*5^ 



The Nautilus. 



Vol. v. DECEMBER, 1891. No. 8. 



ACKMK CANDEANA VS. ACM.ffi:A ANTILLARUM. 



BY H. A. PILSBRY. 



So difficult a group are the limpets that their nomenclature has 

 been in a condition little better than chaotic from the earliest times. 

 years ago the West American species were studied by Carpenter, 

 whose genius reduced them to comparative order. It was, however, 

 left for Dale to point out, with i)enetrating in.sight, their generic 

 relationshij^s. 



The species of the Gulf of Mexico have never been studied with 

 the same facilities as those of West America. Dall, in his ' Blake ' 

 Report, enumerates the forms he had seen, with critical notes on 

 their nomenclature ; and the writer has this year given a somewhat 

 elaborate account, founded upon the specimens in the Philadelphia 

 Academy and the Smithsonian Institution collections. 



In the case of A. Candeana however, the earliest publication of 

 the species, under the name Lottia Antillarion, has been overlooked 

 by all. In this case, as elsewhere, we can only find safety amid the 

 flood of conflicting names, by taking our stand upon the solid rock 

 of priority. 



Sowerby's figure of Lottia Antillarum is an excellent and char- 

 acteristic picture of this species in its finest development. 



The synonymy Avill stand as follows : 



Lottia Antillarum Sowerby, Genera of Shells, fig. 4. (Issued 

 before 1881.) 



Lottia Antillarum Sowerby', A Concholog. Manual, p. 59, fig. 

 231, 1839. (A somewhat diflerent color-form.) 



