I5g THE VOYAGE OF H.M.S, CHALLENGEK. 



Structure of the integument oi Ascorhynclius glaher, Hoek (figs. 8-10). 



Fig. 8. Transverse section of a part of the integument ; magnified 272 diameters, h, c, 



e, as in fig. 1. 



„ 9. Transverse section of the thigh of a male ; magnified 56 diameters, n, testis ; 



g, h, i, k, as in fig 6. 

 „ 10. Cells from the glandular mass of the male ; magnified 272 diameters. 



Genital organs, &c., oi AscorJiynchus orthorhynchus, Hoek (fig. 11). 



Fig. 11. Transverse section of the thigh of a female ; magnified 56 diameters, k, m, h, i, 

 as in figs. 6 and 7. 



Structure of the integument of Colossendeis leptorhynchus, Hoek (figs. 12, 13). 



Fig. 12. Transverse section of a part of the integument ; magnified 170 diameters, h, e, 

 as in fig. 1. 

 ,, 13. Spine; magnified 170 diameters. 



Structure of the integument of Colossejideis megalonyx, Hoek (fig. 14). 



Fig. 14. Transverse section through the thigh of a male; magnified 41 diameters, h, i, 

 as in fig. 6. 



Structure of the integument, &c., of Colossendeis lejJtorhynchns, Hoek (figs. 15, 16). 



Fig. 15. Transverse section through the thigh of a male; magnified 272 diameters, o, 

 vesicle ; p, wounded canal. 

 ,, 16. Transverse section of the thigh of a female; magnified 56 diameters, m, i, as 

 in fig. 7. 



Structure of the integument of Fhoxichilidmm 2xitagonicum, Hoek (fig. 17). 



Fig. 17. Transverse section of the integument of a female ; magnified 170 diameters, b, c, 



f, as in fig. I. 



Structure of the integument, &c., oi Phoxidiilidmin insigne, Hoek (fig. 18). 



Fig. 18. Transverse section of the thigh of a male ; magnified 94 diameters, h, i, k, as 

 in fig. 6. 



PLATE XVn. 



Fig. 1. Colossendeis proboscidea, Sab. (sp.); dorsal half of the body; magnified 6 

 diameters, a, intestine ; a\ «^ two short casca not reaching beyond the 

 cephalothorax ; b, muscles moving the proboscis ; c, heart ; d, anus. 



