TEICHOCEPHALUS. 



11 



Fiq. 1 6 



Figs. 16 and 17. — Caudal extremity of Triclwcephalus afflnis. Outlined, with the aid of a camera, 

 from two separate specimens mounted and preserved in glycerine, a, epidermis ; h, cutis ; c, 

 coecal end of testis : d, seminal duct; e, intestine; j^, muscle surrounding the sheath of the 

 penis ; g, sheath, and g^ its infundibuliform base ; (/, inner boundary of the sheath ; g, flask 

 or cup-shaped extremity of the sheath ; A, transverse rings ; z, spiculum ; *, base of the spicule, 

 and i, its free curved extremity ; Jc, mass of spermatic particles ; I, cloacal cavity ; w, anus. — 

 Original. 



