HALIOTIS. 107 



The whole shell is traversed by spiral cords, nearly regular, al- 

 most equal in size, and covered with very numerous close lamella?, 

 part erect, part scale-like, looking like threads spun over it. The 

 lira? are separated by deeply cut furrows, showing growth-lines, and 

 in old examples an interstitial thread is developed on the part near- 

 est the outer lip. There are besides, in the neighborhood of the 

 apex, irregular longitudinal folds, and on the rest of the surface a 

 few indistinct ridges indicating periods of growth. The carina has 

 in three specimens 6, in one 7 open perforations. The portion be- 

 tween the row of holes and the columella slopes obliquely with very 

 slight indication of a depression. The younger examples are olive- 

 yellow or grayish-reddish, with blood-red flecks, and the earlier 

 half of the older ones is the same, but somewhat darker ; the latter 

 portion of the surface marked with a few brownish-red and green 

 streaks. The columellar plate is bordered outside by a narrow 

 brownish-red edge. The inside of the shell is marked by narrow 

 spiral and broader longitudinal depressions, corresponding to those 

 of the outer surface, the longitudinals being more conspicuous within 

 than outside. The nacre is white, with red and green reflections. 

 {Lischke.) 



Length 61, width 42 mill. 



Nagasaki, Japan. 



H. supertexta Lischke, Japanische Meeres-Conchylien 2ter Theil, 

 p. 92, t. 6, f. 13, 14, 15 ; Mai. Bl. xvii, p. 24 (July, 1870).— Wein- 

 kauff, Conchyl. Cab., p. 42, t. 16, f. 7, 8. 



Distinguished by the sculpture of close, elevated lamella? of growth 

 over spiral lira?. The form belongs to the circle of diversicolor 

 Tayloriana, Japonica and Gruneri — a group, the Japanese species 

 of which need thorough revision by someone having more material 

 than any of the authors who have yet written on Hallotis, the 

 variations of sculpture being peculiarly perplexing. 



H. viRGiNEA Chemnitz. PI. 47, figs. 9, 10 ; pi. 17, figs. 94, 95, 96 ; 



pi. 18, figs. 3, 4 ; pi. 6, fig. 34. 



Shell oblong-oval, very convex; spire almost terminal; spirally 

 lirate, having a few radiating wrinkles, sometimes obsolete ; perfora- 

 tions small, oval or rounded, about 7 in number. 



The outline is oval, right and left sides equally curved, widest at 

 about the middle ; back very convex, not carinated at the row of 

 holes, but having a very shallow excavation just below it. Color 



