Report on Larval Crabs. 



19 



The first abdominal segment forms the posterior side of the pit in which 

 the pereiopods lie. 



The hind lateral border of the second to fifth segments of the abdomen is 

 serrated (fig. 65). It is not always possible to make out exactly the same 

 serration on both sides of the segment. I made out no pleopods. On the 

 dorsum of each of the abdominal segments except the first, there is a pair 

 of little plumose hairs. A pair of studs is present on the second segment, 

 but none was made out on the third. 



The telson difiers from that appendage in Garcinus and the Brachyura 

 dealt with in this paper in having only two external teeth on each prong 

 (fig. 63). 



Several attempts were made to rear the Zoe?e, but without success. 



Zoe?e which had been kept for four or five days were covered with the 

 fine hair-like filaments referred to above. 



Fig. 



Fig. 



10. 

 11. 

 12. 

 13. 

 14. 

 15. 

 16. 

 17. 



18. 



19. 



20. 



21. 



22. 



22a 



23. 



24. 



25. 



26. 



27. 



28. 



DESCRIPTION OF PLATES. 

 PLATE I.. 

 Hyas areneus, Last Zoea III. ; fig. 1a, do., nat. size ; fig. 1b, do., pleopod. 



,, ,, Megalops. 



Portunus holsatus, Megalops ; fig. 3a, do. , nat. size ; fig. 3b, do. , fifth pereio- 

 pod, propodite and dactylopodite. 

 Portunus puber, I. Zoea; fig. 4a, do., nat. size. 

 Crangon trispinosus, I. Zoea. 

 -Eupagurus bernhardus, I. Zoea. 

 Portunus holsatus, Protozoea. 

 Galathea dispersa, ,, 



Garcinus mcenas, IV. Zoea. 



PLATE II. 

 Portunus holsatus, III. Zoea, abdomen. 



,, puber, Megalops; fig. 11a, do., nat. size. 



,, holsatiis, III. Zoea; fig. 12a, do., ,, 



,, ,, First Young Stage; fig. 13a, do., nat. size. 



,, ,, V. Zoea; fig. 14a, do., nat. size. 



,, ,, I. ,, abdomen. 



V 

 ,, puber, Megalops, pereiopods, ventral view ; drawn from the cast 

 integument of a Megalops. 

 Portunus holsatus, I. Zoea, abdomen, ventral view. 

 IV. Zoea, ,, oblique view. 



III. ,, ,, ventral view. 



IV. ,, fig. 21a, do., nat. size. 



V. ,, Telson. 



V. ,, Antenna. (Drawn from a cast integument.) 

 IV. ,, 



Megalops, coxopodite of third pereiopod. 

 I. Zoea; fig. 25a, do., nat. size. 

 First Young Stage, chela. 

 Megalops, chela ; drawn from the cast integument of a 



Megalops. 

 Portunusholsatus, Megalops, bases of pereiopods; drawn from the cast integu- 

 ment of a Megalops. 



