Plu 168 



Plumulose. — When the hairs branch out laterally 

 like feathers. (L. phmula, a little feather.) 



Poculiform. — Cup-shaped. (L. poculum, cup, and 

 forma, shape.) >See Proculiform. 



Podeon. — The sixth segment in insects, (dr.) 



Podical plates. — A pair of small plates situated at 

 the side of the posterior ventral anus. 

 (Theobald.) (L. podicns, pertaining to a foot.) 



Podothecae. — Leg-cases, that portion of the theca 

 enclosing the legs. (Gr. 'pons, podus, a foot, and 

 theca, a case.) 



Poisers. — Appendages in the place of hind wings, 

 originating directly beneath the callosity of the 

 metanotum. (O.F. poiser, to weigh.) See 

 Halteres. 



Poison-glands. — The glands secreting the poison, 

 generally two in number connected by a more or 

 less simple duct to the poison-sac. 



Poison-sac. — The bag or sac for the reception of 

 the poison secreted by the poison-glands. (Fr. 

 poison, from L. potionem, ace. of potio, a draught.) 



Polar cells. — While the primitive-cell segmentation 

 is still in progress, before the formation of the 

 inner-layer, a " polar-cell " is separated from 

 the hinder pole of the egg. This by successive 

 halving divides into eight, which after the forma- 

 tion of the blastoderm, pass through it, and 

 divide into two groups, taking up positions on 

 either side of the hind gut, from these cells the 

 eggs or sperm cells of the developing insect 

 arise. (Gr. polos, a pole.) 



