PATAGONIAN EXPEDITIONS: ZOOLOGY. 



EXPLANATION OF PLATE XLI.C. 



PAGE 



FigS. 1,2. LlTTORIDINA CHARRUANA (d'Orb.) 558 



Figs. 3, 4, 8. LITTORIDINA AUSTRALIS (d'Orb-). Montevideo . . . 557 



Figs. 5, 6, 7. " " " Bahia Blanca ... 557 



Fig. 9. LITTORIDINA BERTONIANA Pils. Face of type. . . . 559 



FigS. IO, II. POTAMOPYRGUS SCOTTI " " " tWO COtypCS . 563 



Fig. 12. POTAMOPYRGUS PETININGENSIS (Gld.). Topotype from the orig- 

 inal lot 563 



Fig. 13. LITTORIDINA PICIUM (d'Orb.) 558 



Figs. 14, 140. IDIOPYRGUS SOULEYETIANUS Pils. Profile and face of the type. 565 



(VOL. in) 



