PLATE IV 



The basement membrane and the iieijhridial apparatus are on this plate indicated by a red tint. 



Fig. 1. Cariniita '/rata, n. gen. et sp. A longitudinal section through the body-wall at the point where 

 the terminal duct of the nephridia (iVc) pierces it. LM and er, muscular layers (see PI. III. 

 figs. 3, 4); 7?,basement membrane ; £, cellular integument, with superficial and deeper 

 gland-cells, separated by a layer of closely contiguous nuclei that belong to extremely 

 elongated cells, placed perpendicularly to the surface. 



Fig 2. Carinina ijraia, u. gen. et sp. Section through a region where the nephridial canal (Nc) is still 

 enclosed in the blood-space {Bs) in which a distinct cellular coating is observable, and 

 which is separated from the intestinal caeca {Jc) by the inner circular muscular layer {cf., 

 Cm, figs. 5, 6); LM, the outer longitudinal muscular layer. 



Fig. 3. rV(?'iM«Ha yrate, n. gen. et sp. A longitudinal section through the (esophagus (Oe). Jc, its ciliated 

 epithelium directly a]:iplied ujioti the nuiscular layers Cm, LM, and fc (see PI. III. fig. 3); 

 PSW, the proboscidian sheath-wall, very thin, Avith the oesophageal epithelium below 

 and its own nuclei above it. This fibrous wall is confluent superiorly with the layer of 

 circular muscles Cm {cf. PI. II. figs. 5, 9, 10). 



Fig. 4. Carinina ijra/a, n. gen. et sp. Section through the spongy and canalicular part of the nephridium 

 (N'sp), and the region where it communicates with the principal nephridial duct iVr ; Bf, Jr, 

 LM, and Cm, as in the preceding figures. 



Figs. 5, G. Carininii. grata, n. gen. et sp. Transverse sections of the same system. The nephridia He in 

 the blood-spaces {Bs) which have their own cellular coating, and are partly enclosed in the 

 circular muscular layer Cm. Ps and Oe indicate the respective situation of proboscidian 

 sheath and ossophagus in relation to the nephridia ; Nsp and Nc as in fig. 4. 



Fig. 7. Ctirhiina (jrata, n. gen. et ^\). A portion of the oesophageal epithelium under higher power. Je, 

 the granular epithelium cells; c, the cuticula with the cilia. 



