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Haswett—A Monograph of the Temnocephalee. 149 
EXPLANATION OF THE PLATES. 
PLATE x. 
1.—Integument and muscular layers of 7’. fasciata, from transverse section of a specimen fixed with 
Flemming’s chrom-osm-acetic solution. cw., cuticle; ¢.c., tactile cones; ep., epidermis ; b.m., 
basement-membrane ; c.m., circular layer of muscle; /.m., longitudinal layer of muscle ; p.m., 
dorsi-ventral muscular bundles of the parenchyma. The black veticulating lines are the 
pigment ; the lighter network the parenchyma. The spaces in the epidermis are here 
distinguishable, though small. The diagonal layer of muscle is not represented. 
2.—Integument of Z. fasciata, from a transverse section of a corrosive sublimate specimen. Letters 
as in preceding figure. The epidermis here appears perforated by vertical channels, which are 
not greatly dilated. The cuticle is somewhat diagrammatically represented. 
3.—Surface view of the epidermis of 7. fasciata, from a teased picrosulphuric acid specimen ; 
numerous large clear spaces in the protoplasm. 
4,—Tangential section through the epidermis of a specimen of 7. Nove-zealandie, fixed with 
Flemming’s solution. Throughout the protoplasm runs a system of branching and anasto- 
mosing fine canals, with here and there a rounded clear space. 
5.—From a tangential section of the integument of 7. fasciata, passing through the deeper part of 
the cuticle. ¢.¢., base of a tactile cone. 
6.—Surface view of the epidermis of 7’ fasciata, from a specimen prepared by means of Flemming’s 
solution, showing the minute elevations of the cuticle and a tactile cone—t.c. 
7.—Integument and body-wall of 7. Nove-zealandie, from a longitudinal section of a specimen 
prepared with Flemming’s solution. The epidermis here exhibits numerous channels with 
frequent dilatations. A little space here separates the epidermis from the basement-membrane. 
The muscular layers are merely indicated. The larger and smaller granules are the pigment. 
pa., parenchyma: other letters as in fig. 1. 
8.—Integument and body-wall of 7. Dendy?, from a longitudinal section of a specimen fixed with 
osmic acid. Letters as in fig. 1. The cuticle and epidermis are not here sharply differentiated ; 
the nuclei bulge downwards towards the basement-membrane. The basement-membrane 
exhibits a finely reticulate structure with occasional vertical lines apparently indicating the 
position of the pore-canals. 
9.—One of the nuclei of the parenchyma. 
10.—Group of problematical cells in parenchyma. 
11.—Excretory sac of 7. Nove-zealandic, from a living specimen. 0., external opening ; v., beginning 
of main vessel. 
. 12.—Capillary vessels ramifying in the wall of the excretory sac of 7. Dendyi. s., outline of suc; 
/.v., main longitudinal vessel. The capillary channels extend through the entire substance of 
the protoplasm of the sac; only a few of them are represented. 
13.—Section of the excretory sac of 7’. fasciata, from a longitudinal vertical section through a 
specimen prepared by Flemming’s method. c., central cavity of the sac ; m., investing layer 
of muscular fibres ; ca., narrow part of the central cavity of the sac. x 250. 
