138 



THE Gl■:R^r-cKIJS 



G 



H I 



K 



Fig. 67. — Spermatozoa of various animals. \_A-I, L, from Ballowitz; J, A", from \'ON 

 Brunm.] 



A (At the left). Beetle {Copris), partly macerated to show structure of flagellum ; it con- 

 sists of a supporting fibre {s.f.) and a fin-like envelope (/) ; >/. nucleus; a. a. apical body divided 

 into two parts (the posterior of these is perhaps a part of the nucleus). B. Insect {Calathus), 

 with barbed head and fin-membrane. C. Bird {Phyllopiiciiste). D. Bird {Afiiscicapa), showing 

 spiral structure; nucleus divided into two parts («i, t/-) ; no distinct middle-piece. E. Bulfinch ; 

 spiral membrane of head. F. Gull (Z,ar«j) with spiral middle-piece and apical knob. G. H. Giant 

 spermatozoon and ordinary form of Tadorna. I. Ordinary form of the same stained, showing 

 apex, nucleus, middle-piece and flagellum. J. " Vermiform spermatozoon " and, A", ordinary 

 spermatozoon of the snail Paliidina. L. Snake {Coluber), showing apical body (a), nucleus, 

 greatly elongated middle-piece (w), and fiagellum (/). 



