150 Macueay Memortat VoLume. 
Fig. 14.--Section of the excretory sac of 7. fasciata, from a longitudinal section of a specimen prepared 
by Flemming’s method. The section does not pass through the central cavity, but is selected 
because it shows the continuity of the protoplasm of the narrow end of the sac and beginning 
of the main canal with that of the wall of the main portion of the former. ca., lumen of 
commencement of main canal; nw., the two nuclei. The nuclei are not divided through the 
middle, but near the periphery, so that their relative size is not shown. 
Fig. 15.—A small part of the section represented in fig. 13, showing the minute structure of the wall of 
the sac with some of the capillaries. x about 2000. 
Fig. 16.—A longitudinal section through one of the larger excretory vessels of 7’. fasciata, showing the 
nucleus of one of the perforated cells. From a series of longitudinal sections x 500. The 
double border of the canal is due to an error of the lithographer. 
Figs. 17 and 18.—Two successive longitudinal sections through the basal part of a tentacle of 7. Dendy, 
showing perforated cell with the twisted tentacular main vessel and portions of branches. 
PLATE Xt. 
Fig. 1.—General view of the arrangement of the principal excretory vessels in Temnocephala Nove- 
zealandic. t.s., terminal sac; ph., pharynx ; 7., intestine ; #.t.t.¢., testes ; s., sucker. 
Fig. 2.—Excretory cell of 7. fasciata, section of central part to show nucleus and capillary channels. 
Fig. 3.—Excretory cell with branch vessel entering it and breaking up into capillaries. 
Fig. 4.—Unipolar ganglion-cell, highly magnified. 
Fig. 5.—Section through the brain of 7. Dendyi, from a series of horizontal sections of the animal, 
i 
showing the transverse curved band of fibrous material and some of the ganglion-cells. ph.., 
pharynx. 
Fig. 6.—Eyes of Z. Dendyi, from a series of horizontal sections. p.c., pigment-cups; 7.b., vefractive 
bodies, seen also projecting through the bases of the cups ; c., cells similar to nerve-cells, closely 
applied to the refractive bodies; «., large non-nervous cells; .c., nerve-cells. 
Fig. 7.—Eye and brain of 7’. fasciata, from a series of vertical longitudinal sections. p.c., pigment-cup ; 
7.b., contained refractive body ; c., one of the cells similar to nerve-cells closely applied to the 
mouth of the cup; 7.c., retinal cells ; f, central fibrous mass of brain. 
Fig. 8.—Approximately median section of the brain of 7’. fasciata, from a series of vertical longitudinal 
sections of the animal, to show the arrangement of the large channels, ch., with their contents, 
and the fibrous mass, f. ph., pharynx; pr., bands of parenchyma muscle which act as the 
protractors of the pharynx ; 7., position of the integument of the dorsal surface ; ph., pharynx ; 
ch’., detached group of channels and fibres. 
Fig. 9,—Eye and neighbouring parts in 7’. fasciata, from a series of horizontal sections. p.c., pigment-cup ; 
7.., refractive body ; 7.c., “retinal” cells ; x.’., problematical cells, which are always symmetri- 
cally arranged in this region ; the nuclei are not mesially divided ; «”., nucleus of a similar cell. 
The rest of the cells represented are ganglion-cells. The brown spots are dorsi-ventral bands 
of parenchyma muscle, many of them perforating the large cells. The irregular network of 
dark lines continuous with the pigment of the eye are the strands of pigment in the paren- 
chyma. 
