328 BULLETIN OF THE 



Fig. 5. Embryo three days later, from the ventral side. The rudiments of the 

 appendages are now seen from the first to the eighth pair (third 

 pair of maxillipeds). 



Fig. 6. Egg with the enclosed embryo further advanced, viewed from the side. 



Fig. 7. The same, from above. 



Fig. 8. Older embryo, from the ventral side. 



Fig. 9. Still older embryo, from the side. 



Fig. 10. Egg as it appears a few hours before hatching, p, the gluey secre- 

 tion which fixes the egg to the abdominal appendages of the mother. 



Fig. 11. Embryo extracted from the egg just before hatching. The rostrum 

 (rs) lies bent under the head. The appendages of the right side are 

 spread out in order that their structure may be seen. 



Fig. 12. Second maxilla of the same. 



Fig. 13. Appendages of the ninth and tenth pairs of the same (representing the 

 two pairs of chelipeds in the adult). 



Fig. 14. First larval stage, viewed from below, a n, anus. 



Fig. 15. The same ; antenna of the first pair. 



Fig. 16. The same ; antenna of the second pair. The inner branch (r i) de- 

 velops into the flagellum ; the outer branch (r c) into the scale. 



Fig. 17. The same ; parts about the mouth. 



Fig. 18. The same ; two adjacent long setae of the telson, with four very 

 minute setae in the interspace. 



Plate n. 



First larval stage, viewed from the side. 



Second larval stage, viewed from the side. 



The same, viewed from above. 



The same ; oral and thoracic appendages. 



Third larval stage, from below. 



The same ; anterior part of the carapace, viewed from the side. 



X, dorsal spine, y, supra-orbital spine, z, antennal spine. 

 The same ; posterior border of the labrum. 



The same ; first maxilla, a, inner lobe, b, outer lobe, r i, palpus. 

 The same ; second maxilla. Only a small part of the scaphoguathite 



(r e) is represented. 

 Fourth larval stage, side view. 



The same ; first antenna, r i and r e, rudimentary flagella. 

 The same ; second antenna. 

 The same, i 6, labrum. m, mouth. ///, mandible, ms, metastoma. 



IV, first maxilla, a, b,ri,aa in Fig. 8. 

 The same ; abnormally developed appendage of the i)enultimate 



thoracic pair. 

 The same ; telsou and swimmeret. 



