LEPTOTHYRA. 251 



L. RUBRA Duuker, 1882. PL 69, fig. 26. 



Shell small, solid, globose ; Avhorls 4-4^, rotund, marked with sub- 

 grauose transverse costulse ; suture obvious; aperture rotund, irides- 

 cent and pearly within ; lip thickened. 



Alt. scarcely 6, diani. 6-6 ^ mill. (Dunker.) 



Japan. 



Collonia rubra Dunker, Ind. Moll. Mar. Jap., p. 128, pi. 12, f. 7-9. 



Nearly allied to L. sangidnea L., but differing in the sculpture of 

 the ribs. 



L. PURPURASCENS Dunker, 1882. PL 69, fig. 24. 



Shell globose, whorls 5, rounded, separated by subcanaliculate 

 sutures, transversely sculptured by unequal graniferous costulse ; 

 aperture rotund, sulcate within and pearly ; columella thickened. 



Alt. 8, diam. 9-10 mill. (Dunker.) 



Japan. 



Collonia purpu7-ascens Dkr., Ind. Moll. Mar. Jap., p. 129, pi. 12, 

 f. 1-3. 



I have not seen this species, nor L. rubra Dkr. Both are allied 

 to amiissitata Gould, and purpurascens may prove to be a synonym 

 of that species. X. rubra seems to be distinct. 



L. PURPURATA Desh., 1863. PL 54, fig. 61. 



Shell minute, turbinate, subglobose, imperforate, somewhat de- 

 pressed, vivid purple, white-fasciate in the middle; whorls 4, the 

 first obtuse, the following convex, spirally sulcate, the last large; 

 base a little depressed, white at center; aperture very oblique, cii'cu- 

 lar, pearly within, margin thickened; columella arcuate, simple. 



Alt. IJ, diam. 2 mill. 



Mauritius. 

 Var. TRiciNGULATA vou Martens, 1880. 



Subglobose, umbilicate; whorls 3, gradate, the last with three 

 elevated contiguous cinguli; the upper one nodulous, brick-red, the 

 basal white, encircled by a deep red band ; aperture circular, white, 

 columellar margin thickened. {Martens.) 



Mauritius. 



L. ROSEociNCTA von Martens, 1880. PL 68, figs. 14-19. 



Shell globose, imperforate, smooth, white, apex rosy, peripheral 

 fascia rather wide, frequently composite, rose-colored, basal fascia 

 narrow; whorls 31, slightly convex, the last rotund ; suture super- 



