BY JAS. P. HILL. 
9 
coelom (figs 4, 6, 7, 8, sp.) is related exactly as in the described 
species. It appears, in my preparations, when it comes to lie- 
directly on the sides of the proboscis gut as a deeply staining 
layer with dark staining nuclei in its middle region (fig. 7, sp.), 
the cell bodies of which are not recognisable. On the surface of 
the glomerulus it presents essentially the same appearance of a 
deeply staining granular layer with numerous dark staining nuclei 
on its inner face (fig. 6, sp.). 
On the outer side of the splanchnic epithelium there is a layer 
of tissue of a spongy appearance (figs. 6 and 7, ct.) which is 
directly continuous both above and below with the fine connective 
tissue of the proboscis coelom (fig. 4, ct.). This layer corresponds 
to the characteristic layer described by Spengel* on the surface 
of the glomerulus in Ft. sarniensis, and which he considers as 
the inner limiting layer of the connective tissue of the proboscis. 
Round the central proboscis organs there is always in sections, as 
in the described species, a space free from connective tissue and 
representing the proboscis coelom (figs. 5 and 8, pbc). Posteriorly 
towards the proboscis neck the proboscis coelom is divided, as in 
the other species, on the dorsal side through the heart bladder 
into two dorsal proboscis pockets (fig. 9, dp.), and on the ventral 
side through the ventral septum into two smaller ventral pro- 
boscis pockets (fig. 9, vp.). The ventral septum (figs. 3-5, 8, vps.) 
has in this species anterior and posterior free edges which run 
obliquely backwards, while its dorsal and ventral edges are 
attached to the proboscis gut and the outer wall of the proboscis 
respectively so that the septum is here four-sided and not 
triangular as in Ft. minuta. In its structure it is essentially 
similar to that of Ft. minuta. It consists of a central membrane 
carrying blood vessels, on either side of which there is a layer of 
muscle fibres — the ventral portion of the fibres of the dorso-ventral 
muscle plate; on the dorsal side, the fibres of the same plate can 
be distinctly recognised on the lateral walls of the heart bladder, 
below the splanchnic epithelium (figs. 3 and 5, dsc). 
Loc. cit. p. 101. 
