CEso 144 



of the oesophagus which passes through the 

 proventriculus and opens at various positions 

 in the anterior part of the chylific stomach. 

 (Gehuchten.) 



CEsophagus. — A small tube of the digestive system 

 commencing at the posterior end of the buccal 

 cavity, passing upwards and backwards directly 

 under the brain, and merging into the crop or 

 proventriculus, either at the back part of the 

 head or in the thorax. (Gr, oiso, to carry, 

 and phago, to eat). 



Olfactory. — Pertaining to, or used in smell. (L. 

 oleo, to smell, and facio, to make.) 



Olfactory nerve centres. — Paired swellings con- 

 stituting the deutocerebron. 



Olivaceous. — 'Olive green, resembling the green 

 colour of olives. (Gr. elaia, an olive.) 



Ommateum. — I he compound eye. (Gr. ommatos, 

 the eye.) 



Ommatidia. — The eye elements, those parts of 

 the eye constituting its structure. (Boas.) (Gr. 

 ommaloo, to furnish with eyes.) 



Onischlform. — Shape. 1 like an Oniscus or Wood 

 Louse. {Onischns, a wood louse, and form.) 



Onyches. — Claws,the movable hooks usuallysituated 

 at the tip of the tarsi. (From Gr. onyx, the 

 nail.) 



Onychia. — Foot-pads. (Gr. onyx.) See Pulvilli. 



