224 Taenia elliptica 
branched processes, and with the parenchyma of the body and the dorso-ventral fibres 
by similar branched processes at their inner end ( s.c.t .). The dorso-ventral fibres are 
stretched straight, as are also the circular fibres, and are not distinguishable in 
appearance from the branched processes of the connective tissue parenchyma cells. 
The nuclear protoplasm of these fibres is apparently but slightly if at all differentiated 
from the fibre itself. The bundles of superficial longitudinal fibres ( s.l.f.) and those 
which lie deeper in the body ( l.f .) are swollen into masses in which no trace of a fibre 
is to be seen. 
The cuticle is seen separated from the basement membrane. (Corrosive and 
acetic,—Zeiss imm.) 
Fig. 3. The specimen was contracted dorso-ventrally and shows the dorso-ventral and 
circular fibres contracted into spirals. In this specimen these fibres are seen to be 
quite distinct from their nuclear protoplasm and of different, much more wiry, 
consistency than the delicate processes of the connective tissue cells. The dorso- 
ventral fibres are seen split up into two branches and then into four tendrils, and every 
portion of the fibre is seen to be capable of spiral contraction. 
Both groups of longitudinal fibres are sharply defined. In one place the superficial 
longitudinal fibres are seen to occupy a space between two of the cells of the outer 
layer of connective tissue, and in another place a bundle of the deeper lying longitudinal 
fibres is out of line with the rest: these irregularities I judge to be due to their 
displacement owing to the dorso-ventral contraction of the proglottis. 
The basement membrane is well shown and the superficial processes of the outer 
layer of connective tissue cells are seen in contact therewith. Owing to the 
longitudinal extension and dorso-ventral contraction of this proglottis, these latter 
cells are also contracted and much shorter than in fig. 2, and they are separated one 
from the other laterally. (Osmie acid,—Reichert ^ imm.) 
Fig. 4. The spiral contraction of a dorso-ventral fibre is well shown throughout its whole 
length ( d.v.f .), it is seen to pass through a bundle of longitudinal fibres. The 
differentiation of the fibre from the nuclear protoplasm of its cell is also clearly 
shown. (Osmic acid,—Reicherts imm.) 
Fig. 5. Showing attachment of superficial layer of connective tissue cells to basement 
membrane, and small bundles of superficial longitudinal contractile fibres within the 
spaces formed by the superficial branches of these cells. The cells are widely apart 
and are contracted (compare fig. 2). (Osmic acid,—Powell and Lealand jV imm.) 
REFERENCES. 
Ballowitz, E. (1891). Weitere Beobachtungen liber den feineren Bau der 
Saugethierspermatozoen. Zeitschr. f. wiss. Zool., Bd. lii. p. 217. 
Dendy, A. (1909). The Function of Reissner’s Fibre and the Ependymal Groove. 
Nature , Yol. lxxxii. p. 217. 
Haman-n, 0. (1885). Taenia lineata Goeze, eine Tanie mit flachenstandigen 
Geschlechtsoffnungen. Ein Beitrag zur Kenntnis der Bandwiirmer. Zeitschr. 
f. iviss. Zool., Bd. xlit. p. 718. 
Hertwig, R. (1880). Ueber den Bau der Ctenophora. Jenaische Zeitschrift, N.F., 
Bd. vu. p. 313. 
Moniez, R. (1881). Memoires sur les Cestodes, Pt. i. Paris. 
