Quarterly Journal of Conchology. 1 5 1 



its thinner and lighter build, and in the more rapid increase 

 of its whorls. In C. Newberryi the upper surface of the whorls 

 is broadly flattened, and then acutely keeled and angulated, 

 whereas in the present species they are rather convex, lack the 

 carination, and show but a faint approach to an angulation 

 and this is situated near the upper and not the lower suture ; 

 C. Newberryi is much more coarsely striated and clothed with 

 a strong yellowish olive epidermis, and the mouth descends a 

 trifle on the body-whorl, In the new species the mouth ascends 

 and the epidermis is of a very pale olive and very thin. On 

 each side of the rounded keel encircling the umbilicus there 

 is a shallow depression. 



Remarks on the genus Alaba, with the description 

 of a new species. — By Edgar A. Smith, F.Z.S. 



P.Z.S., 1875, pp. 537 — 540, with woodcut of the new 

 species {Diala Leithii, Smith). From California. 



D. Leithii differs from D. picta in the columella being more ar- 

 cuate, and the aperture more acuminately effuse at the base. The 

 animal has the tentacles of equal (not unequal ) length, the foot 

 not auriculate, and is devoid of the four long tentacular filaments 

 attached to the operculigerous lobe ; the species may eventually 

 form a distinct subgenus. 



The genus Alaba was first characterized by H. & A. Adams as 

 a subgenus of Cerithiopsis. Subsequently it was raised to the rank 

 of a seperate genus and placed in the subfamily Litiopince by A. 

 Adams. 



In the generic diagnosis it is described as " anfractibus plicatis 

 seu varicosis, vertice submammillato. Apertura ovata, labia sa;pe vix 

 truncate" The operculum is not mentioned. Of the enumerated 

 species, A. picta, A. cornea, A. felina, A. inflata, and A. phasianella 

 have the whorls smooth and not plicate or varicose, the labium in 

 A. picta only showing the faintest approach to truncation, the col- 

 umella in the remaining species being rather straight, generally 



