LARVAE OF DECAPOD CRUSTACEA 



411 



Stage IX ? (Fig. 20). Length 25-28 mm. 



Maxillipede i enlarging at base. Exopod of maxillipede 2 with eight setae. Leg 5 of 

 four segments. 



Pleopods larger, biramous. 



Stage X ?. Length 22-34 "^™- 



Maxillipede i with epipod; endopod not reaching edge of maxilla. Exopod of 

 maxillipede 2 with ten setae. Legs with epipods ; gills not developed, but they can be 

 traced under the skin as small round cellular masses. 



Abdomen fully developed, somite 6 with a pair of large dorsal spines at base of telson. 

 Pleopods large, without appendix interna. Uropods large, with small outer spine on 

 margin of exopod. 



Stage VII Stage VIII 



Fig. 20. Panuliriis A, Stages VI-IX. 

 Antennae. b. Maxilla, etc. c. Abdomen. 



Stage IX 



Stage XI ? (Fig. 19). Length 28-36 mm. 



Maxillipede i with endopod longer, sometimes extending to edge of maxilla. Exopod 

 of maxillipede 2 with sixteen setae. Legs with bilobed epipods and gills. 



Pleopods with appendix interna. Uropods with large outer marginal spine on both 

 branches. 



FORM B 



The material of this form from the Atlantic appears to belong to one species only, 

 but the eastern specimens, though of precisely the same type, do not seem to be the 

 same if similar stages are compared. For instance, in the table of measurements, a 

 specimen from St. 438 is included which, though evidently in the same stage as one 

 from St. 690 of 20 mm., differs so much in its measurements that it cannot well belong 

 to the same species. 



In the Atlantic form only five stages can be distinguished, the youngest of which is 

 taken to be stage V, making nine stages in all. I have found only one specimen of the 



