POST-PUERULUS STAGE OF JASUS LALANDII. 



195 



arrangement and fewer spines. There are still, as in the puerulus, two 

 spines between the large anterior median spines and the first marginal. 

 They are, however, closer together and there is an additional small spine at 

 the base of the first marginal. These marginal spines are now six in 

 number, this being the number in the adult, where, however, there are four 

 accessory spines to the first marginal, and the other marginals have accessory 

 spines. In some of the larger phyllosomas, believed to be of Jasus, there 

 were two median anterior spines and three marginal spines on each side of 

 the telson. These latter, however, were not free, but under the cuticle. 



Before leaving the carapace it may be mentioned that there is in the post- 

 puerulus no trace of the lateral ridges of the puerulus stage, the carapace 

 being rounded as in the adult. 



(3) Exopodiles of walking-legs. 



One of the legs was compared with its cast cuticle and no trace of the 

 exopodite, which is easily seen in the cast cuticle, was found in the new 

 limb. There was, however, a slight bulging of the cuticle, apparently marking 

 the place of the exopodite. 



(4) Third maxillvpedes. 



No marked difference was observed in the two stages with regard to the 

 relative position of these appendages, being widely separated at the bases in 

 both. This is readily observed and may be a useful character to separate 

 this post-puerulus from succeeding stages, for in a specimen only 27 mm. in 

 length they are close together. The exopodite in the post-puerulus was, 



prof 



Fin. 8. —Third maxillipede of post-puerulus. Fig. 9. — Third maxillipede of puerulus. 



en., eudopodite ; ex., exopodite ; prot., protopodite. 



however, decidedly longer, reaching to the meropodita as in the adult. The 

 additional length was made up of a segmented flagellum. The relative 

 length of the non-rlagellar parts is the same from the puerulus to the adult 

 (figs. 8 & 9). 



