13° 
I, nevertheless, think it should be particularly noticed ; for, 
the more accurately such peculiarities are detailed, the 
greater degree of comparison is afforded, for correctly ascer- 
taining the limits of species. 
5 P Jah. FR, ve Light , 
( BULIMUS VIRESCENS) 
( eye: citrinus, var. Sor & Be | 
(Lot 1003.) 
B. testd ob-ovatd viridi-flavescente ; spire conice, vix tncrassata, 
obtuse, anfractibus in suturas depressis plerumque perversis ; labio 
interzore antice obsoleto ; umbilico aperto, 
Shell obovate, green, variegated with yellow; spire conic, slightly 
thickened, obtuse; the volutions depressed on the suture, 
and, generally, reversed; inner lip obsolete; umbilicus open. 
THE same uncertainty exists with regard to this shell, as 
the last, viz. whether it should be considered as a variety, 
or as a distinct species, from B. citrinus, (Zool. Ill. pl. 42.) 
I have seen many specimens, but not one where the inner 
lip was developed on the upper part, that is, between the 
umbilicus and the top of the outer lip. If this character be. 
found constant, it should, I conceive, be taken as a good 
and sound specific distinction ; and more than one writer has- 
made it, in other instances, of generic importance. In the 
two varieties of Bulimus citrinus (here figured from this 
collection), and in numerous others which ! have inspected, 
the inner lip is entire, much thickened, and dilated over the 
umbilicus, which is thus hid in mature age. | 
: fj 
Hak, ANSR Qn , Motu cir 
