PLATE XL 



Euphausia jyellucida, Dana. 



Fig. 1. Adult female, from right side ; magnified about nine times. 



Fig. 2. Same, from above, showing the luminous globules shining through the 

 inteaiument. 



Fig. 3. Preanal spine ; highly magnified. 



Fig. 4. Adult male, from left side. 



Fig. 5. Anterior part of body of a female specimen, together with first caudal segment, 

 from right side, showing the internal organs shining through the carapace. 

 St, stomach ; /, liver ; ^, intestine ; h, heart ; ov, ovary ; ovd, oviduct. 



Fig. 6. Carapace, with eyes, antennular peduncles ; antenna3, anterior lip (L), mandibles 

 (Ji), mandibular palps {Mii), and heart {h), from below. 



Fig. 7. Ocular segment, with left eye, from below, a, larval eye or ocellus ; h, luminous 

 organ. 



Fig. 8. Luminous organ of ocular pedicle, isolated and highly magnified. 



Fig. 9. Gill of antepenultimate pair, with the bulbous basal expansion containing a 

 luminous globule. 



Fig. 10. The latter part ; more highly magnified. 



Fig. 11. Gill of last pair. 



Fig. 12. Rudiment of a leg of penultimate paii* ; highly magnified. 



