134 MR. W. K. BROOKS ON LUCIFER: 



PLATE 5. 



Fig. 43. Ventral view of the last Protozoea (DANA'S Erichthina demissa), Toucjth mcn 

 long. 



ex. Exopodite of second antenna. 



en. Endopodite of second antenna,. 

 Fig. 44. Dorsal view of the same larva (ZEiss, A. 2). 



ds. Median dorsal spine of carapace. 



Is. Postero-lateral spines of carapace. 

 Fig. 45. Side view of the same larva at the same stage. 



<is\ Median dorsal spine of carapace. 



tg. Thoracic ganglia. 



?'. Intestine. 

 Fig. 46. Posterior surface of left first maxilla of the same larva. 



1 and 2. Cutting joints of basal portion. 



en. Endopodite. 



so. Scaphognathite. 

 Fig. 47. Left second maxilla of the same larva. 



1>. Basal joint. 



sc. Scaphognathite. 



en. Endopodite. 

 Fig 48. Left first maxilliped of same larva. 



b. Basal joint. 



ex Exopodite. 



en. Endopodite. 

 Fig. 49. Left second maxilliped of same larva. 



(Letters as in fig. 48.) 



PLATE 6. 



Fig. 50. First Schizopod stage (this stage is the equivalent of DANA'S genus Sceletina; 

 of CLAUS'S Acanthosoma stage ; and of WILLEMOES-SUHM'S Amphion stage). 

 The larva passes, by a single moult, which was frequently observed in iso- 

 lated specimens, from the stage shown in fig. 43 to the one which is shown 

 in this figure. 



Fig 1 . 51. Mandible at same stage. 



D O 



Fig. 52. First maxilla at same stage. 



Fig. 53. Second maxilla at same stage. 



Fig. 54. Sceletina larva, two moults later (ZEISS, A. 2). 



s. Antero-lateral spine. 



p. Pigment spot on fourth abdominal somite. 



