GEROULD. — Caudina. 
=I 
to 
PLATE 5. 
For abbreviations see Explanation of Plates, p. 75. 
Cross section through the pharynx, showing the inner epithelium. 
< 500. 
Cross section through the stomach showing inner epithelium and 
connective tissue. x 500. 
Cross section through the stomach of Cucumaria frondosa. X 40. 
Longitudinal section through the wall of the small intestine of 
Caudina. xX 500. 
Cell from the inner epithelium of small intestine. Maceration prepa- 
ration. x 500. 
Peritoneal epithelium from the wall of the stomach. X 280. 
Epithelium from the mesentery of the intestine. Silver-nitrate prepa- 
ration. x 280. 
Section of the wall of the respiratory tree. Xx 420. 
Peritoneal epithelium from the respiratory tree. X 280. 
Brown spheruliferous corpuscle from the large intestine. 500. 
Cross section of large intestine showing external longitudinal muscle 
bands. x 24. 
Section through the inner epithelium of the cloaca. X 280. 
Connective-tissue cell from the mesentery of the small intestine. 
« 500. 
Interradial plate of calcareous ring; a, external; b, internal face. 
Radial plate: a, edge view; b. exterior view; c, viewed from within 
the calcareous ring. 
Aquapharyngeal bulb seen from the left side. X 2. 
Diagram of the branches of the median-ventral radial water canal 
to the tentacles. View from within the aquapharyngeal bulb. 
Branches graphically reconstructed from a series of sections. 
Posterior face of a cross section through aquapharyngeal bulb show- 
ing the openings of the radial canals into the circular canal. 
Posterior face of a section through the aquapharyngeal bulb, further 
forward than the last. 
Similar view of a section still further forward, where the radial and 
interradial plates form a continuous ring. 
Portion of posterior face of a cross section further forward showing 
the opening of the two lateral branches of the median-ventral canal 
into the tentacles. 
Portion of posterior face of cross section showing the origin, from 
the radial canal, of the tentacular canal (ag. ta.’) which unites with 
the adjacent (median-ventral) tentacle. In this case the tentacular 
branch arises on the left side of the radial canal. 
