432 
1900 SARGENT, Reissner’s Fibre in the canalis centralis of Vertebrates. 
Anat. Anz., Bd. 17. 
1901 —, The Development and Function of Reısswer’s Fibre, and its 
cellular connections. Proc. Amer. Acad., Arts and Sc., Vol. 36. 
1904 —, The Optic Reflex Apparatus of Vertebrates for Short-circuit 
Transmission of Motor reflexes through Reıssner’s Fibre; its 
Morphology, Ontogeny, Phylogeny and Function. Bull. Mus. Comp. 
Zool., Harvard, Vol. 45. 
1868 StıEDA, Studien über das zentrale Nervensystem der Knochenfische. 
Zeitschr. f. wiss. Zool., Bd. 18. 
1899 Stupniéxka, Der Reıssnersche Faden aus dem Zentralkanal des 
Rückenmarkes und sein Verhalten in dem Ventriculus (Sinus) 
terminalis. Sitzungsber. Böhm. Gesellsch. Wiss., Math.-naturw. Kl., 
No. 36. 
1900 —, Untersuchungen über den Bau des Ependyms der nervösen 
Zentralorgane. Anat. Hefte, Bd. 15. 
Description of Plates I and II. 
(All the figures are reproduced from photomicrographs of actual sections.) 
Fig. 1. Gasterosteus aculeatus. Part of a sagittal section through the tail of a 
24 mm. specimen, showing the filum terminale projecting freely between the fin rays 
for some distance beyond the end of the vertebral column. 50. 
Fig. 2. Gasterosteus aculeatus. The filum terminale of the preceding figure more 
highly magnified. In this, REISSNER’s fibre may be seen passing from the canalis cen- 
tralis into the sinus terminalis and there ending in the terminal plug. XX 350. 
Fig. 3. Rhina squatina. A tangled heap of REISSNER’s fibre from the filum 
terminale. X 225. 
Fig. 4. Raja blanda. Part of a sagittal section through the tip of the tail show- 
ing the canalis centralis widening out into the sinus terminalis, in which are pieces of 
a coiled mass of REISSNER’s fibre. X 50. 
Fig. 5. Raja blanda. The sinus terminalis of the preceding figure more highly 
magnified. X 150. 
Fig. 6. Seyllium canicula. Part of a sagittal section through the spinal cord 
showing REISSNER’s fibre spirally coiled lying in the canalis centralis. X 135. 
Fig. 7. Raja blanda. Part of a sagittal section through the spinal cord showing 
REISSNER’s fibre still more coiled, in the canalis centralis, at a point in front of the 
experimental incision. X 150. 
Fig. 8. Raja blanda. Part of another sagittal section through the spinal cord of 
the same specimen showing REISSNER’s fibre strongly twisted at a point some distance 
behind that of the preceding figure. X 300. 
Fig. 9. Raja blanda. Another part of the same section as that from which the 
preceding figure was taken. REISSNER’s fibre is seen strongly coiled, the plane of the 
section at this spot passing through the long axis of the coil. X 300. 
Fig. 10. Raja blanda. Part of an oblique sagittal section through the spinal 
cord of another specimen (10) at a point about 10 mm. in front of the point of ex- 
perimental lesion. REISSNER’s fibre seen in a loose tangle. 175. 
Fig. 11. Seyllium eanicula. Sagittal section through the filum terminale of 
specimen (F) almost at its extremity. The sinus terminalis has been removed by some 
accident in life and REISSNER’s fibre is seen lying freely in gently undulating course 
in the canalis centralis. X 180. 
Explanation of lettering. 
c.c. eanalis centralis. ep. ependyma. j.7r. fin rays. f.t. filum terminale. hyp. 
hypural bones. R.f. REISSNER’s fibre. s.t. sinus terminalis. ¢.p. terminal plug. 
