PLATE IV. 



I _■-. I ,. Anatomy of the male of Scalpellum regium (Wyv. Thorns.), Hoek. 



Fie. 1. Transverse section through a male of Scalpellum regium, which is in a young 

 stage; stomach filled almost entirely with nutritive yolk. 



Fig. -'. Section passing through the vesicula seminalis and a narrow portion of the 



testis. 



! .".. Section passing through a younger male at the level of the cement-eland.-. 



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. 



) 6. Muscular fibres ; magnified 575 diameters. 



Fig. 7. Supposed blood-corpuscles; magnified 575 diameters. 



Figs. Sa-Sf. Six oul of a series of transverse sections through the body of Scalpellum 

 calanoides, Hoek; magnified 41 diameters. 



Fig. 9. Fart of a section through the body of Scalpellum parallelogranvma, Hoek, atthe 

 base of the firsl pair of cirri ; magnified 26 diameters. 



Fig. 10. Part of a section through the body of Scalpellum nymphocola, Hoek ; magnified 

 41 diameters. 



