OP A SILUEOID; S. HIROTA. 379 



Expianalion of Plate XXXVI. 



Abla-eviatious: J, arteries ; cap., capillaries; 7>/))-., pits ; (7/., glandular cells; 

 Goh., Goblet cells ; SI, slime cells; u. fj. p., nrogeiiital papilla ; 1', veins. 

 Fig. 1. Gênerai view of the dendritic appendage and its adjacent parts. Kat. size. 

 Fi<j. 2. Represents the amis, the urogenital papilla, and the depression of the body 



into which the dendritic appendage is received, together with the stalk of 



the appendage cut at its base, thus exposing the collar and the central pit 



(fissure) at the bottom of the depression, x 2.7. 

 Fiij. S-5. Eepresent respectively the dorso-ventral, the ventral, and the dorsal, 



views of the dendritic appendage. The stalk is cut off at about its 



middle, x 2.7. 

 Fifi. 6. Surface view of a lobe or leaf of the appendage under a magnifying lens 



Black spots represent pits, x 9. 

 Fig. 7. Surface view of a part of a lobe. Eed lines represent capillaries and black 



areas pits. Highly magnified. 

 Fiij. 8. Young Flotosus. Its dendritic appendage is represented in Fig. 9. Nat. 



size. 

 Fig. 9. Dendritic appendage of a yound Plotosiis represented in Fig. 8. Fine 



black spots on the surface represent pigment, x 18. 

 Fig. 10. Represents diagrammatically the origin of blood-vessels (red lines) and of 



nerves (black line) which enter the dendritic appendage. An artery and 



a nerve on the opposite side are not represented. 

 Fig. 11. Surface view of a lobe, seen under a magnifying lens ])y transmitted light, 



showing blood-vessels. 

 Fig. 12. Transverse section of the stalk of the very young dendritic appendage 



shown in Fig. 9. The peripheral light area represents the cortex, the red 



rings arteries and the vein, and the light black ring the lymph-cavity. 

 Fig. 13-16. Selected transverse sections of the stalk. Fig. 13 is taken from that 



portion of the stalk where it is adherent to the urogenital papilla and 



Fig. 16 from the level where the appendage is bifurcated. There are 114 



sections between Fig. 13 and 14, 89 between Figs. 14 and 15, and 55 



between Figs. 15 and 10. Eed and light black rings represent the same 



structures as in Fig. 12. Black dots represent nerve-bundles. Zeiss 2.aa. 



