OSTREA, OVIS. 229 



14 rounded and longitudinally striate rays. 5 

 inches long. 

 Jacob&a, having 14 angular rays. 



Section B. Rough, and generally plaited on the 

 outside. The proper OYSTER. 



edulis, (common oyster,) shell suborbicular, rug- 

 ged, with undulate imbricate scales ; one valve 

 flat, entire. Extremely variable in form, size 

 and colour. 



plicatula, (fan-shell oyster,) shell with longitudi- 

 nal wrinkled plaits ; the lower valve a little 

 less and iiatter. Generally cinereous with a 

 mixture of violet, sometimes bluish -white. 

 See MS. P. 



25. OTIS. Spec. ii. 



(bustard,) wave-spotted with black and ru- 

 fous, whitish beneath ; head (of the male) and 

 throat each side crested. 4 feet long. 



See MS. P. 



1 7. Ovis. Spec. 4. 



(sheep,) horns compressed, lunate. 

 See MS. P. 



Varieties. 



Hornless. Horns none or mere rudiments ; tail 



reaching as low as the knees. 

 Black-face. Horned ; tail short, wool short and 



coarse. 

 Merino. Horns spiral and extended outwards ; 



wool fine and plentiful. This variety secretes 



so much oily matter upon the wool that 



dust adheres to it. 

 See MS. P. 



20 



