162 THE VOYAGE OF H.M.S. CHALLENGER. 



PLATE XXL 



Fig. L Eye of Nijmphon atromii, Kroyer, transverse section ; magnified 272 diameters. 

 2. Eye of Nijm^jlion hrachyrhynchus, Hoelc, longitudinal section, taken laterally ; 



magnified 170 diameters. 

 ,, 3. Eye of Nymjjhon brachi/rhi/nchus, Hoek, longitudinal section, passing nearly 



through the middle; magnified 170 diameters. 

 ,, 4. Ends and ganglion cells from the eye of Nymphon hrachyrhynchus, Hock ; 



magnified 575 diameters. 

 ,, 5. Eods (isolated) from the eye of Nymphon hrachyrhynchus, Hoek ; magnified 



575 diameters. 

 „ G. Esophagus of Nymphon hamatum, Hoek, transverse section ; magnified 272 



diameters. 

 ,, 7. Glands at the end of the oesophagus of Nymjihon hamatum, Hoek ; magnified 94 



diameters, a, the glands ; s, supracesophageal ganglion ; /, first thoracic 



ganglion. 

 ,, 8. Glands at the end of the oesophagus of Nymphon. hamatum, Hoek, transverse 



section ; magnified 170 diameters, a, the glands ; h, the wall of the in- 

 testine. 

 ,, 9. Group of fat cells from Nymphon rohustum. Bell ; magnified 272 diameters. " 

 ,, 10. Male genital organs of Colossendeis 2:)rohosciclea, Sab. (sp.), natural size, a, 



testis ; h, intestine. 

 ,, 11. The opening of the male genital organs in the second joint of the leg of Colos- 

 sendeis prohoscidea, Sab. (sp.). a, testis ; h, intestine ; c, vas eflerens. 

 ,, 12. Transverse section of the testis of Colossendeis prohoscidea, Sab. (sp.) ; 



magnified 94 diameters. 

 ,, 13. Histological structure of the wall of the vas efferens of Colossendeis prohoscidea, 



Sab. (sp.) ; magnified 575 diameters. 

 ,, 14. Transverse section of the body of Colossendeis leptorhynchus, Hoek, about 



between the second and third leg ; magnified 20 diameters, h, heart ; i'-r, 



intestine ; o, ovary ; n, nervous system. 

 ,, 15. Ovarian egg oi Nymphon brevicaudatimi, Miers ; magnified 94 diameters. 

 „ 16. Section of the ovary in the fourth joint of the leg of Nymphon rohustum. 



Bell ; magnified 94 diameters, i, wall of the intestinal coecum ; c, cavity 



completely filled with eggs, when the animal is mature. 

 „ 17. Egg oi Nymphon longicoxa, Hoek ; magnified 94 diameters. 

 „ 18. Section through the fourth joint of the leg of Phoxichilidium patagonicum, 



Hoek ; magnified 41 diameters. 



