PILSBRY: non-marine MOLLUSCA of PATAGONIA. 609 



Near the Mount of Observation (below the mouth of Santa Cruz River). 

 This species is chiefly distinguished by its cardinal teeth, which differ 

 constantly from those of the other Patagonian Pisidia. 



Fig. 19. 



Pisiditan observationis. Interior of right and left valves. 



Family MUTELIDAi. 

 Genus ANODONTITES Bruguidre. 



Anodontites Brug., Journ. d'Hist. Nat. Paris, I, 1792, p. 131 (for A. cris- 

 patits Brug.). 



/'^//^/<?/m Swainson, Malacology, 1840, pp. 287,381 (for Z'. oz;«/^? Swains. 

 = tyapesialis Lam. and P. rotimdatus Swains. = ? Anodonta wood- 

 iana Lea). 



Glabaris Gray, Proc. Zool. Soc. Lond., 1847, P- I97 (for Anodonta 



exotica hsLm.). 

 Glabaris Simpson, Synopsis of the Naiades, p. 916. 

 Patularia Ball, Nautilus, XX, 1906, p. 39 (type/', ovaia Swains, implied). 



Anodontites puelchanus (d'Orbigny). 



Anodonta pttelchana d'Orb., Mag. de Zool., 1835, P- 4o ; Voy. dans TAmer. 

 Merid., Moll., p. 620, pi. 79. figs. 7-9. Doering, Informe Oficial de la 

 Comision Cientificade la Expedition al Rio Negro (Patagonia), 1881, 

 Zoologia, p. 74. 



