Mollusca of Great Britain. 313 
has been generally referred to this species, is rather a good 
representation of the L. pereger. Indeed the L. auricu- 
« larius has not been figured in either of that author's works ; 
and the only distinction made in the Historia Animalium 
Anglie between the two species is by designating the former 
** maxime.” 
3. ACUTUS. 
Animal virescenti-fuscum, punctis nigris et flavis minute 
sparsum. 
Testa elongato-ovata, ventricosa, glabra, subpellucida, ful- 
vescens, spira obliquá, acuminata. Anfractus4. Aper- 
tura ovata. | 
Long. 0.65.— Diam. 0.375. 
a. pellucidior, striis remotis transversis. 
Plentifully in a large pool on Crymlyn Burrows, unmixed 
with any of the other Limnei except L. truncatulus. Young 
shells are of a more elongated form than those of either the 
L. auricularius or L. pereger. It appears to be intermediate 
between the two last-named species ; and I hesitated at first, 
knowing the great variation to which this genus is subject, 
to separate it from the L. auricularius, to which it is closely 
allied through its variety: but, independently of the more 
oblique and less ampullaceous form, and of its being in- 
variably of a thicker consistency than that t shek the 4 cit- | 
g cumstance of the two species ver bei zethe 
"i me in my opi | y are not distinct, 
lam roeland: that ne: prea difference will be found to 
exist between any of the three species. | 
. It is admirably described and figured (Plate VII. fig.12.) — 
in 
