332 WEST SOUTH AMERICAN SHELLS STEARNS. 



193. Omphalius aureotiiictus Fbs. 

 = Chlorosioma aureotinctum (Fbs.) Auct. 



Beach shells. 



Santa Margarita Island, oif Lower California. 



194. Tegula pelliserpentis WooiT, 

 Beach shells. 



Panama; and from Dead Man's Island, Panama Bay. 

 This form though well characterized specifically, is hardly entitled to 

 generic distinction. 



195. Nerita scabricosta Lam. 



Several specimens. 

 Manta; Panama. 



The Manta example is of unusual size, being quite large, like Gala- 

 pagos specimens. 



196. Nerita Bernhardi Recliiz. 



Common at the latter place. 



Manta (one) ; Panama. 



Manta is a more southerly point than before reported. 



197. Neritina guayaquilensis Sby. 



=XerUina intermedia Sby. 



One specimen. 



Payta. 



C. B. Adams, in Panama Shells, p. 206, says : " This may, according 

 to Recluz, be identical with N. intermedia Sowb. It is certainly identi- 

 cal with shells which have been distributed by Mr. Cuming and by Mr. 

 Petit under the latter name. Mr. Sowerby's figures,* however, seem to 

 represent two species." 



It is quite evident to anyone familiar with the West American Neri- 

 iinw, upon an examination of the figures and text of this group in 

 Tryon's Monograph, that he has considerably mixed them; and Sow- 

 erby, as Adams suggests, has contributed to the confusion. The form 

 referred to by Adams, as well as the shell collected by Dr. Jones, is that 

 figured in Sowerby's Conchological Illustrations, Figs. 7, 7. Specimens 

 agreeing with the above figures, determined by Cuming, have been dis- 

 tributed as Professor Adams states. The Monograph of the Neritince in 

 the " Conch. Illustrations," has precedence over the later " Thesaurus " 

 Monograph, by eight years. 



Sowerby in the former work credits intermedia to the "Bay of 

 Montejo and the Gulf of Nicoya." The former is in Veragua, on the 

 south side next west of the Bay of Panama, and the latter in Costa 

 Rica, on tlie west coast, lat. between 9^ and 10^ N. Dr. Jones's collec- 

 tion extends the range southerly nearly 800 miles. 



* Tbcs. Couch., p. 520, No. 44, PI. 114, Fig, 177. 



