64 
THE -CONCHOLOGISES? 
EXCHANGE, 
broader posterior and a single bifid tooth (in- 
stead of two distinct ones) on the basal edge of | 
its peristome. 
I received the following forms—which ap- 
pear to’deserve a name as varieties—from Prof. 
J. H. Thomson, They are as the type from 
Santa Fe Canyon, New Mexico. I was in- 
formed the locality where they were found is 
now destroyed, being use as a “rancho”? for 
the cattle. 
Var. Zhomsoniana. Differt statura minore, 
numero anfractuum (51% nec 7), testa vix stria- 
tula, peristomate pierumque dilutiore, ultimo 
anfractu magis ad finem descendente et dente 
basali uno 72x bifido. 
Var. ovobena. Peratfinis preecedenti ; nume- 
ro anfractuum et statura persimilis; sed dis- 
crepat ultimo anfractu vix descendente ad ter- 
minationem, altiore; apertura majore et minus 
obliqua. 
3-—flelix armigera, Anc. 
I avail myself of the opportunity I have now 
of writing about some of the American snails, 
to declare I consider now as distinct the form 
I had formerly described under the name of H. 
Columbiana var (?) armigera (var. armigera, err 
typ., in “le Naturaliste’’). It was formerly 
refered by Mr. W. G. Binney (in Manual of | 
American Land Shells, 1885, p. 474) to Steno- 
trema germanum and thought by this concholo- 
gist to be a variety major of the last, connecting 
this species with Mesodon Columbianus. Sub- 
sequently (December, 1886) he figured this 
form as Mesodon armigerus and expressed his 
opinion that it would be doubtless considered 
eventually as a distinct species. It appears to 
me to be distinct from both shells, either Steno- 
trema germanum or Mesodon Columbianus 
that Mr. Binney regarded in his last work as 
more close to it than S. germanum. 
4.—Microphysa Ingersolli, Bland. 
Helix Ingersolli, Bland, in Ann. Lyc. N. H. 
N. York, xi, 151, fig. (1874): W. G. Binney, 
in Man. Am. Land Shells, 1885, -p. 170, ete. 
| 
Var. convexior, Anc. 
Testa paulo minor; spira haud planulata nec 
apice subimmersa, distincte convexa. Anfrac- 
tus modo 5 nec 5 %, regulariter sed minus lente , 
accrescentes. Umbilicus minor. 
Logan Canyon, Utah (Hemphill), 
This form differs very much from the type 
as figured by authors, and may perhaps in fu- 
ture prove to be a different species; if so, the 
name of cozvexiorv should be specific. 
5—Falula strigosa, Gould. 
Helix strigosa, Gould, in Proc. Bost. Soc. 
N. H,, ii, 166 (1846). 
Var. Bruneri, Ancey (Helix (Anguispira) 
Bruneri, Ancey in Le Naturaliste, 111, p. 468, 
1881). 
This shell (Bruneri) does not seem to me 
identical with the form Oquirrhensis, Hemphill 
MSS. (Binney in Bull. Comp. Zool., 1886, p. 
34, pl. Ul, fig. 12), as suggested by Mr. Binney 
himself. It is much more flattened and the 
umbilicus is wider. The spiral ribs are also 
more obsolete and interrupted. At any rate, 
my name, published in 18382, should have the 
priority on that of Oquirrhensis, a MSS. name, 
published only last year. 
A number of the forms Binney regards as 
mere varieties of Patula strigosa, I look on as dis- 
tinct species; such are: Wasatchensis, Haydeni, 
Oquirrhensis, Hemphilli, Bruneri, Utahensis, 
peripherica (Ancey 1882—multicostata, Hemp- 
hill MSS., Binney, 1886), castanea, Gouldi, 
etc. The limit between what are universally 
considered as distinct species at the present 
time, is quite impossible to determine, should 
all these shells be regarded as mere local vari- 
ations of a single species. In Europe H., stri- 
gosa should be the head of a very protean 
group of sfeczes. In the fact, most of the so- 
called varieties are confined to very restricted 
areas, which may eventually confirm the opin- 
jon I expressed here. 
To be Continued. 
