366 Anatomy and Physiology of the Family Nepide. [April 
although built on a simpler plan, are as distinctly physiological 
machines as are all vertebrates. 
DESCRIPTION OF PLATES IX, X, XI, XII. 
Fic. 1.—Head of Belostoma aie seen from above, dissected so as to show the 
cephalic glands. In front is seen the beak with the sheath and bristles with- 
drawn, and the bristles aisd to the left. 
FIG. 2.—Side view of beak and portion of head of Perthostoma, with pumping appè- 
ratus and one cephalic ie attached. In this case the sheath extends into the 
beak, as is natural. The bristles are not show | 
Fic. 2 a4.—View from above of the cephalic gland gf adult Belostoma, x about 29 | 
diameters 
Fic. 3. Ligii apparatus of Ranatra (X ). The Malpighian tubes are repre- 
sented in part only, portions having been removed in dissecting. 
Fic, — of adult Belostoma (X 2), showing triangular muscles, the different 
bers of the heart and the afferent openings. Some of the muscular sE 
should be represented as crossing above the heart. Anterior to the muscles 
Fic. 5.—Digestive apparatus of Belostoma (X 2). The salivary ms 
ilium are represented as foo wide. Part of the Malpighian tubes were 
before the drawing was made. 
Fic. 6.—Portion of the head ot Belostoma with the sheath and the pumping te 
ratus attached (magnified at least twenty diameters). The cesophagus vet? 
pumping apparatus from the left. The oblique lines represent the tit 
reads for muscular attachments. 
Fic. 7.—Cross-section of the pumping apparatus (magnified as above). 
Fic. EA es generative apparatus, extended and spread, from & ae 
Belostoma (X 2). Compare with Fig. 14 @. eachovaty 
Fic. oi Faulk generative apparatus of Ranatra (X 3). Three a 
in sight. Below is seen the caecum and a part of the intestine | 
ight. 
Fic. 10.—Male generative apparatus of Ranatra (X 3)- 
elo 
enlarges : 
ejaculatorius. 5 y l ot Det 
Fic. 11.—Male of intromission, Belostoma, consi 
with the camera lucida. 
Fic, 12.--Male generative apparatus of Belostoma (X 2). Menr e 
in, showing tubes within; on the left the sac is removed 
as in Fig. 10, Vas deferens not > d 
Fic. 13.—-Side view of genito-anal prolongation, one seta is 
elevated to the rigkt. On the ae ” the genital sr prolngsion 
latory hook, eo 
Fic. 14.—Genito-anal prolongation and caudal set, front view. 
