JOURNAL OF CONCHOLOGY. 65 



Summit, Garfield, Mesa, and Delta Cos. Patida cooperi 

 is perhaps more abundant than in any other district, and 

 P. striatella occurs freely — its white variety was found near 

 the Mam Mountains, Mesa Co. Microphysa ingersollii 

 occurs on the Grand Mesa, at over 9,000 feet, and from 

 Surface Creek, Delta Co., I obtained Pupa blandi Morse, 

 P. corpulenta Morse, and a species referred by Mr. Pilsbry 

 to P. roweUii Newc. Physa heterostropha abounds in the 

 Gunnison River, and P. elUptica Lea has its only known 

 Colorado station in Gunnison Co. Ancylus fragilis Tryon 

 was found on boulders in Buzzard Creek, and Sphcerhim 

 occidentak Prime occured in a pond near Black Lake — 

 both these species are additions to the Colorado list. A 

 small Pisidium, having apparently somewhat the same 

 relation to P. pusillum that P. roseum has to P. Jiitidiim, 

 is provisionally called P. mesa'. It is from the southern 

 slope of the Grand Mesa, in Delta Co. ; it may prove to 

 be but a variety of P. pusiUum. 



IVhite. — No records are at present forthcoming. 



Bear. — Records entirely wanting. 



Palaeontology. — The fossil mollusca have been dealt 

 with by White and others at some length. Species of Ostrea, 

 Phiirotomaria, Inoceraffius, Pj'oducti/s, Rhy7ichoneUa^ Tere- 

 bratula, &c., &c., have been discovered. I have an undeter- 

 minable fragment of Ammorutes from Pueblo Co. 



Helix nemoralis m. sinistrorsum in Middlesex. — I 

 took a specimen of this variety while collecting shells last 

 September, on the railway bank at West Drayton, Middlesex. 

 It is a dead shell but in fairly good condition.— F. G. Fenn, 

 Syon Lodge, Isleworth, October, 18S8, 



