PLATE III. 



Fig. 1. Carinina grata, n. gen. et sp. Longitudinal section through a loop of the proboscis. In the 

 upper section the proboscidian epithelium {Pe) is much more columnar, in the lower one 

 it is thrown into folds and much more loosely applied against the musculature. 



Fig. 2. Carinina grata, n. gen. et sp. A part of the last mentioned region, more considerably enlarged. 



Fig. 3. Cariniim grata, n. gen. et sp. A longitudinal section through the body-wall. Cm, the inner 

 circular muscular layer (8 of PI. XI.); LM, the longitudinal muscles (a of PI. XI.); ec, the 

 outer ^circular muscular layer (/J of PL XL); B, the homogeneous basement membrane ; Nl, 

 the deepest layer of the integument, with plexiform nerve tissue (the lithographer has given 

 too stellate an appearance to these histological elements); Gi, the deeper glandular stratum ; 

 E, the outer stratum of the integument. 



Fig. 4. Carinina grata, n. gen. et s,\). The same, in a region where the gland-cells of the glandular 

 stratum are all considerably reduced and the basement membrane contracted into waves. 

 The nervous plexus is not indicated in tliis figure. Lettering as in fig. 3. 



Fig. 5. Carinina grata, n. gen. et sp. A horizontal section through the point of insertion of the pro- 

 boscis in the head. The cellular integument is coloured red. M, the musculature, chiefly 

 longitudinal, from which fibres emerge to pass backwards into the musculatui'e of the proboscis, 

 the epithelium of which is marked Pe. Other radial fibres attach the rhynchodeeuni in the 

 head, the cellular coating of which {APe) is thicker and more vacuolated than that of the pro- 

 boscis. Bl (upper), blood-space in the head ; Bl (lower), space of proboscidian sheath ; rf, 

 cephalic furrow. 



Fig. 6. Carinina grata, n. gen. et sp. More enlarged figure of a transverse section of the body-muscu- 

 lature. Lettering as in fig. 3. Moreover, d, hyaline gelatinous tissue between the muscidar 

 bundles, carrying nuclei. Other nuclei are detected in the centre of the muscle bundles. 

 To the left of the layer Cm there is a faint iudication of what is possibly a second internal 

 layer of plexiform nerve-tissue. 



Fig. 7. Carinina grata, n. gen. et sp. Enlarged figure of a transverse section of the lateral nerve-stem. 

 Nst, the fibrous core with sparse nuclei ; Nge, the cellular investment of the stem, continued 

 into Nl, the nerve plexus, all three stiU forming part of the deeper layers of the integument, 

 which by the basement layer B (not passing over the nerve-stem) is separated from the 

 subjacent muscular layers (ec); (H, the deeper gland-cells of the integument. The nerve-trunk 

 is attached by fibres' binding it down to the muscular layers. 



Fig. 8. Carinina grata, n. gen. et sp. The same in tangential section. Lettering as in the preceding figure. 

 The attaching fibres are seen to be not continuous but arranged in closely set bundles. The 

 integumentary gland-cells show different colours in the left and in the right half of the 

 section ; in the intervening region they are not developed ; this would thus correspond to 

 such a region as is represented in fig. 4 in longitudinal section. 



