= 
1875. ] MR. E. A. SMITH ON THE GENUS ALABA. 537 
peristoma continuum, ad margines superiorem labralemque ali- 
quanto expansum. 
Diam. max. 20 mill. Diam. min. 15. Alt. 16. 
Hab. California. 
This very remarkable species was collected in California by Lord 
Walsingham ; and two specimens were presented to the British 
Museum by Mr. J. H. Ponsonby—a most enthusiastic conchologist, 
with whose name I feel much pleasure in associating the species. 
It has but one relation of any proximity, namely C. newberryt, 
Lea. From this it differs in being of a thinner and lighter build, in 
Carinifex ponsonbii. 
the more rapid increase of the whorls, and consequently in the pro- 
portionally much larger size of the last in comparison with the 
penultimate. C. newberryi has the upper surface of the whorls 
broadly flattened and then acutely keeled and angulated, whereas in 
the present species they are rather convex, lack the carination, and 
display but the faintest approach to an angulation, and this is situ- 
ated near the wpper and not the dower suture. Again, the mouth of 
the latter species ascends a little on the body-whorl; in the former it 
descends a trifle. Finally, Lea’s shell is much more coarsely striated, 
and clothed with a strong yellowish-olive epidermis, whereas that 
which invests the present species is very thin and of a very pale olive 
tint. On each side of the rounded keel, encircling the umbilicus, 
there is a shallow depression. 
3. Remarks on the Genus Alaba, with the Description of a 
new Species. By Enear A. Samira, F.Z.S. 
| Received June 23, 1875.] 
The genus Alaba was first characterized by Messrs. H. and A. 
Adams in the ‘Genera of Recent Mollusca,’ p. 214, and there con- 
sidered as a subgenus of Cerithiopsis. 
Subsequently it was raised to the rank of a separate genus and 
removed by A. Adams (see Annals & Mag. Nat. Hist. 1862, x. p. 294) 
to the subamily Litiopine. 
Here the shells included in the group are described ‘ anfractibus 
plicatis seu varicosis, vertice submammillato. Apertura ovata, labio 
szepe vix truncato.”” No mention is made of the nature of the oper- 
culum, 
