STRUCTURE OE UROOH^ITA AND DICHOGASTER. 281 
EXPLANATION OF PLATES XXIII & XXIV, 
Illustrating Mr. Frank E. Beddard’s paper “ On Certain 
Points in the Structure of Urochaeta, E. P., and Diclio- 
g aster, n. g., with further Remarks on the Nephridia 
of Earthworms.” 
PLATE XXIII. 
Fig. 1. — Semi-diagrammatic longitudinal section through anterior extremity 
of Urochaeta corethrura. The aperture of the mucous gland at o is 
correctly drawn as regards its position relative to the setae, but it should be 
more ventral in position, n. Ventral nerve-cord, f Funnels of mucous 
gland (3). g. Gizzard, s. Setae, c. Supra-cesophageal ganglion, al. Cavity 
of anterior end of the alimentary tract. 
Fig. 2. — Longitudinal section through genital segments of the same species. 
The vesiculae seminales are not represented, t. Testis, o. Ovary, ov. Ovi- 
duct pore. v. d. Vas deferens. The segments are numbered. 
Figs. 3 and 4. — Contents of genital glands of the same specimen. Both 
testes and ovaries have produced ova in this individual. 
Fig. 5. — A funnel of the mucous gland of Urochaeta. 
Fig. G. — Transverse section through body wall ofDichogaster Damonis. 
e. Epidermis, m. Circular muscles. 1. Longitudinal muscles, p. Peritoneum. 
Fig. 7. — Dichogaster. Segments in the neighbourhood of the male 
reproductive pores, v. d. Vasa deferentia. pr. Atria, pr 1 . Glands in 18th 
and 19th segments, similar in structure to the atria, but unconnected with 
the vasa deferentia. 
Fig. 8. — Dichogaster. Ventral external view of segments in the neigh- 
bourhood of the male reproductive pores, to show pores upon the 17th, 18th, 
and 19th segments. 
Fig. 9. — Fragment of nephridium of ditto, with glandular peritoneal 
cells («). 
Fig. 10. — Perichseta aspergillum. Nephridial funnels, u smaller, b 
larger. In a one of the two funnels, that to the right, is seen in longitudinal 
section. 
Fig. 11. — Perichseta armata. Large nephridia of posterior segments. 
a. From a glycerine preparation, which showed very clearly the boundaries 
between the successive “drain-pipe” cells. 
