230 RETUSA. 



sulcated, above and below transversely striated ; spire not visible, 

 apex slightly umbilicated ; aperture narrowed above and greatly 

 dilated below ; outer lip acutely truncated above ; columella reflected, 

 rather callous in the middle ; umbilicus deep (Ad.). 



China Sea (Cuming)- 



Bnlla (Atys) pyriformis AD., Thes. Conch., ii, p. 589, pi. 125, f. 

 128. Sao pyriformis AD., Gen. Rec. Moll., ii, p. 21. 



R. NITIDA A. Adams. PI. 33, fig. 65. 



Shell very small, obovate, white, opaque, shining, dilated at the 

 base, apex rounded and deeply umbilicated, transversely striated 

 above and below ; aperture produced above and narrow, inferiorly 

 dilated ; columella simple, reflected ; umbilicus small ; outer lip 

 rounded superiorly and arched (Ad.). 



Shores of Borneo (Cuming). 



Bulla (Atys) nitida AD., Thes. Conch., ii, p. 589, pi. 125, f. 127. 



R. LAGENULA A. Adams. Unfyured. 



Shell cylindrical-pyramidal, swollen below, the umbilical region 

 impressed, transversely striated, the strise rather distant ; dull white ; 

 apex perforated ; aperture linear, much dilated below ; inner lip 

 short, thickened ; outer lip straight, posteriorly produced, anteriorly 

 rounded and arcuate (Ad.). 



Gulf of Pe-chili, 5 fms. (Ad.) 



Sao lagenula AD., Ann. Mag. Nat. Hist. (3), viii, p. 139. 



R. FOLLICULUS A. Adams. Unfigured. 



Shell ovate, umbilicate, rather solid; base dilated, gibbous; 

 smooth, transversely striated posteriorly ; apex profoundly perforate. 

 Aperture dilated in front, narrow behind ; inner lip thickened ; outer 

 lip strongly produced behind and acuminately angular (Ad.). 



Tabu-Sima, Japan, 25 fms. (Ad.). 



Sao folliculus AD., Ann. Mag. N. H. (3), ix, p. 160. 



The only species resembling this is S. pyriformis A. Ad., from the 

 China Sea; but that species is much more ventricose, and more 

 attenuated posteriorly (Ad). 



R. PHIALA A. Adams. Unfigured. 



Shell cylindrical-pyramidal, attenuated anteriorly [?], subcon- 

 stricted below the summit, rimate, transversely striated above and 

 below ; vertex profoundly perforated ; aperture linear, coarctate 



