EXPLANATION OF THE PLATES. 



Page 

 Plate L — Rhinopomastus Smithii 3 



Fig, 1. — Represents the bill seen from above with the 



incumbent scales in the proper place. 



2. One of the scales removed. 



3. Left foot seen from above. 



4. Hallux. 



5. Bill of the natural size, showing the scale removed 



and the true membrane covering the nostrils. 



Plate IL^^Fig, 1. Diplolepis depressa 16 



2. Cheiropachus quadrum 25 



For remaining references to this plate 29 



Plate HL — The principal figure represents the shell of Argonauta 

 Argo with its inhabitant of the natural size. The 

 ova which occupy the greater part of the shell are 

 seen distinctly in the fractured aperture and rising 

 above the edge imder one of the arms, and feintly 



through the medium of the shell 57 



Fig, 1. — h one of the ova with its filament. 



2. — The shell of an ovum broken, with the contents 



diffused. 

 3. — A portion of the same ovum, shewing distinctly 

 its external surface. These three figures, 

 which are very highly magnified, are re- 

 ferred to in Dr. Roget's letter. 

 4. — A bunch of the ova of the natural size. 

 5. — An ovum highly magnified. 

 6. — One of the acetabula magnified. 

 Plate IV. — Sciurus Rafflesii 113 



