80 PROCEEDINGS OF THE ACADEMY OF [Feb., 



panied by both description and figure stands in preference to one 

 accompanied only by a diagnosis or only by a figure, the figure of 

 utahensis in the present case being either spurious or doubtful. 

 The page precedence recommendation (c) only applies when "other 

 things are equal." The name utahensis should be dropped and 

 gabbiana used (if at all) only as a ''form" name, not in a subspecific 

 sense. 



We revisited Sta. 15 and found one live example of the gabbiana 

 form, so it is possible that the colony may survive the destructive 

 fire of 1915, as a new growth of scrub oak is starting and will soon 

 furnish fair cover. 



Starting at Sta. 120, we found old, bleached shells of Oreohelix 

 haydeni oquirrhensis (Hemph.), robust and strongly ribbed spirally, 

 though the ribbing is somewhat variable. The ribs below the 

 sharply keeled periphery vary from four to seven and are usually 

 somewhat unequal in prominence or spacing or both. Above the 

 keel there are usually four ribs, sometimes only three. These shells 

 are very abundant among the charred stumps of scrub-oak thickets, 

 which had been recently burned, but were not found in the rock 

 slides. Persistent search up the gulch and across the low divide to 

 the south, failed to reveal a single live snail, though everywhere 

 "bones" were plentiful to the top of the divide. They are all much 

 weathered. Our impression is that the colony may have been 

 destroyed long ago, as this portion of the range has apparently been 

 swept by fires before, and is now barren for manj^ miles. Hemphill 

 found this form abundant alive somewhere near here over thirty 

 years ago. We found a number of bleached shells which we doubt- 

 fully assign to Succinea oregonensis Lea. They vary from grosvenori- 

 like to avara-like shells. The absence of color enhances the difficulty 

 of specific determination. 



Probably the colony of Sta. 120 crosses the divide well \ip the 

 mountain, and thus connects with Sta. 121, in the next ravine, where 

 the same subspecies of Oreohelix was found, all dead shells, some 

 nearly as coarsely ribbed as at Sta. 120, though the average examples 

 have much less conspicuous ribs, usually seven or eight below, 

 occasionally only four. 



At Sta. 122, on the west slope of the mountain, not in the gulch, 

 but only a short distance from 121, the few examples found, all dead 

 shells, are smaller, slightly flatter and smoother than at Sta. 121, 

 very near typical 0. h. gabbiana (Hemph.), but exhibiting a tendency 

 to grade into oquirrhensis. 



