138 CALIFORNIA ACADEMY OF SCIENCES. 



ney's U-pe, but the epidermis is not pale yellow, but 

 chestnut-brown when fresh. This has also a beaded ap- 

 pearance, as shown enlarged in the figure. The little 

 tubercles formed about 27 revolving rows on the body- 

 wiiorl and 8 to 18 rows on the others, except the two 

 nuclear, which have the usual vertical riblets. There 

 appeared to be deciduous flakes of epidermis on the 

 granulations before brushing them off. Inside of mouth 

 when fresh, brown and shining, and some had a divergent 

 mouth, as in B . iiiscoidciis brxaiiti . In most of them the 

 lips are connected bv a continuous callus, and in some it 

 is raised, as in CoI/iiniKi niiiiciilo^a, but less everted and 

 thickened, as well as more oval in form. 



Three were found near Cape St. Lucas, which measure 

 0.S6 to I inch long and 0.24 to 0.30 wide. Two of them 

 are half bleached, but with some traces of epidermis on 

 them, as well as sculpture. 



In form and epidermis there is thus a remarkable re- 

 semblance between this shell and CoIuduhi ramentosa, es- 

 pecially to the subspecies abbrcviata, as is shown on 

 comparing lig. 17 with llg. 18 (which is magnified twice), 

 as well as in figs. 30 and 31. From these facts a genetic 

 connection in the tertiary epochs can liardly be doubted, 

 although their generic characters have since widely 

 diverged. 



BuLiMULUs XANTusi W. G. Binney (B. gabbi C. & F.) 

 The opinion I advanced as to the identity of these two 

 forms is confirmed bv Dr. Dall from comparing Binney's 

 type with the description and figure of Crosse & Fischer. 

 As further proof, Dr. Eisen collected forty specimens on 

 the El Taste Mountains, which present characters chiefly 

 of Binney's type, but also some with variations like 

 ''B. gabbi"" and those of the more eastern forms which 

 I referred to B. xantiisi. Dall has sriven the name of 



