616 MEMOIRS OF THE CARNEGIE MUSEUM. 



marsupial gills they are irregularly alternating. In the female, the inner gill is 

 marsupial nearly throughout its whole length. The septa are stronger and equal, 

 having near the outer lamina a swelling indicating ridges projecting into the lumen 

 of the water-tubes. When charged the egg-masses occupy only the inner com- 

 partments, forming ovisacs, which are somewhat distended, wliile the outer com- 

 partments do not change, and apparently serve as (secondary) water-tubes. Eggs 

 very small. I did not see anj^ larva?. Even in a specimen which had the gills 

 only partially charged (anteriorly), and which might have been discharging, the 

 eggs consisted only of a globular mass of cells enclosed in a membrance. 



57a. Anodontites PATAGONiCA RUBicuNDA (Lea) (1860). 



Diagram of aoft parts: Text-fig. 3, p. 458. 



Section of gills: Plate XLVIII, fig. 8. 



Anodonta rubicunda Lea, Obs. X, 1863, PL 46, fig. 299; Corsi, 1901, p. 455. 



xlnodonta pazii Lea (1866) Obs. XII, 1869, PI. 36, fig. 87. 



Anodon rubicundus Sowerby, XVII, 1870, PI. 30, fig. 118. 



Glabaris rubicunda Pilsbry & Rush, 1896, p. 81 ; Simpson, 1900, p. 913. 



Glabaris latomarginatus fclix Pilsbry, 1896, p. 563, PL 26, fig. 8. 



Glabaris pazii Simpson, 1900, p. 918. 



Anodontites latomarginata fclix Simpson, 1914, p. 1405. 



Anodontites pazi Simpson, 1914, p. 1408; Haas, 1916, pp. 30, 55. 



Anodontites rubicundus Simpson, 1914, p. 1409. 



Type-locality. — Uruguay River. 



Other Localities. — Rio de la Plata, Colonia, Uruguay (Pilsbry & Rush, rubi- 

 cunda) (Pilsbry, felix); Uruguay River, Paysandu, Uruguay (Pilsbry & Rush); 

 Uruguay River, Salto Oriental, Uruguay (Haas). 



New Localities. — Rio Uruguay (in mud), Uruguayana, Rio Grande do Sul, 

 Brazil (J. D. Haseman, February 5, 1909). Twelve specimens, eleven of them 

 with soft parts, males and females. In pond along banks of Rio Negro, Santa 

 Isabel, Uruguay (J. D. Haseman coll., P'ebruary 11, 1909). Three specimens. 

 Rio Ibicuhy, Cacequy, Rio Grande do Sul, Brazil (J. D. Haseman coll., February 

 1, 1909). One male with soft parts. Rio Cacequy (in sand), Gaceciuy, Rio Grande 

 do Sul, Brazil (J. D. Haseman coll., February 2, 1909). One female with soft 

 parts. 



Distribution. — Known only from the Uruguay and the Rio de la Plata below 

 the mouth of the Uruguay, and from the Rio Negro in Uruguay and Rios Ibicuhy 

 and Cacequy in Rio Grande do Sul, these being tributaries of the Uruguay. 



