THE NAUTILUS. 



There were also worn valves of several other Mactridce collected. 



Mesodesma arechavalettoi (Ihering MS.) Pilsbry. Maldonado 

 Bay, Uruguay (young) ; Mar del Plata, Argentina. 



Mytilus darwinianus Orb. 



Mytilus edulis L. (? platens is Orb.). 



Mytilus canaliculus Hani. 



Nucuht puelcha d'Orb. N. Uruguay ensis E. A. Smith does not 

 seem to differ materially from this species. 



Ostrcea puelchana d'Orb. 



Pecten nucleus Born, var. ? 



Pecten sp. undet. 



Peeturiculus longior Sowb. 



Petricola like pholadiformis, but less strongly sculptered. One 

 valve. 



Plicatula ramosa Lam. 



Semele (Abrafy urugiiayensis n. sp. 



Tagelus yibbus Sperigl. (platensis Orb.). 



Tellina urugiiayensis E. A. Smith. 



Thracia Rushii n. sp. 



ISAAC LEA DEPARTMENT. 



[Conducted in the interest of the Isaac Lea Conchological Chapter of the Agassiz Associa- 

 tion by its General Secretary, Mrs. M. Burton Williamson.] 



The name of Miss Zeola Downing, Long Beach, California, is 

 added to the membership roll of our Chapter. 



When last heard from Miss Anna Goodsell of San Diego, Califor- 

 nia, was in Cairo, Egypt, after having visited many countries in the 

 Orient. 



FRESH WATER SHELLS IN THE NORTHEAST OF MAINE. 



[From the report of Mr. Olof O. Nylander. From the Transactions of the Isaac 

 Lea Conchological Chapter for 1896] . 



This article is devoted to the fresh water shells found in the Fish 

 River Lakes and Aroostook River, northeast of Maine. After se- 

 curing a good supply of provisions, tent, boat and apparatus needed 

 for a long collecting trip in the forest region, a man was employed 

 to accompany us through the journey, and a man with a team to 

 haul rae the distance of 25 miles to Cross Lake on the Fish River. 



