Nos. 1 and 2 (together), containing Paludina, 10 plates. 

 " 3, 4, 5 (together), Limnea, 15 plates. 

 " 6, Physa, 5 plates. 

 " 7, Planorbi-s and Ancylus, 5 plates. 

 " 8, Amnicola, Ampullaria, Valvata, 4 plates. 

 " 9, Paludina, Preface, Index, etc., 2 plates. 



Mr. Tryon's work will be completed in four numbers, each 

 containing three or four plates, crowded with figures, and 32 pp. 

 text. It also will be issued at intervals of about three months. 

 No. 1. Paludina, Amnicola, Valvata. 

 " 2. Limnea. 

 " 3. Physa. 

 " 4. Planorbis and Ancylus. 



TERMS. 



Either work will be sent post-paid to subscribers at the follow- 

 ing rates per number : — 



Haldeman's Tryon's 



Monograph. Continuation. 



Uncolored edition, . . . $1 50 $1 50 



Colored edition, . . . . 2 50 2 50 



Pine edition, duplicate plates, colored 



and tinted, . . . . 3 75 3 75 



The ninth part of Haldeman's work, as well as some odd 

 copies of other parts, may be had at the same rates. 



.,.*.,. A discount of twenty per cent, will be made from these 

 prices to persons subscribing before July 15th. 



