RINGICULA. 403 



R. BOURGUIGNATI Rochebrune. Unfigured. 



Shell thick, subglobose, smooth, pale greenish, the spire acute; 

 ^whorls 5, convex, separated by deep sutures ; aperture elongate, 

 the columellar margin calloused, tridentate, narrower in the middle ; 

 lip thick, biplicate. Alt. 5, diam. 2 mill. (jR.)- 



Mouth of the Casamence, Senegambia, 150 meters. 



R. bourguignati ROCHEBR., Bull. Soc. Philomath, de Paris (7), 

 Tii, 1882-1883, p. 178 (1883). 



Indo-Pacific Species. 

 R. DOLIARIS Gould. PI. 47, figs. 82, 83. 



Shell large, thin, ventricose, ovate, whitish ; spire acuminate ; 

 whorls 4, rounded, engraved with remote transverse sulci, the last 

 whorl ample; suture profound; aperture large; lip narrow, 

 scarcely thickened ; columellar folds delicate, acute ; parietal fold 

 small, delicate; siphonal canal moderate. Alt. 5, diam. 3+niill. 



Hakodate Bay, Japan, 6 fms. (Stirnpson). 



R. doliaris OLD., Proc. Bost. Soc. N. H., vii, p. 325 ; Otia,p. 121. 

 MORL., Journ. de Conch., 1878, p. 126. WATSON, Challenger 

 Gastrop. p. 634, pi. 47, f. 8. 



Peculiar from its thin lip and general want of callus (Gld.~). 



The figures are drawn from specimens identified as doliaris by 

 Watson, collected at Port Jackson, Australia, by the "Challenger." 

 Watson says of them: " Gould observes that this species is peculiar 

 from its thin lip and general want of callus. The Challenger shells 

 are somewhat less tumid than the British Museum specimens, want 

 the round swollen shoulder below the suture, the upper whorls, too, 

 are flatter, and the spire is rather higher ; in all these respects, how 

 ever, the species presents considerable range of variation, and, I be- 

 lieve, may fairly admit the Challenger specimens. The Marquis de 

 Folin, who has a large acquaintance with this genus, kindly exam- 

 ined all the Challenger specimens for me, and I regret that he does 

 not share my opinion regarding the shells under consideration here, 

 which he holds to represent a new species." 



R. ARCTATA Gould. PL 47, figs. 74, 75, 79. 



Shell solid, ovate, acuminate, white ; whorls of the spire 4, con- 

 vex, the last engraved with 10-12 spiral striae; suture profound; 

 -aperture ear-shaped, the lip thickened, swollen within, with folds on 



