PLATE V. 



mds foi body-cavity. 



a. 

 B. 



CVi. 

 D. 



V I>" 

 ■ i. 



iyer of (longitudinal) muscles, 

 baud of connective tisane, 

 second layer of (circular) muscles. 



known function. 

 inner ' 



a\ .glands, 

 chitinous outer wall of peduncle, 

 ment-duct 

 oi the main cement -duet. 

 initial cement-dui ts. 



c. stands for<larkly pigmented epithelium. 



Figs. 1-:!. Segmental organ of Scalpettum vulgare, Leach. 



Fig. 1. Transverse section of the body of Scalpellum vulgare, Leach, about the second 

 pair of maxilla' ; magnified 27 diameters. The band of connective tissue ( B) 

 ■ mitaius cceca of the testis. 



Fig. 2. Section of the segmental funnel ; magnified 305 diameters. 



Fig. 3. Section of the segmental organ ; magnified 10G diameters. 



Figs. 4, 5. Anatomy of the peduncle of Lepas cmatifera, Linn. 



Fig. 4. Transverse section near the upper extremity ; magnified s. 1 , diameters. 

 Fig. 5. Part of a section near the upper extremity : magnified 58 diameters. 



Figs. 0,7. 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 L 92 diameters. 



Fig. 7. Part of a section near the lower extremity ; magnified 33 diameters. 



Figs. - 11. Anatomy of the peduncle oi Scalpellum regium (Wyv. Thorns.). Eoek. 

 (The chitinous outer wall with the scales removed.) 



Fig. 8. Part of a section near the upper extremity ; magnified 8^ diameters. 



Fig. 9. Scciionat about 1 cm. from the upper extremity ; magnified 8^ diameters. 



Fig. L0. Section about half the length of the peduncle; magnified x. 1 , diameters. 



Fig. 11. Group of cement-glands in the upper extremity of the peduncle; magnified 58 



diameters. 



