



PLATE 



V. 





A. atanda for body-oavity. 





e. stands for darkly pigmented epithelium, 



a. „ 



outer layer of (longitudinal) muscles. 





in. 





, mtestme. 



B. 



band of connective tissue. 





M. 





, outer maxilla. 



6- 



second layer of (circular) muscles, 





m. 





, muscle masses. 



0. 



organ of unk^own function. 





n. 





, nerve cords. 



c. „ 



inner layer of (longitudinal) muscles. 





0. 





, ovarian cceca. 



C.gl. „ 



cement glands. 





od. 





, oviduct. 



Oh. 



chitinous outer wall of peduncle. 





t. 





, testis. 



D. 



main cement duct. 





s. 





, segmental organ. 



V-V" ,, 



branches of the main cement duct 





Sd 





, segmental duct. 



d. 



initial cement ducts. 





X. 





, (elastic) fibres of the connective tissue 



Figs. 1-3. Segmental organ of Scalpdlum vulgare. Leach. 



Fig. 1. 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. 



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



Fig. 3. Section of the segmental organ; magnified 106 diameters. 



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



Fig. 4. Transverse section near the upper extremity ; magnified 8^ 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. 



Figs. 8-11. Anatomy of the peduncle of Scalpellum, regium (Wyv. Thorns.), 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. 1 0. Section about half the length of the peduncle ; magnified 8 J diameters. 



Fig. 11. Group of cement glands in the upper extremity of the peduncle ; magnified 5§ 

 diameters, 



