THE NAUTILUS. 11 



The Ohio City specimens were abundant at 11,000 feet, just above 

 timber line, near a snow bank. That it was not a case of dwarfing 

 of specimens of cooperi on account of lack of moisture or low tem- 

 perature is indicated by the fact that 0. s. depressa at that and 

 higher altitudes seems at its best. 



Oreohelix hatdeni (Gabb). 



The only place in Colorado from which this species has been re- 

 ceived is Glenwood Springs, where it was found alive in such abund- 

 ance by Bethel and Dakan, and some fossil specimens collected near 

 there. I see no reason for Binney's conclusion that it is only a vari- 

 ety of strigosa. 



Oreohelix hatdeni gabbiana (Hemphill). 



In the Glenwood Springs colony hereinbefore described there is 

 some tendency to intergrade with haydeni, and the sculpture of the 

 embryonic whorls further indicates a close relationship. Dakan found 

 another astonishing colony near Newcastle, from which he brought 

 over 1,000 very fine adult specimens collected alive in a few moments. 

 I found them more sparingly at another point near there, on Lower 

 Mancos shales. Nine miles east of Meeker I found a colony on 

 Lower Mancos shales, where they were mingled with cooperi in about 

 equal proportions. It was raining, and the snails were crawling 

 about under the bushes by the hundreds. 



Oreohelix hendersoni Pilsbry. 



Known only from the type locality, where dead shells were col- 

 lected three years ago by Mr. A. Dakan, on Little Thompson Creek, 

 ten miles northwest of Longmont, on a talus slope of Niobrara lime- 

 stone. Dr. Pilsbry considered it new, so I asked Mr. Dakan to search 

 for live ones. Last July, during better snail weather, he returned to 

 the place and had no difficulty in getting 160 live ones and many 

 more dead ones. He says " it appears to be a small, healthy colony." 



NOTES ON SHELLS FROM ftUIEIGUA, GUATEMALA. 



BY HENRY A. PILSBRY. 



In the course of a recent visit to Guatemala, chiefly for studying 

 insects, Mrs. T. D. A. Cockerell collected the following snails, all 

 from Quirigua. 



