226 GIBBULA. 



this species does. The figure of iridescens, copied on my plate, is 

 more elevated than most fulgens I have seen. 



G. LACAZEi A^elain. PI. 66, figs. 7, 8. 



Shell slightly elevated, sul)circular, narrowly iimbilicated ; rather 

 thick, with a very thin epidermis ; aperture oblique, nacreous inside ; 

 operculum corneous, many whorled ; spire composed of 5 whorls, 

 rapidly increasing, presenting (1) a flattened, slightly convex part 

 beneath ; (2) longitudinal [i.e. spiral] ridges, quite strong, unequal, 

 with 2 or 3 interstitial, secondary, feeble ridges ; (3) transverse 

 fincremental] stride, very fine, regular, close, crossing the other 

 ridges. Aperture oblique, subcircular, nacreous inside ; umbilicus 

 small, and often hidden by the extension of the columellar lip. 

 Color a whitish-gray, with rosy and green reflections. Some of the 

 principal ridges are visibly tinged with pale rose. 



Alt. 54, diam. 7 mill. {Vclain.) 



Island of St. Paul, Indian Ocean. 



Margarita lacazei Velain, Comptes rendus, 1876 ; Archives 

 Zool. Exper. et Generale, xvi, 1877, ]). 118, t. 4, f. 4-6. — M. nigri- 

 cans Velain, lib. cit., t. 4, f 6. 



Var. nigricans Velain. PI. 66, fig. 93. 



Differs in its smaller size, stronger spiral ridges, and black colora- 

 tion. Alt. 02, diam. 6] mill. 



This is of course no Margarita. I am not certain of its generic 

 position. It was collected in great numbers by the naturalists at- 

 tached to the French expedition to the islands of St. Paul and 

 Amsterdam, for observing the transit of Venus in 1874. 



G. GLOBULARius Schrenck. PI. 69, fig. 10. 



Shell depressed-conical, imperforate or obsoletely rimate, oliva- 

 ceous-brown, spirally lirate with reddish, with here and there whit- 

 ish undulating rays; whorls 5, planulate, separated by deep sutures, 

 last Avhorl somewhat convex, subangular ; base plano-convex, brown, 

 spirally striate with red ; umbilical tract callous, rosy ; aperture 

 rounded-quadrangular, the columellar margin veiy minutely biden- 

 ticulate. with a little ])it between the teeth ; outer lip margined 

 with black inside ; throat white, pearly. Alt. 7, diam. 9 mill. 

 (^Schrenck.') 



Bay of Hakodadi, Jajmn. 



