394 



THE ALIMENTARY CAXAL OF THE IMAGO. 



The fork at the extremity of a ring bounds the edges of the 

 scale (Fig. 50), and the single extremity of the ring runs through 

 the middle of the opposite scale. 



Anthony's Suckers. (PI. XXIII., Fig. 2) The figure is taken 

 from a very beautiful photograph which Dr. H. M. Wright, of 

 Sydney, N. S. Wales, has kindly sent me ; it was taken by 

 him with one of Powell and Lealand's latest apochromatic 

 objectives. 



The oval spaces between the teeth of the rings have the 



Fu;. 50. Details of the Pseudo-trachete. /, a section of the oral surface of the 

 labelice, transverse to the pseudo-tracheal channels ; 2, a surface view showing 

 Anthony's suckers ; j and 4, pseudo-tracheal rings showing the position of the 

 sacculus forming Anthony's sucker, a, simple, and l>, forked end of the rings ; 

 ft, tendinous cord ; it, duct of labial gland : //, hypoderm ; /, papilla ; pt, 

 pseudo-trachea ; s, sacculus forming Anthony's sucker ; tr, tracheal vessels of 

 disc. 



DESCRIPTION OK PLATE XXIII. 



Two surface views of a portion of the oral sucker, showing the details of the Pseudo- 

 trachea; and Anthony's suckers, from photographs taken by Dr. II. M. Wright, of 

 Sydney, N.S.W., by whose kind permission they are published for the first time. 

 IK.. I. A portion of the oral surface of the disc, showing the pseudo-trachea; and 



orifices of the duct of the labial gland. 

 ]"!<;. 2. A more highly magnified view of a pottion of the same, showing Anthony's 



suckers and the orifice of two of the labial ducts. Taken with an apochromatic ,'.;. 



(Powell and Lealand.) 



