G. H. F. Nuttall 
303 
V-shaped distally, and, when extruded, it is flexed forward and down¬ 
ward so that its point impinges upon the dorsal surface of the male’s 
abdomen. 
St.pen 
--Vpen 
Fig. 2. Pedkulus humanns (S- Extruded copulatory apparatus seen from the side. 
Semi-schematic figure. The extruded parts, drawn from a carmine-stained pre 
paration in ioto, show the distribution of the muscles in the vesica penis {V. pen.): 
to the walls of the sack, the statumen penis {Si. pen.) and penis (Pen.), the dilator 
being flexed and impinging upon the dorsal surface of the abdomen. The lower 
part of the abdomen is schematized from sections and dissections. 
5egt.5 
My a I 
Segt.6 
-B.P 
Mretrpl 
Mfiex.dii 
Pen 
t 
1 ' 
\M.rhtr.Vp 
M.protrpL 
We may now consider in greater detail some of the chitinous struc¬ 
tures which constitute the apparatus. 
