Metamorphosis and Life-histoiy ot Gnathia maxillaria. 479 



Literature cited in Text, 



1. Hesse, E, Memoire aur les Pranizes et Ancées. Paris 1864. 



2. Dohrn, A., Untersuchungen über den Bau und die Entwicklung der Arthro- 



poden. 4\ in: Zeit. Wiss. Z. iO. Bd. pag. 55. 



3. Sars, G. 0., Crustacea of Norway. Isopoda. 1899 pag. 51 — 56. 



4. Korscheit & Heider, Lehrbuch der vergleichenden Entwickelungsgeschichte. 



Spec. Theil. 2. Heft 1892 pag. 489. 



5. Batesou, W., & Brindley, H., On some cases of Variation etc. in: Proc. Z. 



Soc. London f 1S92 ls93 pag. 585—594. 

 0. Müller, F., Facta for Darwin. 1869 chap. 4. 



Explanations of Figures on Piate 18. 



Praniza larva. L liver. G gut. ovary. x 20. 



Mouth-parts of Praniza from ventral surface. x 65. 



Male G. maxillaris. x 12. 



Month-parts of male from ventral surface. x 12. 



Female Praniza, dorsal view. x 37. 



Praniza metamorphosing into male, dorsal view. x 37. 



7. Ventral view of Praniza changing into male. / l^t antenna. 2 2nti 

 antenna. .'>' mandible. 4 l^t maxilla. 5 '2nA maxilla. ß larvai 

 Ist maxilliped. 6' definitive Ist maxilliped. 7 larvai 2nd maxilliped. 

 7' definitive 2nci maxilliped. x 160. 



la. Larvai 2"<i maxilliped before metamorphosis has begun. x 160. 



8. Gravid unsegmented female. x 40. 



9. Gravid segmented female. x: 40. 



10. Transverse section through thorax of gravid female. x: 75. 



11. Normal segmented larva, x 75. 



12. Giant segmented larva, x 40. 



13. Dorsal view of mandible. AB measuremeut of length. BC measure- 



ment of breadth. Index - — ^-^ — . x 1 30. 



32* 



