594 MEMOIRS OF THE CARNEGIE MUSEUM. 



Paranu-drainage seem to be not so high, more elongated than those from the lower 

 part of the system. In Lea's original specimen (according to figure and measure- 

 ments given by Simpson), the height is 55 pr. ct., the diameter 45 pr. ct. of length. 

 In another specimen measured by Simpson, the height is 60 pr. ct., the diameter 

 38 i)r. ct. D'Orbigny's measurements give for height 58 pr. ct. and for diameter 

 37 pr. ct. These latter figures agree very w(>ll with mine, and it should be noted 

 that the larger specimens generally give a proiiortionally greater diameter. 



Anatomy. — The soft i^arts of one barren female are at hand for examination. 



Practically identical with the preceding species. The gills, in the present 

 specimen, appear comparatively narrow. The structure of the marsupium (inner 

 gill) is typical. The swellings of the septa ai-e very distinct, and are situated closer 

 to the outer lamina (primary limb). 



50. ANf ODONTITES CLEssiNi (Fischer) (1890). 

 Shells: Plate XLI, fig. 4; Plate XLII, figs. 1, 2. Anatomxj of gills: Plate XLVII, 



fig. 4. 

 Mycetopus plicatus Clessin, Malakozool. Blaett., LI, 1882, p. 190, PI. 4, fig. 7 



{nonien prceoccupatum) . 

 Mycetopus clessini Fischer, Journ. de Conchj^lioL, XXXVIII, 1S90, p. 8, footnote. 

 Glabaris nehringi Von Ihering, 1893, p. 60; Nehring, 1893, p. 163; Von Ihering, 



1910, p. 139. 

 Glabaris clessini Simpson, 1900, p. 930. 

 Anodontites clessini Simpson, 1914, ]). 1450. 



Type-locality: ? 



Other Localities. — Rio Sta. Maiia, Rio Grande do Sul, Brazil (Von Ihering) 

 (tributary to Ibicuhy and Uruguay); Rio Piracicaba, Piracicaba, Sao Paulo, Brazil 

 (Von Ihering); Rio Piracicaba Mirim, Piracicaba, Sao Paulo, Brazil (Nehring); 

 Rio Paraguassu, Bahia, Brazil (Von Ihering, 1910). 



New Locality. — Rio Vaccahy Mirim, Santa Maria (da Bocca do Monte), 

 Rio Grande do Sul, Brazil (J. D. Haseman coll., January 29, 1909). Twelve speci- 

 mens, all with soft parts, males and females. 



Distribution. — Positively known from the Uruguay drainage and the head- 

 waters of the Parana. In addition, it has crossed over into certain coastal streams 

 in Brazil. Our locality in Rio Vaccahy Mirim belongs to the Jacuhy-Guahyba- 

 system, but is close to Von Ihering's record from the Uruguay drainage, but on 

 the other side of the divide. This species has been found also in the Rio Paraguassu 

 in Bahia, well to the North, and separated from the rest of the range in the upper 

 Parana (Piracicaba). But probably some kind of connection will be found. 



