162 
woe 
Wife 
18. 
THE VOYAGE OF H.M.S. CHALLENGER. 
PLATE XXI. 
Eye of Nymphon strémi, Kroyer, transverse section ; magnified 272 diameters. 
Eye of Nymphon brachyrhynchus, Hoek, longitudinal section, taken laterally ; 
magnified 170 diameters. 
. Eye of Nymphon brachyrhynchus, Hoek, longitudinal section, passing nearly 
through the middle ; magnified 170 diameters. 
. Rods and ganglion cells from the eye of Nymphon brachyrhynchus, Hoek ; 
magnified 575 diameters. 
. Rods (isolated) from the eye of Nymphon brachyrhynchus, Hoek; magnified 
575 diameters. 
. Gsophagus of Mymphon hamatum, Hoek, transverse section; magnified 272 
diameters. 
. Glands at the end of the cesophagus of Nymphon hamatum, Hoek ; magnified 94 
diameters. a, the glands; s, supracesophageal ganglion; f, first thoracic 
ganglion. 
. Glands at the end of the cesophagus of Nymphon hamatum, Hoek, transverse 
section; magnified 170 diameters. «a, the glands; b, the wall of the in- 
testine. 
. Group of fat cells from Nymphon robustum, Bell ; magnified 272 diameters. 
. Male genital organs of Colossendeis proboscidea, Sab. (sp.), natural size. a, 
testis ; b, intestine. 
. The opening of the male genital organs in the second joint of the leg of Colos- 
sendeis proboscidea, Sab. (sp.). a, testis ; b, intestine ; ¢, vas efferens. 
. Transverse section of the testis of Colossendeis proboscidea, Sab. (sp.) ; 
magnified 94 diameters. 
Histological structure of the wall of the vas efferens of Colossendezs proboscidea, 
Sab. (sp.) ; magnified 575 diameters. 
. Transverse section of the body of Colossendeis leptorhynchus, Hoek, about 
between the second and third leg; magnified 20 diameters. h, heart; v’~’, 
intestine ; 0, ovary ; 7, nervous system. 
. Ovarian egg of Nymphon brevicaudatum, Miers ; magnified 94 diameters. 
. Section of the ovary in the fourth joint of the lee of Nymphon robustum, 
Bell; magnified 94 diameters. 7, wall of the intestinal ccecum ; c, cavity 
completely filled with eggs, when the animal is mature. 
Ege of Nymphon longicoxa, Hoek ; magnified 94 diameters. 
Section through the fourth joint of the leg of Phoxichilidium patagonicum, 
Hoek ; magnified 41 diameters. 
