606 MEMOIRS OF THE CARNEGIE MUSEUM. 



Remarka. — This species uiidoul)tedly is closely allied to A. Ir'ujona, and dif- 

 fers chiefly in the dimensions. It might be a local variety of it, but since all six 

 of my sjiecimens are rather uniform in their (characters, I take it for a species. 



A. hyrioides is an A. trigona, which is higher and shorter, more inflated, has 

 the outline moi'e sharply angular, and is more oblique. The obliciuity is due to 

 the shortening of the shell and the lower position of the posterior point. The out- 

 line of our species recalls the shape of the genus Hyria, and hence]^the name. 



55. Anodontites mortoniana (Lea) (1834). 



Anodoiita inortojiiaiui Lea, Obs. I, 1834, PL 13, fig. 37. 



Anodonla \L)cdddlii Hupb, 1857, j). 87, PI. 17, fig. 5. 



Anodonta lingidata Hupe, 1857, p. 89, PI. 18, fig. 1. 



Anodon loeddcllii and lingidata Sowerby, XVII, 1868, PI. 20, fig. 80; 1869, PI. 23, 



fig. 90. 

 Glabaris mortoniana and lingidata Von Ihering, 1893, p. 118, 119. 

 Glabaris uieddclli, lingidatus, and mortonianus Simpson, 1900, pp. 928, 929. 

 Ajiodontitcs weddelli, lingulatus, and mortonianus Simpson, 1914, pp. 1442-1445. 



Type-locality. — River Parana. 



Other Localities. — Santa Ana de Chiquitos, Bolivia (Hupe, weddelli) (situated 

 about on the divide between the drainages of the Paraguay and the Amazon); 

 Corumba, Matto Grosso, Brazil (Hupe, lingulala); Rio Paraguay (Von Ihering); 

 Lower Parana (Von Ihering). 



New Localities. — Mountain creek, Sapucay, Paraguay (S. E. of Asuncion) 

 (J. D. Haseman coll., April 5, 1909). One male with soft parts. Headwaters of 

 Rio Paraguay, Santa Rita, Matto Grosso, Brazil (J. D. Haseman coll., June 12, 

 1909). Two specimens, one a male with soft parts. 



Distribution. — This species api)arently belongs to the Paraguay-drainage and 

 the Rio Parana below its union with the Paraguay. Von Ihering (1893, p. 114) 

 does not mention any of the forms belonging to this species from the upper Parana. 



Remarks as to Synonymy. — The three forms, mortoniana, weddelli, and lingulata, 

 are kept as separate species by Simpson, but I do not see any essential differences 

 between them. 



Hupe admits that weddelli is very close to murtoniaiia, but says that it differs 

 in three respects: more swollen shell; narrower and more rounded anterior end; 

 and deeper and larger muscular impressions. These differences arc not sub- 

 stantiated by the figures, in fact, we cannot judge as to the first, since no figure 

 showing the obesity is given. According to the measurements in the text, how- 



