212 CALIFORNIA ACADEMY OF SCIENCES. 



nothin<j more, but is sometimes found even larijer in thick 

 callous-mouthed examples of B. -pallidior, B. inscendens, 

 and B . -protcus, differing in form. As stated by Binne}^ 

 the jaw has the characters of a very different famil}- from 

 Bnh'iuus, so we may still include the shell among its ex- 

 ternally similar neighbors. In this only, no trace of the 

 vertical riblets is seen on the nuclear whorls, but they 

 may be eroded. 



B. suFFLATUs Gould, 1853. Mr. Eisen sent 38 from 

 Sierra Laguna. not different from t^'pe, the largest being 

 1.35 inch long and i.io wide. The young has a very 

 thin yellowish epidermis, which peels off when adult, be- 

 coming pale brown. A specimen sent from La Paz by 

 Mr, Belding has ver}- narrow \ertical brown stripes on 

 three large whorls, 12 on the lower one, caused by epi- 

 dermis beinij cauirht between some of the lines of (Growth, 

 a not uncommon event, giving the same coloration seen 

 in B. -proteus. The upper two whorls, when not much 

 worn, show the same riblets as in B. inscendcns, etc. 

 The many specimens of this and of B . pihtla obtained do 

 not settle the question as to their identity, as none of the 

 latter contain the animal. In the specimens of both from 

 near San Jose del Cabo, the young of snJfJaliis differ from 

 B. -piliila of the same size onlj^ in having the umbilicus 

 quite closed ; but both forms vary in this character, and 

 the following variety certainly connects them : 



Var. iNSULARis J. G. Cooper. Found only by Mr. 

 Bryant on one point of Espiritu Santo Island, where he 

 got six dead chalky specimens, apparently fossil, though 

 only seen on top of the ground. Compared to Gould's 

 t^T^pe they are not so swollen (while others we have are 

 much more so), but they closely resemble some from 

 toward La Paz in form, being more narrowly ovate, but 

 smaller. A half-grown one is as thin as many of them, 



