HELIX. 383 
Malakozoologie’ for 1845, has expressed his belief that it was 
a mere variety of Littorina Grenlandica. 
From the language of Linneus, and especially from the 
minuteness of the specified dimensions (for the seed of the 
Lithospermum officinale is at most the ninth of an inch long), 
there seems but little doubt that the H. pella was a member of 
the genus Rissoa, and probably a species not very unlike the 
eingillus (Mont. Test. Brit. pl. 12, f. 7) of our own shores, of 
which shell several examples are preserved in the typical col- 
lection. Their characteristics approach very closely to those 
required, and had not the preponderance of colour been attri- 
buted to the brown ‘“ fusca, fasciis flavis,’ whereas we should 
have expected “flavescens, fasciis fuscis’—a not very im- 
portant difference, considering the ordinary looseness of the 
Linnean descriptions—might reasonably have been regarded 
as the original types of the species, since they alone in the 
entire cabinet, and our author has recorded his possession of 
specimens, correspond in other respects with the language of 
the ‘Systema.’ I do not, however, claim the name for that 
shell, but simply infer the probability of its identity. 
Heltx pupa. 
So inadequately characterised was this species that it has 
been altogether omitted by Miiller and Chemnitz, and left, 
with only the original description attached to it, in the com- 
pilations of Schréter and Gmelin. Bruguieére, followed in this 
respect by Dillwyn, boldly ventured upon identifying it with 
a shell subsequently termed by Turton Bulimus tuberculatus 
(Zoolog. Journal, vol. ii. p. 363, pl. 13, f. 4); his opinion seems, 
likewise, to be partly countenanced by Menke in an elaborate 
paper on those Linnean Helices reputed to be indigenous to 
Barbary (Zeit. Malak. 1845). Although the ascribed contour 
“ ovato-oblonga” is utterly inapplicable to that shell, and the 
relative size of this species and the succeeding, which is said 
to be half as small again as the present, is diametrically 
opposed to such a conclusion (for the Bulimus tuberculatus is 
searcely larger than the Bul. acutus), I diligently, yet vainly, 
