APPENDIX. 217 



7, a little convex, slowly and regularly increasing, separated 

 by a somewhat impressed suture, the last whorl convex, occu- 

 pying three-fifths the length. Aperture suboblique, semilu- 

 nate, elongate, acutely angulate above, subangular below at the 

 base of the columella, moderately convex outwardly. Peri- 

 stome unexpanded, acute; columella straight, dilated above, 

 tapering downwards. Length 44 to 46, diam. 22 to 24.5 mm. ; 

 aperture alt. 18, diam. 11.5 mm. (RocKbr. et Germ.). 



Congo valley: between the rivers Aba and Dongou, at an 

 elevation of 1100 meters. 



Limicotaria joubini R. et G., Bull, du Mus. d'Hist. Nat. 

 (Paris), 1904, p. 142. 



LIMICOLARIA CENTRALIS Germain. 



This species belongs to the series of large Limicolarias of 

 the group of L. turriformis Martens, but is distinguished 

 from the latter by its shape, being more enlarged at the base, 

 relatively less long with an equal diameter; by the more 

 rapid increase of the spire, composed of only 9 whorls, which 

 are much less convex, the profile being nearly flat; the last 

 whorl is relatively more developed, .64 of the total length 

 (while in turriformis it is only .57). The sutures are less 

 deep ; the aperture is larger, the columella more strongly pli- 

 cate, the umbilicus larger, and bounded by a stronger angle. 

 This species is particularly notable for its Glandiniform ap- 

 pearance. It reaches the following dimensions: length 79, 

 greatest width 33.5, height of aperture 37, width 18 mm. 



French Soudan, along the bend of the Niger (General de 

 Trentinian, 1898). 



L. centralis Germ., Bull, du Museum d'Histoire Naturelle, 

 annee 1904. no. 7, p. 467. 



Germain's description, given above, has not been illus- 

 trated. The species may be placed next to L. kambeul (vol. 

 xvi, p. 251). 



