c50U CIIARACINIDJ:. 



6. Heiniodus immaculatus. 

 Kner, Denltschr. Wien. Acad. 1859, xvii. p. 157. taf. 5. fig. 9. 

 D. 11. A. 12. V. 12. L.lat. 70-72. L. transv. ^. 



The scales above and below the lateral line are equal in size. The 

 height of the body is contained four times and a half in the total 

 length (wthout caudal), the length of the head four times and three- 

 fourths. The distance between the giU-opening and the vertical 

 from the origin of the dorsal is nearly equal to the length of the 

 head. Upper jaw with about twenty-two crenulated teeth. Pectoral 

 shorter than ventral. Coloration uniform, without lateral spot; a 

 dark band along each caudal lobe. (Kner.) 



Barra do Hio Negro. 



7. Heiniodus longiceps. 



Kner, Denkschr. Wien. Acad. 1859, xvii. p. 152. taf. 3. fig. 6. 

 D. 11. A. 11. Y. 12. L.lat. 79-85. L. transv. 17/12. 



The scales below the lateral line are scarcely larger than those 

 above. The height of the body is a little less than the length of the 

 head, which is one-fourth of the total (wthout caudal). The distance 

 between the giU-opening and the vertical from the origin of the dorsal 

 is much less than the length of the head. Upper jaw with about 

 twenty tricuspid teeth. Eye and its neighbourhood covered -with adi- 

 pose membranes. The pectoral and ventral fins are equal in length, 

 more than half as long as the head. SUvery, the upper part of the 

 giU-opening with the hinder margin black. Interradial membrane of 

 the dorsal fin, and a large blotch in the fork of the caudal fin black ; 

 sometimes an ovate black spot on the lateral line beliind the dorsal. 



Rio l9anno ; Rio Capin. 

 a. Fine specimen. River Capin. Purchased of Mr. Stevens. 



8. Hemiodus microlepis. 



Kner, Denkschr. Wien. Acad. 1850, x-\ii. p. 155. faf. 4. fig. 8. 

 D. 11. A. 11. V. 11. L. lat. 110-112. L. transv. ?i=f^. 



The scales above and below the lateral line arc equally small. The 

 height of the body is contained four times in the total length (with- 

 out caudal), the length of the head four times and two-thirds. The 

 distance between the gill-opening and the vertical from the origin of 

 the dorsal is considerably less than the length of the head. Upper 

 jaw \vith about thirty-two crenulated teeth*. Eye with a very broad 

 adipose membrane, which has only a narrow sUt before the pupU. 

 Ventral much longer than pectoral, but not reaching to the vent. 

 Silvery ; a round black spot on the lateral line behind the dorsal fin. 

 {Kner.) 



Rio Guapore ; Barra do Rio Negro. 



* The text refers to a figure a, whicb should show the form of the teeth, but 

 no such figure is given. 



