PLATE IV. 
an. stands for anus. 
c. , , cliitinous wall of the peduncle. 
ca. ,, caudal appendages. 
cf. „ connective tissue fibres. 
ct. ,, connective tissue nuclei. 
eg. ,, cement-glands. 
g-gf-g" „ first and second thoracic ganglion. 
g.a. ,, female genital aperture. 
gl. ,, glands of unknown function. 
gt. „ thoracic ganglion. 
i. „ intestine. 
mf. stands for muscular fibres. 
n. 
P- 
s. or st. 
t. 
th. 
vd. 
vs. 
x. 
I.-VI. 
nuclei of the chitinogenous epithelium. 
penis. 
stomach. 
testis. 
thorax. 
vas deferens. 
vesicula seminalis. 
widened portions of the oviducts near the genital 
aperture. 
first to sixth cirrus. 
Figs. 1-7. Anatomy of the male of Scalpellum regium (Wyv. Thoms.), Hoek. 
Fig. 1. Transverse section through a male of Scalpellum regium , which is in a young 
stage ; stomach filled almost entirely with nutritive yolk. 
Fig. 2. Section passing through the vesicula seminalis and a narrow portion of the 
testis. 
Fig. 3. Section passing through a younger male at the level of the cement-glands. 
Figs. 1-3 magnified 94 diameters. 
Fig. 4. Section through one of the cement-glands ; magnified 275 diameters. 
Fig. 5. Section of the wall of a male ; magnified 575 diameters. 
Fig. 6. Muscular fibres ; magnified 575 diameters. 
Fig. 7. Supposed blood-corpuscles ; magnified 57 5 diameters. 
Figs. 8a-8f. Six out of a series of transverse sections through the body of Scalpellum 
calanoides, Hoek ; magnified 41 diameters. 
Fig. 9. Part of a section through the body of Scalpellum par allelogramma, Hoek, at the 
base of the first pair of cirri ; magnified 26 diameters. 
Fig. 10. Part of a section through the body of Scalpellum nymphocola, Hoek ; magnified 
41 diameters. 
