LOWER CALIFORNIAN MOLLUSC A. I37 



stock from which some others of this group have branched 

 off, retaining some characters or acquiring others during 

 their migrations. Among these are some exactly like 

 Gould's B. vegeitis from La Paz, and also some like the 

 ''^pallidior'' form. At first I thought some of them were 

 B. excehiis Gld., and perhaps B. sph'ifer Gabb, with a 

 tooth visible in the aperture, but I could find no twisted 

 pillar nor flange inside. 



BuLiMULUS INSCENDENS W. G. B., and varieties. 



From El Taste Mountains Eisen sent about fifty normal 

 in form, seventy -four of var. bryanti and two of var. 

 beldingi. Among them is every variety of size and 

 smoothness, from a high polish to the roughness of 

 B. montezuma, without any connection between these 

 conditions; but Dr. Dall has named two more forms as 

 var. alta Dall and var. monticola Dall, both of which I 

 consider too unsettled to be of any value. Besides these, 

 he has rather confused the subject by admitting my var. 

 bryanti on p. 643, and then making some specimens which 

 have internal lamince a good species, on p. 645, under the 

 same name. 



BuLiMULUs ARTEMISIA W. G. Binney. 



This is one of the extremely aberrant species which 

 Dr. Dall tries to force into § Leptobyrsus on account of 

 " a faint elevated ridge far within the aperture." It 

 might better rest in Perona^us until the animal is examined 

 and compared with that of Columna. Dr. Eisen found 

 it most abundant in the El Taste Mountains, obtaining 

 about seventy between 3,400 and 4,200 feet elevation, but 

 only one was fresh and seemed to contain the animal, 

 though many had the curious epidermis unworn. This 

 is shown in pi. vi, fig. 5, X ^5 diameters, and the shell in 

 pi. V, fig. 13. The specimens are all of the size of Bin- 



