THE NAUTILUS. 
Polynices brunnea Link., San 
Paulo. 
Polynices rufilabris Rve.* 
Natica canrena Lam. 
Natica pusilla Say (1). 
Natica sulcata Lam. 
Acmea onychina Gld. 
Phasianella minuta Anton. 
Uvanilla americana Gmel. 
Astralium tuber L. 
Omphalius hotessierianus Orb. 
Calliostoma jucundum Gld. 
Calliostoma jujubinum Gmel. 
Subemarginula octoradiata 
Gmel. 
Fissurella rosea Gmel. 
Fissuridea alternata Say. 
Plicatula ramosa Lam. 
Spondylus spathuliferus var. in- 
ermis. 
Pecten ornatus Lam. 
Mytilus exustus Lam. 
Botulina opifex Say. 
Area jamaicensis Gmel. 
Arca imbricata.* 
Mactrella Iheringi n. sp. 
123 
Arca auriculata.* 
Area candida Ch., San Paulo. 
Lucina costata Conr. 
Chama congregata Conr. 
Cardium levigatum L. 
Venus pectorina Lam. (also 8. 
Paulo). 
Venus cribraria Conr. 
Venus circinata Born. 
Venus subrostrata Lam. (beaui 
Recl.). 
Cytherea varians Wood. 
Dosinia concentrica Born, S. 
Paulo. 
Lucinopsis tenuis Recl., 8. Paulo. 
Tagelus mollis Gould, Rio 
Grande do Sul. 
Tagelus gibbus Spengl. (+ pla- 
tensis Orb.). 
Macoma constricta Brug. 
Mactrella Iheringi Dall, n. sp., 
San Paulo. 
Semele reticulata Gmel. 
Bouchardia rosea Mawe (Rio ?). 
Shell thin, white, inflated, with small and prominent beaks, ex- 
ternally with fine concentric, and a few irregular, radial lines, and 
a silky-yellowish epidermis, the beaks median, smooth, with an obso- 
lete posterior keel, the lunular region widely and deeply impressed ; 
hinge of the subgenus, the pallial sinus angular, reaching to the 
vertical of the beaks. Lon. 65:0; alt. 52:0; diam. 32°0 mm. 
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. ] 
Volume 8 of the Transactions has begun its annual round of the 
Chapter members. It will be some time before every member has 
