PLATE V. 
A. stands for body-cavity. 
e. stands for darkly pigmented epithelium. 
a. „ 
outer layer of (longitudinal) muscles. 
in. 
9 
intestine. 
B. „ 
band of connective tissue. 
M. 
outer maxilla. 
b. „ 
second layer of (circular) muscles. 
m. 
9 9 
muscle masses. 
0. „ 
organ of unknown function. 
n. 
9 9 
nerve cords. 
c. „ 
inner layer of (longitudinal) muscles. 
0. 
9 9 
ovarian coeca. 
C.gl. „ 
cement-glands. 
od. or 
Od. 
oviduct, 
Ch. 
chitinous outer wall of peduncle. 
t. stands for testis. 
D. 
main cement-duct. 
s. 
9 9 
segmental organ. 
D'-D'" „ 
branches of the main cement-duct. 
Sd. 
9 9 
segmental duct. 
d. 
initial cement-ducts. 
X. 
99 
(elastic) fibres of the connective tissue. 
Figs. 1-3. Segmental organ of Scalpellum vulgare,- Leach. 
Transverse section of the body of Scalpellum vulgare, Leach, about the second 
pair of maxillae ; magnified 27 diameters. The band of connective tissue (B) 
contains coeca of the testis. 
Section of the segmental funnel ; magnified 305 diameters. 
Section of the segmental organ ; magnified 106 diameters. 
Figs. 4, 5. Anatomy of the peduncle of Lepas anatiferg, Linn. 
Fig. 4. Transverse section near the upper extremity ; magnified diameters. 
Fig. 5. Part of a section near the upper extremity ; magnified 58 diameters. 
Figs. 6, 7. Anatomy of the peduncle of Scalpellum vulgare, Leach. 
Fig. 6. Part of a section at about 5 mm. from the upper extremity ; magnified 33 
diameters. The chitinous outer wall with the scales removed. 
Fig. 6*. One of the cement-glands ; magnified 192 diameters. 
Fig. 7. Part of a section near the lower extremity ; magnified 33 diameters. 
Fig. 1. 
Fig. 2. 
Fig. 3. 
Figs. 8-11. Anatomy of the peduncle of Scalpellum regium (Wyv. Thoms.), Hoek. 
(The chitinous outer wall with the scales removed.) 
Fig. 8. Part of a section near the upper extremity ; magnified 8)> diameters. 
Fig. 9. Section at about 1 cm. from the upper extremity ; magnified 8| diameters. 
Fig. 10. Section about half the length of the peduncle ; magnified 8^ diameters. 
Fig. 11. Group of cement-glands in the upper extremity of the peduncle; magnified 58 
diameters. 
