178 i.lLLINA-OVULACT^EON. 



Of the two specimens (types) in the Briti>h Museum, one is with- 

 out the bands. The columella is obliquely truncated. This species 

 differs from the preceding in being very pellucid, in the gray, not 

 red color of the spiral bands, and the absence of longitudinal wavy 

 lines. 



B. DE8HAYE8H Pilsbry. PL 45, figs. 27, 28. 



Shell ovate-turgid, thin pellucid ; apex obtuse, white ; encircled 

 by two narrow, distant black lines. Spire short, obtuse. Whorls 5, 

 narrow, convex, separated by a subcanaliculate depressed suture ; 

 last whorl large, obtuse with base transversely delicately sulcate. 

 Aperture ovate-elongate, narrow and subemarginate behind, colum- 

 ella cylindrical, narrow, straight. Alt. 15, diam. 10 mill. (DA.). 



Island of Reunion (Dh.). 



Bulla vitrea Pease, DESHAYES, Moll. Reun., p. 56, pi. 8, f. 2, 3. 

 Bullina vitrea MARTENS in Mobius' Reise n. Mauritius, p. 304. 



Thisspecies differs from B. vitrea Pse. in the non-truncated colum- 

 ella and more obese form. The shell is thin, semi-transparent, 

 milk-white, with two lines of intense black-brown. The suture is 

 deep and somewhat channelled ; last whorl five-.-ixths the entire 

 length of the shell. Entire surface sculptured with fine, equal, 

 shallow spiral grooves, in the bottoms of which a lens shows a regu- 

 lar punctation like that of Actceon. The outer lip is arched forward, 

 formini: a sort of shallow sinus behind. 



Genus OVULACTJEON Dall, 1889. 



Ovulactcnon DALL, Blake Gastropoda, Bull. M. C. Z., xviii, p/42. 



Shell cypneiform, involute, with an apical perforation, as in 



Bulla-, columella simple, without plaits; margin of the aperture 



MIK.US, simple, thickened, the callus on the body elevated, 



parallel with the outer lip; aperture narrow, almost linear, slightly 



effuse at the extremities, as long as the shell. Type 0. Meek! I Dall. 



This interesting form resembles nn involute GlobicniH'lm with 



rate apex and thickened ajM-rture, or a rounded Art"n'fla 



without plaits. In the implicate series of the .1<Y,,,,///V,/ it holds a 



analogous to that of Oyprceactu:",, White amonr the plicate 



forms. (Dall). 



IK ii Dall. PI. 49, figs. 20, 21. 



Shell with the outline of a small C>/i>r<Ki, like C. edenfnln, widest 

 in its posterior third, white, polished with fine, distinct, im- 



