230 C. H. EIGEXMANX AND C. KENNEDY. 



long, from the Rio Grande do Sul possesses an adventitious left 

 ventral. The right and left ventrals are normally developed and 

 of equal size. The left ventral is possibly placed a little higher 

 than the right. The adventitious ventral is placed between the 

 two normal ventrals slightly in advance of them and near the left 

 one. It is shorter- - 15 mm. as compared with 19 mm. than 

 the normal ventrals. It possesses one ray less - - 8 instead of 

 9 than the normal ones and its first ray is bent sickle-fashion. 



' 



