melvill: new species of turrid^. 167 



in the examples seen by us, some extent of variation in the disposition 

 of these gemmae, and likewise in the number of ribs. The mouth is 

 ovate, outer lip slightly rounded in the largest specimen, straighter 

 in the smaller, and with sinus shallow but well expressed. 

 Columellar margin straight, canal very short, slightly recurved 

 basally. 



Long. 21, lat. 8 mm. sp. maj. ; long 17, lat. 5 mm. sp. min. 



Hah . — Mauritius . 



This species exists, unnamed, in our National Museum. It is 

 of the same alliance as D. digitalis} Eeeve, from the Philippine 

 Isles and Mauritius, and D. ochroleuca,^ Melv. & Sykes, from the 

 Andamans (Booley collection). 



Clavatula gabonensis, n.sp. (PI. V, Fig. 11.) 



Shell pyramidate, smooth throughout, eleven whorled, the two 

 nuclear white, plain, and bulbous, the remainder concave, well 

 exhibiting incremental lines of growth, elegantly and regularly 

 ornamented with fluctuate brown lines, and, on the body-whorl, 

 longitudinal flames ; the periphery is conspicuously angular and 

 bicarinate, mouth ovate, outer lip with median angle, sinus wide, 

 canal moderate, very slightly recurved, columellar margin straight. 



Long. 25, lat. 10 mm. 



Hah. — Gaboon, West Africa. 



To this the only allied species is C. lelieuri, Recluz.' Both species 

 agree in complete smoothness of surface, with no sign of tubercles 

 or spines which characterize all others of the genus. But it difiers 

 from the species just named in the very conspicuous bicarinate 

 angle at the periphery of the body- whorl, thereby rendering the 

 shell attenuate at either extremity, while the character and 

 disposition of the brown markings differ likewise. 



Perrona JESSICA, n.sp. (PI. V, Fig. 12.) 



Shell acuminately fusiform, shining, and very smooth ; whorls 12, 

 of which the two nuclear are transparent, white, and slightly 

 bulbous ; the remainder moderately suturally impressed, with a 

 plicate and conspicuous revolving keel just below the suture, a 

 plain space just below this, and then, joining on to the suture 

 below, another carina raised and ornamented with a spiral 

 row of small shining nodules. The body-whorl is almost straight, 

 quite smooth, shining, and milky white until the close rows of striae 

 commence round the base. Canal prolonged and recurved, outer lip 

 hardly incrassate, sinus wide and well-formed, columellar margin 

 straight, mouth oblong. 



1 Reeve, Proc. Zool. Soc. Lond., 1843, p. 186 ; and Conch. Icon., i. Pleurotoma, 

 pi. xvii, fig. 138. 



^ Proc. Malac. Soc. Lond., vol. ii, 1897, p. 165, pi. xiii, figs. 4, 5. 

 ' Joum. de Conchyl., ii, 1851, p. 210, pi. v, fig. 7. 



