ElGENMANN : COLLECTION OF FlSHES FROM PARAGUAY. 147 



These specimens differ but slightly from Gunther's and Steindach- 

 ner's descriptions of tozniatum, hitherto known only from the Amazon. 

 Dorsal XIV-XVI, 5^ ; A. Ill, 5^ to 6^. Depth 2-f-( 3 ) ; head 3 

 (3) ; head as long as high (longer) ; eye 3 in the head, longer than 

 snout, equals interorbital ; preorbital 2 in eye ; highest dorsal spine 

 equals length of eye or a little longer ; soft dorsal and anal reaching 

 middle of caudal when laid back ; caudal rounded ; pectorals about 

 reaching anal, the threads of the ventrals beyond origin of anal. 



Lateral line with 4-7 canals, 21-23 scales in the lateral series. A 

 dark streak from eye forward, another downward and backward ; a 

 black band broken into spots along the middle of the sides to the end 

 of the caudal ; a series of dark spots along the base of the dorsal ; 

 anterior margin of anal and outer pectoral ray sometimes black. 



Achirid^e. 



103. Achirns jenynsii (Giinther). 

 Corumba (347). 



LIST OF FISHES SO FAR RECORDED FROM THE BASIN 

 OF THE PARAGUAY. 



In the following list one star (*) indicates that the species is pecu- 

 liar to the basin of the Paraguay ; two stars (**) that both the genus 

 and species are peculiar to it ; A indicates that the species is also 

 found in the basin of the Amazon ; B, that the genus is found in the 

 basin of the Amazon j P, that the species is peculiar to the basin of 

 the La Plata ; C, that the species is also found in the coast streams of 

 eastern Brazil, and S, that it is found in the Rio San Francisco. 



Trygonid^e. 



1. A. Potamotrygon hystrix Miiller & Troschel. 



2. A. Potamotrygon dumerili Castlenau. 



ASPREDINID/E. 



3. B.* Dysichthys australe Eigenmann & Ward. 



4. B.* Bunocephalus rugosus Eigenmann & Kennedy. 



5. B. P. Bunocephalus iheringi Boulenger. 



6. B.* Bunocephalus dorice Boulenger. 



