378 MOLLUSKS OF THE CAT.Al'AGOS — STEARNS. 



but a liy,uio of what in coiniiioii pailaiUH' is called a '-liiun- specimen" 

 than tlie individual that was lirst described. U will at once be per- 

 ceived that this i)iactice must often lead to confusion. There are also 

 discrepancies between the text and the numbering- of the figures of 

 the Galapagos lUiliini. 



Keeve's ligiue "121 cscltarij'cnis"' represents ri((/i<I(>siis, and his "135 

 JacoW'' probably applies to a baudless variety of unifasciatus. 



To resume the consideration of the specifu* and varietal se(picnce 

 and rclationshii) of uux, as referred to and ligured by authors, in 

 comparison with the material before me, we have tirst — 



Buliniuliis mix Urod., Sliy. Concli. 111., Iii;.s. :!7 and 37^. 



* 



Typical, numerous examples (IMus. Xo. 1185()S), Charles Island. 



Color puri)lish-black or dark reddish-iuirple; apex dark; the follow- 

 ing one or two whorls light colored, or whitish; tigure 37 shows incon- 

 spicuous dark bands on the l)ody whorl. In a large number of speci- 

 mens it will be seen that these run gradually into ashen gray, and 

 again into pale ashen-blue. 



B. nux, Itaiulcd variety^ B. xistulatiis Koove iion Sby. 



Four exami»les (iMus. No. 1185(11)). 



Vide Keeve's lAIonog. Uulimus, Condi. Icon., lig. 130, not Sowerby's 

 Conch. Ills., fig. 42. lleibisch's tigure 5, of " ustulatus Sby.," represents 

 banded example oH nux; it is intermediate in form between the above 

 specimens (No. 118509), and the slenderer form to which Sowerby 

 gave the name. 



B. iiux, variety with iiitercised sculpture. 



Charles Island; numerous (Mus. No. 118570). 



Purplish-brown to rufous-white; surface sculptured by revolving^ 

 incised lines. Mr. W. G. Dinncy's ''Arioiita intcrcisa, a species of 

 the California region, from San Clemente Island and Santa Cruz 

 Island," in the Santa liarbara channel and Br. Newcomb's " J-. Ayre- 

 sioiKi," another island species IVom t he same region oc(airring" on Santa 

 Cruz, San Miguel and Santa Ilosa islands, are pertinent illustrations 

 of the sculpture exhibited by the above variety of uux 



I have before called attention to the relationship of the character of 

 sculpture abo\e mentioned to the environment. It will be observed 

 that it is present in a greater or less degree in forms that inhabit 

 saline, arid, sandy and wind swept stations. The Bulimi of the Gulf 

 of California region, oi' the pal lid ior, rnjetus, Xuufuxi group, exhibit it 

 frequently; I hare in mind //. jxdUdior from Carmen Island in the 



