474 PEOF. E. RAY LANKESTER ON GOLFINGIA MACINTOSHII. 



Fig. 5. Lateral view of the scleropyge. 



6. Dorsal view of the sclcrorhynclms and anterior part of the soft body. Showing anus a and 

 position of nephridial aperture dl, dr. 



7. View of the anterior aperture of the sclcrorhynclms. 



8. Ventral view of the sclerorhynchus. 



9. Dissection of the specimen of Golfinr/ia Maclntosldi, showing the position of the introvert y 

 and its retractor-muscles hh, the nephridia gg s the nerve-cord f, and the rectum k, and 

 oesophagus /. The body-wall has simply been cut along a line nearly corresponding to the 

 median ventral, and reflected on cither side. 



10. The introvert and oesophagus have now been thrown forward, after cutting the latter and the 

 retractor-muscles so as to show the position of the anus, and the attachment of the nephridia 

 to the base of the sclerorhynchus internally. 



Plate LVI. 



Fig. 11. The scleropyge opened by a dorsal, median, longitudinal slit, so as to show the nerve-cord lying 

 within its cavil \ . 



12. The introvert opened by a longitudinal incision, so as to expose its papillary surface s (the true 

 outer surface here seen as introverted) ; the tentacles ?• and the mouth e. 



13. A single tentacle enlarged to show the pinnae. 



14. Apex of a tentacle. 



15. 16. Diagrams of transverse sections taken near the base of the sclerorhynchus, to show the asym- 



metry of the arrangement of organs ; fig. 15 includes the introvert; fig. 1G is just behind it. 



17. A portion of the integument from near the oral extremity of the introvert, viewed from the 

 outer surface and showing the mesh-like arrangement of chitinized ridges u, and numerous 

 booklets v, also the soft papillae w placed in the spaces of the mesh-work. It is a question as 

 to whether the soft papillae are an early condition of the chitinized hooklets, or are entirely 

 distinct structures. The position of the booklets on the ridges, and of the papillae in the space 

 enclosed by the ridges, favours the latter supposition. 



18. A small piece of the same, showing clearly the relation of the hooklets to the ridges. 



19. A similar portion of integument taken a little further back (the hooklets do not extend for more 

 than a quarter of an inch behind the oral aperture), showing the ridges u, more powerfully 

 developed, and no hooklets. 



20. A similar portion of integiiment a little further back than fig. 19 (about three quarters of an 

 inch from the mouth), showing the chitinization of the papillae x, and the reduction of the 

 ridges, to pigmented tracts. The chitinized papillae are apparently the same structures as the 

 soft papillse w, of figs. 17, 18, 19. 



21. Lateral views of three chitinized papdlaa from the same region. 



