RINGICULA. 405 



R. mariei MORL., J. de C., 1880, p. 152. 



One of the smallest species known. Smaller than R. prismatica, 

 less ventricose, with two lip-teeth and a non-channelled suture. It 

 has a deeper suture than It. goujoni, the second fold is stronger and 

 the ornamentation different. 



R. ACUTA Philippi. 



Shell ovate-oblong, acuminate, transversely striated, the last 

 whorl a little longer than the spire ; aperture made ringent by the 

 labrum being strongly thickened in the middle by a produced coarc- 

 tate callus. Alt. 3J mill. 



Aden, Red Sea (Phil.) ; Java (Dupuy) ; Gulf of Oman, Gwadar, 

 Bombay, Ceylon, Arakan (Nevill) ; Singapore (Stoliczka). 



R. acuta PH., Zeitschr. f. Mai. 1849, p. 33. MORLET Journ. de 

 Conch. 1878, p. 116. ISSEL, Mai. Mar Rosso p. 137. NEVILL, J. 

 A. S. Beng. xliv, pt. 2, p. 101. R. minutaH. AD., P. Z. S. 1872, p. 

 11, pi. 3, f. 14. 



A narrow, acute form, almost exactly the same as R. striata Ph. 

 (fossil), but the striae less closs, less conspicuous, and the lip in adults 

 strongly thickened within, produced in a blunt tooth in the middle. 



(Ph.). 



Var. MINUTA H. Ad. PI. 47, fig. 70. 



Shell solid, acuminate-ovate, sculptured with distant transverse 

 sulci, white ; spire acuminate ; whorls 4, slightly convex, the last 

 ample ; aperture ear-shaped, inner lip moderately calloused, provided 

 with two folds; parietal tooth conspicuous, delicate; lip thickened, 

 one-toothed within. Alt. H, diam. f mill. 



Red Sea. 



R. SAvroNYi Morlet. PI. 47, figs. 85, 86. 



Shell small, ovate-globose, smooth, the spire short, acute ; whorls 

 5, convex separated by a simple suture, the last whorl two-thirds the 

 entire length of the shell, base rounded. Aperture coarctate, the 

 margins joined by a callus ; columellar margin arcuate, triplicate, 

 the upper fold strong, lower folds thick immersed in the callus, which 

 partly covers the canal ; outer lip smooth, rectilinear, margined 

 outside, inside for two-thirds of the length dilated, subdentate. Al r. 

 3, diam. 2 mill. (Mori.). 



Bay of Suez, Red Sea. 

 27 



