EXPLANATION OF PLATE XXXV. 

 Typhloperipaius willianisoni, Kemp. 



Fig. I. — Brain in dorsal view. The white matter is indicated as 

 a solid mass lying within the ganglionic substance 

 which is shown in partial transparency. 



,, 2. — Portion of a longitudinal horizontal section of the brain 

 passing through the antennary nerve {a.n.) and the 

 optic ganglion (o.g.). The optic nerve is expanded 

 within the ganglion, but is completely surrounded by 

 ganglionic cells. A loosel}' compacted structure within 

 the ganglion {r r.) apparently represents the remains 

 of the retinal rods. 



,, 3. — A foot in dorsal view. 



,, 4. — Lateral view of another foot. 



,, 5. — Lateral view of a renal gland from the ninth leg-bearing 

 somite, the coelomic end-sac indicated diagrammati- 

 cally. 



,, 6. — Anterior view of the same gland. 



,, 7. — A renal gland from the sixteenth leg-bearing somite of a 

 male, seen from in front. 



,, 8. — Crural and renal glands from the seventeenth leg-bearing 

 somite of a male in lateral view. 



J, 9. — Crural and renal glands from the sixteenth leg-bearing 

 somite of the same specimen in lateral view. 



,, 10. — Crural and renal glands of the three pregenital somites 



of another male, seen in lateral view, the nerve cord 



being indicated diagrammatically in the background. 



The somites are numbered in roman numerals (XV- 



XVII). 



Reference Letters. 



a.n., antennary nerve 



&., bladder. 



c.e.s., coelomic end sac. 



e.g., crural gland. 



c.t., coiled tube. 



d... duct. 



/., funnel. 



M.c, nerve cord. 



o.g., optic ganglion. 



o.n., optic nerve. 



r.g., renal gland. 



r.r., remains of retinal rods. 



