THE NAUTILUS. 



Scala tenuistriata d'Orb. 



Siphonaria Lessoni Blainv. Gorritti Island, Maldonado Bay. 



Triforis sp. 



Turbonilla interrupta Totten. 



Turbonilla sp. Specimens worn. 



Turbonilla dispar n. sp. 



Turbonilla uruguayensis n. sp. 



Urosalpinx Rushii n. sp. 



POLYPLACOPHORA. 



Chcetopleura Isabellei d'Orb. Maldonado Bay, with the follow- 

 ing. 



Chcetoplenra Tehuelcha d'Orb. Maldonado Bay. Carpenter's Ch. 

 armillata (Man. Conch., xiv, p. 39) described from Gorritti Island, 

 is a synonym. 



PELECYPODA. 



Azara 1 labiata Maton. Poud near Maldonado. 

 Azara labiata var. nimbosa Sowb. Pond near Maldonado ; brack- 

 ish or nearly fresh water. 

 Corbula caribcea d'Orb. 

 Corbula Iheringiana n. sp. 

 Corbula Lyoni n. sp. 

 Corbula patagonica d'Orb. 

 Crassatella (Eriphyla) lunulata Con. 

 Crassatella (Eriphyla^) maldonadoensis n. sp. 

 Cytherea rostrata Koch. 



Diplodonta semiaspera Phil. (Lucina semireticulata Orb.). 

 Donax hanleyanus Phil. 

 Lyonsia hyalina Conrad. 



Lyonsia sp. A nearly equilateral species, new to me. 

 Lucina squamosa Lam. 

 Mactra isabelleana d'Orb. 

 Mulinia near lateralis Say. 



1 Carlos Maria de Pena has called attention to the fact that padre Damaso 

 A. Larraiiaga, a naturalist of Montevideo, in his " Memoria Geologica sobre 

 la formacion del Rio de La Plata, deducida de sus conchas fosiles," written in 

 1819 (? published in 1821), created the genus Matonia for Mya labiata of 

 Maton, thus antedating d'Orbigny's name Azara. I have not seen the work, 

 and would decline to tuake a change until the proper publication and date of 

 Matonia is made positive. See Anales del Mus. Nac. de Montevideo, 1,1894, 

 pil. 



