PLATE VI. 



Fig. 1. Carinina grata, n. gen. et sp. The brain as situated in the deeper strata of the integument, 

 seen in horizontal section (cf. woodcut fig. 5, p. 81). Br, Br, the anterior and the posterior 

 brain-lobes. The inner fibrous core of these lobes white ; in the anterior lobe traversed by 

 radial fibres, in the posterior one containing the ciliated canal ec, that opens out in fig. 2 into 

 the cephalic groove Cg ; Ngc, the nerve-cells of the brain-lobes (stretching outwards as far as 

 the red tint is applied in the figure); <jl.br, glandular cells connected with them; E, the 

 outer layer of the integument ; 6-7, the deeper one with gland-cells ; ec and LM, muscular 

 layers ; bs, blood-lacuna between the oesophagus and the muscular body-wall ; Oe, lumen, 

 Ie, epithelium of oesophagus ; Nv, branches of the so-called vagus nerve. 



Figs. 2, 3. Carinina grata, n. gen. et sp. The posterior brain-lobe in following and preceding sections. 

 Lettering as in fig. 1. 



In all these three figures a marked increase of the nuclei in the immediate vicinity of the 

 cephalic groove is particularly distinct. 



Figs. 4-8. Eupolia giardii, n. sp. Transverse sections through different parts of the brain. Com- 

 pare the figures on PI. V. The fibrous core white, the nerve-cellular coating light red. 



Fig. 4. Section through the lower commissure, just in frout of the upper commissure. TV, proboscis, the 

 innervation of which, proceeding from the two brain-lobes, is noticed in this section (cf. PI V 

 figs. 5, 9). 



Fig. 5. Section through both commissures, i.e., a few sections further back. 



Fig. 6. A few sections still further back, through the point of origin of the vagus nerve (Nv). Prs, 

 anterior terminal portion of the proboscidian sheath. 



Fig. 7. Section through superior, inferior and posterior lobe : the latter coated by the granular glandular 

 cells gl.br, and with the ciliated canal cc. 



Fig. 8. In the superior lobe the fibrous core has again subdivided, giving off an uppermost stem, the 

 centre of the outwardly visible superior gyrus (cf. PI. V. figs. 5, 7). 



Fig. 9. Eupolia giardii; n. sp. Part of a transverse section through the oesophageal region. 

 cm and Ilm, the circular and inner longitudinal muscular layer (/3 and a of PL XI. fig. 12); 

 PI, the nerve plexus just outside the former ; Nst, the lateral nerve-stem in this plexus ; 

 Prs, the proboscidian sheath with very thin walls ; dv, the dorsal blood-vessel, situated, as 

 are a dozen of circumcesophageal lacunar spaces (that communicate with each other), in the 

 gelatinous tissue between body-wall and intestinal wall. Oe, the lumen of the oesophagus ; 

 Ie, its ciliated epithelium ; oe.m, its longitudinal and circular musculature ; nep, nephridian 

 tubes. The thin longitudinal nerve-stem above the proboscidian sheath has been omitted 

 in this figure. 



Fig. 10. Eupolia giardii, n. sp. A transverse section of the dorso-median portion of the body- wall 

 at the furthest end of the body. em, ilm, Prs, as in fig. 9. olm, outer longitudinal 

 muscular layer (y, PI. XI.); Bet, the much folded primary basement layer ; g, the deeper 

 glandular layer of the integument ; ef, the longitudinal and circular fibres of the same ; 

 E. the outer layer of the integument (ef. PI. VII. fig. 5 and PL X. fig. 6) ; ov, dorsal 

 blood-vesseL 



Fig. 11. Eupolia _ giardii, n. sp. Transverse section through the posterior part of the proboscis, 

 with internal epithelium (Pre), longitudinal muscle-fibres (Lm), and external flattened epi- 

 thelium (<■). 



