re' so 



AN ELEMENTARY TEXT-BOOK OF BIOLOGY. 



Fig. 15. _ ASCARIS ( A, B, C, D, H, a, c, K, G, after Leuckart; E, mainly 

 after Vogt and Yung ; H, b, after Van Beneden ; L, after Butschli). 

 A-D (enlarged), dorsal, ventral, and front views of anterior end, and 

 side view of posterior end of $ ; d.lp and Lip, dorsal and lateral lips, 

 possessing tactile papillae, and surrounding mouth, m; d.l, dorsal line ; 

 ex, excretory pore ; sp y copulatory spicules. E, Part of transverse 

 section of $ , much enlarged ; c, cuticle ; ep, epidermis, thickened into 



