THE NAUTILUS. 143 



rarely ; now they are never to be seen. They look like tortoise- 

 sliell or have very wide bands, but no more solid brown appear, al- 

 though I keep a sharp lookout. MRS. JOHN M. BROOKE. 



A NEW FORM OF PUPA. I 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 (i. e., arizonnisis W. G. Biun., not 

 Gabb.). On examining it more carefully than heretofore, it seems 

 to me at least a distinct variety, and it may be called P. r/abbiiva,r. 

 mexiccmorum. It is 3 mm. long, diam. lo 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. Ball's recent list of Central Region Pupidse may be added 

 Vertigo gotildi Biuney, which I found in a post-Tertiary deposit at 

 West Cliff, Colorado, along with a variety of V. orate. It has not 

 yet been found alive in that neighborhood. T. D. A. COCKERELL. 



VALLONIA PULCHELLA IN PITTSBURGH. 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. GEO. H. CLAPP. 



PUBLICATIONS RECEIVED. 



LIST OF THE CLAUSILI.E OF SOUTH AMERICA, WITH THE DE- 

 SCRIPTION OF A NEW SPECIES, by E. R. Sykes (Jour. Malac., V, 



