14 THE NAUTILUS. 



firmation. Mr. Cossart's collection from Bugio (1921) con- 

 sists of the following forms : 



Plebecula vulgata saxipotens (Woll.). Six. 



P. punctulata avellana (Lowe). Common. 



Oeomitra micromphala (Lowe). Six. 



G. polynwrpha poromphala (Lowe). The most abundant 

 shell. 



G. coronula (Lowe). Two examples of this beautiful little 

 species. 



G. actinophora descendens (Woll.). This form can only be 

 segregated 011 average characters, I think. Three were found. 



OBEOHELIX MACULATA, NEW SPECIES. 



BY JUNIUS HENDERSON. 



In 1917 I collected several species of Oreohelix in abun- 

 dance in Shell Creek Canyon and White Creek Canyon, 

 northern Wyoming. The first-mentioned canyon is the type 

 locality of 0. pygmaea Pilsbry, and the other, near by, is the 

 only other recorded locality for that species. Supposing that 

 I was at the type locality of pygmaea, and misled by the size 

 and shape of the smallest species of Oreohelix I found there, 

 the specimens were labeled pygmaea in the field and so desig- 

 nated in the field notes. Apparently they were not re- 

 examined upon returning to Boulder, but were unfortunately 

 placed in a drawer and published as pygmaea (NAUTILUS, 

 XXVII, pp. 45-46), and specimens have since been distrib- 

 uted in exchange to several conchologists and institutions 

 under that name. A few days ago I examined a few of them 

 with a lens, just after looking at some true pygmaea, and at 

 once saw that they bear no very close resemblance to that 

 form or to any other described Oreohelix. Indeed, the differ- 

 ence may be readily seen without a lens. An examination of 

 the records in comparison with the latest map of the region 

 also shows that the pygmaea localities are several miles far- 

 ther up both canyons than our 1917 stations, and none of the 

 material found in 1917 is pygmaea. 



