LITERATURE 313 



cell, in order that the ripe egg should constitute an organic 

 whole with yolk disks threaded on its chromatin filaments. 

 Sedgwick's observations on the development of the Cape 

 species of Peripatus ^ make it probable that these dividing 

 membranes are but differentiations of the spongework itself. 

 The disappearance of the membranes would then be nothing 

 more than the r^-arrangement of their substance as a 

 spongework, which must necessarily connect the spongeworks 

 of the neisrhbourins: cells. 



LITERATURE 



Besides the well-known text-books of Balfour iyEin- 

 bryology), Claus {Zoology)^ Gegenbaur, Huxley, and Lang 

 (^Comparative Anatomy)^ Gerstaecker [Cmstacea, Vol V. of 

 Bronn's Klasseii und Ordnungen des Thierreichs), Haeckel 

 Natiirliche Schbpfimgsgeschichte)^ Rollston {Forms of Animal 

 Life), and Zittel, Nicholson, and Lyddeker [Palceontology), 

 the following are the chief works which have been 

 consulted : — 

 Baird. — A Monograph of the Family Apodidee. Proceedings 



of Zool. Soc, London, 1853. 

 Barrande. — Systeme Silurien de la Boheme. Vol. I. and 



Suppt. 

 Beddard. — On the possible Origin of the Malpighian 



Tubules in the Arthropoda. Ann. N.H. (6) IV. 

 Bourne (see Lankester). 

 Brady. — A Monograph of recent British Ostracoda. Tr. 



Linn. Soc. Vol. XXVI. 

 Brauer. — Ueber die Entwickelung des Lepidurus pro- 



ductus, in Sifz. Ber. d. K. Acad. d. WissenscK 



Wien, Vol. LXIX., Ft. I., 1874. 



^ Q-7:!\f:S. VoU XXVI. 



