1917.] NATURAL SCIENCES OF PHILADELPHIA. 67 



well developed as seen under a lens, but much less pronounced than; 

 in gabbiana from Oquirrh Mountains, though many specimens are 

 more angular than typical hijhrida from Logan. 



The material of these three stations taken as a whole seems to be 

 clearly hyhrida, and the variation within such short distances is 

 characteristic of the various subspecies of haydeni wherever we have 

 found small colonies of them not far apart, as at Devil's Slide and 

 Oquirrh ^Mountain, Utah, and at Glenwood Springs, Colorado. 



Ogden, Utah. 



Sta. 105, mouth of Ogden Canyon. Oreohelix strigosa depressa 

 (CklL), dead shells about the granite and quartzite slides for a mile 

 up the canyon on both sides. Live examples were found by a 

 moment's search at several points, particularly abundant under a 

 large mat of Clematis on one quartzite slide. Bleached shells also 

 extend along the west slope of the mountains to a gulch about a mile 

 to the north, as far as we went. Brush fires swept the mountains 

 some years ago, so the vegetative cover is now very poor and erosion 

 is rapidly stripping the steep slopes. Binney^^ recorded Pupilla 

 Uandi (Morse) from Ogden and Vertigo corpulenta (Morse) from 

 Ogden Canyon. Probably the latter record should be referred to 

 V. modesta parietalis (Ancey),^^ of which Ogden Canyon is the type 

 locality. Binney's material recorded as corpulenta was collected 

 by Hemphill, and the fact that other material described by Ancey 

 at about this time was received by him from the same collector 

 makes the supposition that his parietalis was obtained by Hemphill 

 reasonable, and hence probably Binney's and Ancey's records are 

 not only from the same canyon, but from the same lot of material. 



Sta. 106, a small, sluggish stream on south side of valle}', about 

 a mile below the mouth of Ogden Canyon: 



Fluminicola fusca (Hald.). Physa crandalli Baker ? 



Lymncea traskii Tryon. 



Oreohelix peripherica wasatchensis (Hemph.). 



Sta. 108, base of river terrace, south and southeast of Sta. 106, 



alluvium, enclosing fragments of limestone. Dead shells abundant, 



about 25 live examples found in a scrub oak and mountain-maple 



thicket. At this station the shells vary greatly in form, many being 



not distinctly carinated and much flatter and smoother than typical 



wasatchensis, thus forming an intergrading series between t^^pical 



" 2d Suppl. to 5th vol. Terr. Moll, p. 40. 



18 The Conchologists' Exchange, vol. II, p. 80, 1887. 



