406 RINGICULA. 



R. savignyi MORL., Journ. de Conch. 1878, p. 117, pi. .5, f. 1. 

 SAVIGNY, Descr. de 1'Egypte, Coq., pi. vi, f. 7. 



R. PRISMATICA Folin. PL 47, figs. 71, 76. 



Shell small, ovate-globose, thick, solid, whitish, shining, some- 

 times subdiaphanous ; whorls 5, subcarinated, rapidly increasing, 

 the last very large, three-fourths the length of the shell, sulcate at 

 base ; suture simple ; aperture elongated, oblique, channelled above, 

 the right margin tridentate, reflexed over the base, the teeth sub- 

 acute. (Folin). 



Alt. 2-5, diam. 1'5 mill. 



Port Louis, Mauritius (Nevillj ; Mauritius (Folin) ; Andaman 

 Is. and Ceylon (Nevill). 



R. prismatica FOLIN, Les Fonds de la Mer, i, p. 87, pi. 11, f. 1. 

 MORLET, Journ. de Conch. 1878, p. 118, pi. 5, f. 2. R. apicata 

 NEVILL, Journ. Asiat. Soc. Beng. xl, pt. 2, p. 3, 1. 1, f. 12, 12a; vol. 

 xliv, p. 102. 



Distinguished from R. acuta var. minuta by its polished aspect, 

 and by the last whorl having only three strise at base instead of 

 being entirely striate; it is quite narrow and more contracted, less 

 calloused, with more acute tooth. Fig. 66 of pi. 47 represents the 

 synonymous R. apicata. 



R. FOLINI Morlet. PI. 47, figs. 61, 62, 67. 



Shell very minute, ventricose, thick, regularly and strongly 

 striated ; whorls 4?, slightly convex, separated by a slightly chan- 

 nelled suture, the last whorl half the total length, rounded at base; 

 spire elongated ; aperture narrow, the margins joined by a strong 

 callus; columellar margin arcuate, triplicate, the folds equidistant 

 and of equal size ; lip nearly straight, thickened, prominent in the 

 middle, varicose outside. (Folin). 



Alt. 2-7, diam. 1 mill. 



Carimata (Folin) ; Singapore (coll. Folin). 



R.folini MORL. in Les Fonds de la Mer, iii, p. 268, pi. 1, f. 8 

 (" R.follini" in index, p. 334). MORLET, Journ. de Conch. 1878, 

 p. 119, pi. 5, f. 3. 



