PARTS CONCERNED IN REPRODUCTION 230 



In Insects, by the " viviparous Aphides' and other 



like forms. 

 The ultimate phase of the typical stao-e is reprcscr.tcd — 

 In Fungi, by the fruit-bearing plant. 

 In other lov;er Cryptogamia, by the thallus. 

 In Mosses, by the perichfetial leaves. 

 In Ferns, Equisetacese, Lycopodiaceie, &c., Ijy the 



sporangium. 

 In the higher plants, by the floral organs. 

 In the Polypifera, by the " urn" (gonophore) and 



blastostyle. 

 In the Trematoda, by the Distoma-fonn. 

 In the Cestoidea, by the mature Tainia-head. 

 In Insects, by the Imago, generally winged. 

 In Animals generally, by what is recognised as the 



adult form. ^ 



GAMOMORPHIC STAGE. 



The proper sperm or germ stock (strohlla, proglottis) is 

 represented — 



In Algse, by the androspore of Bulhochwte. 



In Fungi, by the hymenium. 



In Lichens, by the apothecium. 



In Mosses, scarcely at all. 



In the higher Cryptogamia by the spore, and the 



prothallium developed from it. 

 In the Phanerogam ia, by the pollen grain and ovule. 

 In the Polypifera, by the medusoid, or the sporosac. 

 In the Cestoidea, by a proglottis, or cucurbitiform 

 segment, as in Tcbnla. 



* In the higlier Aniraa-s, liowever, as -n^ll be presently noticed, tbf 

 adult state represents, in addition to the tjj^ical form, the rudiments 

 also of the gamomorphic, in the parts of sex, implanted at a coinpam- 

 tively early period of mbryonic development, on the pre-existiug struc- 

 ture known as the Woljjiaji body. 



