D. C. Danielssen. 
[No. i. 
Fig. 6. The digestive apparatus, dissected longitudinally : magni- 
fied. a. The oesophageal folds. b. The intestinal folds, 
c. The folds of the rectum. 
» 7. Guilet-tube, intestine, oral disc, and tentacles: magnified. 
a. The gullet-tube. b. The intestine. c. Rectum. d. Septal 
insertion. e. Fissures of the rectum. f. Ovaries. 
» 8. Transverse section of the integument of the body. a. Ec- 
todermal cylinder-cells. b. Mucous glands, c. Nemato- 
cysts. d. Connective-tissue. e. Circular muscles. f. Lon- 
gitudinal and transversal muscles. g. Endothelium. 
» 9. Portion of an ovary detached from the septum: magni- 
fied. a. Connective-tissue. b. Pedunculated ovarian cap- 
sule. c. Ovum. 
» 10. Portion of a testicle, magnified. 
Plate IIL 
» 1. Transverse section of integument and intestine of Ægir 
frigidus, magnified. a. Connective-tissue prolongations is- 
suing from the septum. b. Longitudinal muscles attached 
to those prolongations. c. Longitudinal muscles on both 
sides of the septum, forming tufts. d. Connective-tissue 
prolongation issuing from the outer wall of the intestine. 
e. Epithelium of the same. f. An epithelial connective- 
tissue prolongation, divided bifurcately. g. Connective- 
tissue prolongation issuing from the inner wall of the in- 
testine, forming an intestinal fold. h. Epithelial covering 
of the same. 
» 2. Transverse section of the posterior part of the body of 
Ægir frigidus; showing the integument, septa, and in- 
testine, in vvhose cavity excrementa are seen: magnified. 
a. A chamber. b. The fillet-formed connective-tissue pro- 
longations from the outer wall of the intestine. 
