- 
boscis of the Canalifera; consequently it must be assigned, 
as a muricidal anomaly, to the new family of the Peloride. 
However, whatever may be the affinities of the two genera, 
they will not be far apart; the one claiming, by its slightly 
developed canal, both of shell and mantle, to take position on 
the confines of the Holostomata, the other on those of the 
Canalifera. An attentive perusal of the account of the under- 
mentioned species will show that the Scalarie are truly strange 
