STUDIES ON EARTHWORMS. 301 
but often there is the appearance of a very delicate membrane separating one 
part from another of these cells. 4. is a cell which has emptied its granular 
contents. %.m. Basement membrane. co/. Columnar cells. cz. Cuticle. 
go. Goblet-cell. 2. Nucleus. zz. Nuclei of cells in a different layer. p. 
Pore of goblet-cell. 
Fic, 41.—A portion of a section through the modified epidermis of the 
clitellum, showing the two other varieties of cells beside the columnar (co/.) 
and the goblet-cells (g.). c/é. The club-shaped cells, filled with very minute 
granules, which are not very well represented. e¢. 2. Narrow elongated cells 
with similar contents to the ordinary goblet-cells. cap. Blood-vessel passing 
up between the columns of cells. c. ¢. Vertical strands of connective tissue 
separating the club-shaped cells into columns, and spreading out below them ; 
and also below the ordinary epidermic cells to form a network, in which the 
blood-vessels of this region lie. 
Fic. 42.—A_ portion of a section through the wall of the intestine. dv. 
The vascular network cut across. c.. vis. Visceral coelomic epithelium, with 
numerous yellow granules in the cells. c. ¢. Connective tissue round the 
muscles. gl. c. Gland-cells of the intestinal epithelium. zt. ep. Ciliated 
columnar cells of the epithelium. mus. circ. Circular muscular layer. mus. 1g. 
Longitudinal muscular layer. xz. Nuclei. w. Wall of blood-vessels. 
VOL. XXVI.—NEW SER. x 
