424 
CHIYOMATSU ISH1KAWA. 
maxillipedes, and the first, second, third, and fourth pairs of 
ambulatory legs) modify into peculiarly-shaped appendages, the 
tips of which are provided with a structure like avicularia 
(fig. 98, pdb' .), while the one other (i. e. that on the fourth 
pair of maxillipedes) remains as a simple sac. 
While these branchiae are being formed a long seta develops 
on the coxopodite of each of the ambulatory legs, just in front 
of them. These setae are at first comparatively very long. 
Their number gradually increases while their size diminishes, 
until in the adult prawn we have a dozen setse of moderate 
length (fig. 98, cxs.). 
List of References. 
1. *Ed. van Beneden. — ‘ Recherches sur la Composition et la signification 
de l’oeuf,’ 1868. 
2. H. Ludwig. — 1 Ueber die Eibildung im Thiereiches,’ Wurzburg, 1874. 
3. P. Mayer. — “ Zur Entwicklungsgesehichte der Decapoden,” ‘ Jenaische 
Zeitschrift,’ vol. xi, 1877. 
4. Waldeyer. — ‘Eierstock und Ei,’ Leipzig, 1870. 
5. Huxley. — ‘The Crayfish,’ S.S., 1880. 
6. C. 0. Whitman. — “The Embryology of Clepsine,” ‘ Quart. Journ. Micr. 
Sci.,’ vol. xviii, N.S., 1878. 
7. Balfour. — * Comparative Embryology,’ vol. i. 
8. *Lereboullet. — “ Recherches d’embryologie comparee sur le developpe- 
ment du Brochet, de la Perche et de l’Ecrevisse,” ‘ Mem. Savans 
etrangers,’ xviii, J853 ; II “Embryologie de l’£crevisse.” 
9. *Rathke. — Untersuchungen fiber die Bildung und Entwicklung des 
Eiusskrebses,’ 1829. 
10. Reichenbach. — “ Die Embryonalanlage und erste Entwicklung des 
Flusskrebses,” ‘Z. f. w. Z.,’ Bd. xxix, 1877. 
11. Dohrn. — “ Untersuchungen fiber den Bau und Entwicklung der Arthro- 
poden,” ‘ Z. f. w. Z.,’ Bd. xx, 1870. 
12. W. Faxon. — “ Selections from the Embryological Monographs : I. Crus- 
tacea,” ‘ Memoirs of the Museum of Corap. Zoology at Harvard 
College,’ vol. ix, No. 1, 1882. 
13. B. Ulianin. — “ Zur Entwicklungsgesehichte der Amphipoden,” * Z. f. 
w. Z.,’ Bd. xxxv. 
14. Brooks. — “Lucifer: a Study in Morphology,” ‘Philosophical Transac- 
tions,’ 1882. 
