Anatouiif nml UistoJorpj of a New Earthironn. 09 



The columnar epithelial cells with which the alimentary 

 canal is lined are, in a large part of the canal, indurated and 

 united at their inner ends, and in the middle division of the 

 intestine are densely and strongly ciliated. 



Nothing of interest can be added to the published 

 accounts of, the hypodermis in related worms. Numerous 

 gland cells of several forms occur with the more slender cells 

 which make up the bulk of the layer. Toward the anterior and 

 posterior extremities of the body the cells become gradually 

 longer, and thus approach in character the epithelium of the 

 stomodtEum and proctoda3um. 



Sense organs in the form of small clusters of fusiform 

 cells, bearing a close resemblance to the goblet-shaped organs 

 of the skin of fishes and amphibians, are very abundant in the 

 hypodermis about the ambulatory settC. 



Within the wall of the alimentary canal are developed ex- 

 tensive blood sinuses, the great extent of which was not sus- 

 pected before the wall was studied by sections. In the 

 large division of the intestine there is a considerable space 

 between the intestinal epithelium and the circular muscle layer, 

 which is filled with blood. Across this space stretch bands of 

 connective tissue from the epithelium to the muscle layer. 

 (PI. III., Fig. 14.) In the small anterior division of the 

 intestine, also, we find an extensive system of lacunae in which 

 the blood circulates, and is brought in contact with the lining 

 epithelium of the canal. (PI. III., Fig. 15.) It is in these 

 spaces, doubtless, that the blood receives the food material 

 secreted from the contents of the intestine. 



other arthropods. As seen in the above-named genus they lack the 

 connective tissue sheath so conspicuously developed in Diplocardia, 

 and owing to the more perfectly disparate character of the cortl there 

 is no place for a median fiber. They appear to be simply longitudinal 

 channels in the connective tissue, and represent, perliaps. the axial 

 part of the libers of earthworms. These channels contain, in pre- 

 served tissues, a residue in which, in addition to the minute granules 

 such as occur in the fibers of AUoIobophora, there are* scattered cor- 

 puscular bodies of larger size. 



