PEOM THE BIO PAEAGUAT. 39 



PLATE VI. 



Chmtostomns gigas, f nat. size, with upper and lower views of head (|) : p. 30. 



PLATE VII. 



Fig. 1. Loricaria labialis: p. 32. 



1 a, upper, 1 b, lower view of head and anterior part of body. 

 Fig. 2. Loricaria apelfogaster: p. 33. 



2 a. upper, 2 h, lower view of head and anterior part of body. 



PLATE VIII. 



Fig. 1. Loricaria parva, with enlarged upper (a) and lower {h) views of head : p. 32. 

 Fig. 2. Tetragonopterus ternetzi : p. 35. 

 Fig. 3. Tetragonopterus ulreyi : p. 35. 

 Fig. 4. Anacyrtus prognathus : p. 36. 



