JOURNAL OF MICROSCOPICAL SCIENCE. 
EXPLANATION OF PLATES XXIV & XXV, 
Illustrating Mr. A. G. Bourne’s Memoir On the Struc- 
ture of the Nephridia of the Medicinal Leech.’’ 
References. 
L. B. V. Lateral blood-vessels. m.l. Cells of main lobe. a. l. Cells 
of apical lobe. t. l. Cells of testis lobe. c. n. Central duct. v. d. Vesi- 
cle duct. B. D. Recurrent duct. 
a. Nuclei. h. Blood-vessels. V. Empty blood-vessels. c. Cufcle 
of the blood-vessels. d. Muscular fibres. dJ . Circular muscular fib-es 
of lateral blood-vessels. J". Longitudinal, e. Cells of salivary gland, f li- 
different connective-tissue fibres. g. Pigmented vaso-fibrous connectivj 
tissue. h. Cilia in the vesicle. j. Opening of vesicle duct into vesicle 
k. Intracellular ductules. 1. Cuticle of ductules. m. Cuticle of cells. 
Fig. 1. — Semi-diagrammatic view of a segmental organ, taken from one 
of the right-hand series in the region of the testes. The blood-vessels 
are supposed to be injected, and the duct and ductules full. The con- 
nective tissue, which covers the organ and penetrates between the cells, 
and in which the blood-vessels lie, is not represented. 
Fig. 2. — Termination of the apical lobe (‘‘apex”) and a portion of the 
testis lobe, showing the origin of the recurrent duct, k. d. 
Fig. 3. — Surface view of cell from the apical lobe, with intracellular 
ductules, fully distended with fluid. 
Fig. 4. — Inner wall of the vesicle -y. opening of the vesicle duct ; 
h. blood-vessels ; h. cilia ; v. d. vesicle duct ; n. ridges due to the partially 
contracted state of the vesicle. 
Fig. 5. — Cells from the main lobe, with intracellular ductules fully 
distended. 
Fig. 6. — Cells of the apical lobe, as seen in transverse section 
h. blood-vessels ; c. cuticle of blood-vessels ; f. indifferent connective-tissue 
fibres ; k. intracellular ductules ; 1. cuticle of the ductules, x 800 
diams. 
Fig. 7. — Cells of the main lobe seen in section, letters as before. 
Fig. 8. — Cells surrounding recurrent duct in its free portion; — a. nu- 
cleus ; k. intracellular ductules ; /. cuticle of the ductules ; m. cuticle of 
the cells. 
