STEUCTUEE OF THE EXCUETOEY OEUANS OF AMPHIOXUS. 203 
EXPLANATION OF PLATES 11—16, 
Illustrating Mr. Edwin S. Goodrich’s paper “ On tlie Struc- 
ture of the Excretory Organs of Ainphioxiis.” 
PLATE 11. 
Fig. 1. — Diagnunniatic reconstruction of a left nephridiuui and the 
neighbouring lilood-vessels, from a series of sections taken parallel to 
the gill bar. The solenocytes are not represented. Side view from the 
outside. Op. indicates the position of the nephridiopore on the opposite 
side. 
Fig. 2. — Similar reconstruction of a right nephridiuui, fiom a series 
of sections transverse to the gill-bar. In two places the coilomic 
epithelium and the solenocytes are shown. 
Fig. 3. — Reconstruction of a portion of a left nephridium, the blood- 
vessels, and the toji of the secondary gill-l>ar, seen from behind. 
Fig. 4. — Small portion of a section shaving off the wall of a 
nephridial canal, and showing the bases of the solenocyte tubes 
embedded in the cytoplasm. Cam. Z. 2 mm. ap. oil imm., oc. 8. 
PLATE 12. 
Figs. 5 and 6. — Two consecutive sections, parallel to the gill-bar, 
through a nephildium, showing the solenocyte tubes xiassing through 
the thickness of the wall of the canal. Cam. Z. 2 mm. oc. 4. 
Fig. 7. — Drawing of the lower surface of the section of which the 
upper surface is represented in fig. (1. Cam. Z 2 mm. ap oil-imm., 
oc. 4. 
Fig. 8. — Section across the anterior limb of a nephridium, showing 
the ccelomic epithelium passing over the outer surface of the canal. 
Fig. 9. — Similar section showing solenocyte tubes piercing the wall 
of the canal. Cam. Z. 2 mm. ap. oil-imm., oc. 4. 
Fig. 10. — Section parallel to a gill-bar, cutting the wall of a diver- 
ticulum of the neiihridial canal (at th.). Cam. Z. 2 mm. ap. oil-imm., 
oc. 4. 
Fig. 11. — Diagi'amniatic view of a small portion of the wall of the 
diverticulum in the same section, showing the bases of the solenocyte 
tubes. 
