M Y S I D E A. 



671 



it is more probable that they are ovarian. The particles of the blood 

 are distinct. 



Lucifer, Thompson, Zoological Researches, Cork, April, 1829, Part ii. p. 58 ; Ed- 

 wards, Crust., ii. 467. 



Lucifer acestra. 



Segrnentum antennale non rostratum, carapace multo longius. Oculi 

 prcdongi, segmenti antennalis dimidio bene longiores, pedunculo tenui- 

 ter cylindrico et globo apicali grandi instructi. Segrnentum abdominis 

 sextum btofere duplo longius, maris dentibus duobus infra armatum, 

 dente antico acuto, postico obtuso et recurvato. tegmentum caudate 

 lamina caudali interna duplo brevius, maris, infra gibbosum, gibbosuld 

 lata, non oblique inclinatd. 



Antennary segment much longer than carapax. Eyes very long, 

 much exceeding half of antennary segment, having a slender cylin- 

 drical peduncle and a large globular summit. Sixth segment of 

 abdomen about twice as long as fifth, in males having an acute tooth 

 below near middle, and posteriorly an obtuse process which is 

 recurved. Caudal segment one-third as long as outer caudal lamina, 

 and half as long as the inner, below gibbous in males, the promi- 

 nence broad and not obliquely inclined. 



Plate 44, fig. 9 a, male, enlarged ; b, anterior half, more enlarged ; 

 c, side view of caudal extremity in a male ; c', caudal segment, upper 

 view; d, mandible; e, f first and second maxillae; g, outer maxil- 

 lipeds; h, posterior extremity of thorax, showing glassy eardrop 

 organ at m' ; m", same organ, as it appeared after a short time de- 

 tached from the animal; i, outline of posterior part of thorax of 

 female. 



Pacific Ocean, latitude 6° 30' south, longitude 177° east, near Sher- 

 son's Island. Caught twenty individuals, with twenty-four casts of a 

 hand net, at 7 A. M., March 24, 1841. 



Length, five-eighths of an inch. Colourless, excepting a little red- 



