158 THE VOYAGE OF H.M.S. CHALLENGER. 
Structure of the integument of Ascorhynchus glaber, Hoek (figs. 8-10). 
Fig. 8. Transverse section of a part of the integument ; magnified 272 diameters. }, ¢, 
e, as in fig. 1. 
, 9. Transverse section of the thigh of a male; magnified 56 diameters. 1, testis ; 
g, h, i, k, as in fig 6. 
, 10. Cells from the glandular mass of the male; magnified 272 diameters. 
Genital organs, &e., of Ascorhynchus orthorhynchus, Hoek (fig. 11). 
Fig. 11. Transverse section of the thigh of a female ; magnified 56 diameters. k, m, h, 2, 
as in figs. 6 and 7. 
Structure of the integument of Colossendeis leptorhynchus, Hoek (figs. 12, 18). 
Fig. 12. Transverse section of a part of the integument; magnified 170 diameters. 8, e, 
as in fig. 1. 
, 18. Spine; magnified 170 diameters. 
Structure of the integument of Colossendeis megalonyx, Hoek (fig. 14). 
Fig. 14. Transverse section through the thigh of a male; magnified 41 diameters. A, 2, 
as in fig. 6. 
Structure of the integument, &c., of Colossendeis leptorhynchus, Hoek (figs. 15, 16). 
Fig. 15. Transverse section through the thigh of a male; magnified 272 diameters. 9, 
vesicle ; p, wounded canal. 
, 16. Transverse section of the thigh of a female; magnified 56 diameters. m, 7, as 
in fig. 7. 
Structure of the integument of Phowichilidium patagonicum, Hoek (fig. 17). 
Fig. 17. Transverse section of the integument of a female ; magnified 170 diameters. 8, ¢, 
J, as in fig. 1. 
Structure of the integument, &c., of Phowichilidium insigne, Hoek (fig. 18). 
Fig. 18. Transverse section of the thigh of a male; magnified 94 diameters. h, 7, k, as 
in fig. 6. 
PLATE XVII. 
Fig. 1. Colossendeis proboscidea, Sab. (sp.); dorsal half of the body; magnified 6 
diameters. «, intestine; a’, a’, two short czeca not reaching beyond the 
cephalothorax ; b, muscles moving the proboscis; c, heart; d, anus. 
