THE NAUTILUS. 143 
rarely ; now they are never to be seen. They look like tortoise- 
shell or have very wide bands, but no more solid brown appear, al- 
though I keep a sharp lookout.—Mrs. Jonn M. Brooke. 
A New Form or Pupa.—lI find, occasionally, in the rejecta- 
menta of the Rio Grande at Mesilla, N. M., a Pupa which has been 
considered to be P. gabbii Dall (1. e., arizonensis W. G. Binn., not 
Gabb.). On examining it more carefully than heretofore, it seems 
to me at least a distinct variety, and it may be called P. gabbii var. 
mexicanorum. It is 33 mm. long, diam. 13 mm., white, delicately 
but distinctly ribbed, the ribs filiform, four of them entering the 
parietal wall of the aperture. The aperture is rather narrow, with 
the outer margin somewhat flattened, and inclined to be elbowed 
above. The peristome is quite thick. Besides having the well- 
marked ribs, this is smaller and narrower than the typical gabbii. 
I found, however, an equally small form of gabbii in Colorado, on 
Round Mountain near Silver Cliff. 
To Dr. Dall’s recent list of Central Region Pupide may be added 
Vertigo gouldi Binney, which I found in a post-Tertiary deposit at 
West Cliff, Colorado, along with a variety of V. ovata. It has not 
yet been found alive in that neighborhood.—T. D. A. CocKERELL. 
VALLONIA PULCHELLA IN PirTsBURGH.—A couple of months 
ago a friend sent me a lot of Vallonia pulchella that he had col- 
lected on his front walk in the East End, Pittsburgh. He says that 
he first noticed them late last spring or early summer, but is not 
sure of the date now. He says that they suddenly appeared after a 
rain literally in millions, and about three weeks later they again 
appeared, but in smaller numbers. ‘The first time they appeared he 
says he gathered up a half tumbler of the shells for me but lost 
them. On their second appearance he got about a thousand which 
he turned over to me, and I send you a few under separate cover to 
let you see that they show the effect of Pittsburgh smoke. 
My friend is going to watch for them this spring and summer, 
and if they appear will make a note of the date and how long they 
stay. There is a stone wall around the place and he thinks they 
come from this wall—Gro. H. CLapp. 
PUBLICATIONS RECEIVED. 
LisT OF THE CLAUSILIZ OF SouTH AMERICA, WITH THE DeE- 
SCRIPTION OF A New Species, by E. R. Sykes (Jour. Malac., V, 
