JOURNAL OF CONCHOLOGY. 39 



NEW VARIETIES OF AMERICAN MOLLUSCA. 



By T. D. a. COCKERELL, F.Z.S., F.E.S., 



Curator of the Museum of the Institute of Jamaica. 



Helix Ihyroides var. nov. pulchella. Max. diam. 2o| mill , 

 thin, translucent, rather shiny, transverse grooves regular 

 and distinct, lip well formed but delicate, parietal tooth 

 subobsolete ; colour, pale horn, tinged with vinous, 

 especially near the aperture. 



This pretty variety was sent to me by Mr. D. B. 

 Cockerel!, who found it very common at Toronto, Canada. 

 It has somewhat the same relation to thyroides that gallo- 

 provinclalis has to cantiana. 



Pupa blandi forma nov. obtusa. 2\ mill, long, broader 

 in proportion to its length than the type. Near the 

 Micawber Mine, Custer County, Colorado. 



Pascal has described a somewhat similar form of 

 marginata proper {blandi being a subspecies or var. of 

 marginatd) as ohtusa. 



Succinea avara var. nov. compacta. A form with a 

 whitish shell, much incrusted with dirt, a large body-whorl, 

 and a very short spire, resembling in outline S. stretchiana, 

 with which it was formerly doubtfully identified. 



I found this variety by Chalk Creek, Chaffee County, 

 Colorado. It requires further investigation and may prove 

 a new species. It certainly is not allied to stretchiana, but 

 belongs with avara. 



Succinea lineata forma nov. elongata. Length 13, aperture 

 length 7, spire length 6 mill. Kremmling, Colorado. The 

 ordinary form, also from Kremmling, measures 11 mill, 

 long, aperture 7, spire 4 mill. long. 



