1894.] NATURAL SCIENCES OP PHILADELPHIA. 31 



Explanation of Plate I. 



Fios. 1, 2, 3. Paryphaiiia llynarla Hutton. Three views of the 

 type specimen, drawn by Mr. H. Suter. 



Fig. 4. Dart of Gastrodonta Ik/era Say. Extracted l)y Mr. Robert 

 Walton from a Philadelphia specimen. 



Fig. 5. Genitalia of Omphaliiia fuligbiosa Griff. Specimen from 

 York Furnace, Pa., collected by Mr. Witmer Stone. 



Fi<4. 6. Pohjgyra tridentata fraiidulenta Pils. Type. Specimen 

 from Morgan Co., W. Va. , opposite Hancock. 



Fui. 7. rohjgijra indeiitata Say. Typical. Specimen from Phila- 

 delphia. 



Fki. 8. Pohjcjyra trklentata jiixtidens Pils. Specimen from Cave 

 Town, Md. 



Figs. 9, 10. Velutbia grmulis E. A. Smith. Two views of a speci- 

 men collected by Prof. Angelo Heiljmn at McCormick Bay, 

 Avestern Greenland. Natural size. 



Fig. 11. Papa polmneiisis Pilsbry. Nicaragua. Front view of 

 type specimen, magnified 30 diameters. 



