100 BULIMULUS-NAESIOTUS. 



to itself. In Dr. Baur's specimen, the nucleus is delicately trans- 

 versely ribbed, the vertex almost umbilicate, the earlier whorls 

 nearly white and opaque, pinched up into irregular little tubercles 

 at the suture ; the later whorls have revolving dark brown color 

 bands, separated by whitish interspaces covered with a yellowish 

 epidermis. The base is mostly pale, with a dark band around the 

 umbilicus. The outer lip is sharp-edged, and the umbilicus smalL 

 The pillar is short and straight. 



"A specimen sent by Cuming to Dr. Lea is not so large, and is 

 darker colored, the ground color being an olivaceous brown with a 

 narrow chestnut band at the periphery: the base pale and the um- 

 bilicus entirely closed. The nodulous band in front of the suture is 

 present and of a whitish color. 



" The name applied by Forbes was achatellinas, which, by several 

 authors, on the assumption that it was intended as a diminutive of 

 Achatinella, has been emended to achatinellinus, a most awkward 

 and clumsy word. But it is just as likely that he intended the word 

 as a diminutive of the same root as Achatina; and, at any rate, no 

 one has the right to make changes on an unsupported assumption, 

 for which reason the original form is retained here." 



B. NUX (Broderip). PI. 16, figs. 31-38. 



Shell umbilicate, ovate-conic, solid ; chestnut variously modified 

 by olivaceous, whitish or yellowish suffusion, paler on the spire, and 

 with a pale or yellow line below the suture, the apex either white or 

 purple. Surface somewhat shining, with rather strong growth- 

 wrinkles, decussated or cut into long beads by few or many spiral 

 incised lines. Spire conic. Whorls 7-7 J, slightly convex, separated 

 by well impressed sutures. Aperture squarish ovate, light within, 

 with a dark submargin ; outer lip somewhat straightened in the 

 middle, the columellar lip built forward and dilated ; columella 

 generally subtruncate below. 



Alt. 20, diam. 1H-12 ; alt. of aperture 9-9 mill. 



Galapagos Is.: Original typical nux of Broderip on bushes^ 

 Charles Island, in the upper wooded region ; mut. nuciformis, Chatham 

 Island (U. S. Fish Commission) ; mut. incrassatus, on the under side 

 of leaves hibernating, 1,600 feet above the sea, on the S.-W. end of 

 Chatham Island (Baur) ; mut. figured by Reeve in Conch. Icon., 

 abundant on Charles Island (U. S. Fish Commission) ; variety ver- 

 rucosus, Chatham Island; var. asperatus, Charles Island, abundant 

 (Wolf and U. S. Fish Commission). 



