662 PROCEEDINGS OF THE ACADEMY OF [Dec. , 



brotul at the free distal eiuls where the cilia are borne, and taper- 

 ing proxinmlly to a slender stalk, st., which constitutes about two- 

 thirds of the length. In fig, 15, drawn from a sublimate prepara- 

 tion, the stalk is somewhat shrunken and appears less than half 

 the length of the expanded distal part; in fig. 14, a Flemming's 

 fluid preparation, the stalks are relatively longer, and probably 

 more as they appear in life. The oval nucleus, N., lies in the 

 tapering part of the cell, just above the stalk. The chromatin 

 forms a prominent reticulum. 



The cilia, CiL, are about as long as the expanded distal part of 

 the cell. Each cilium is composed of several parts. The basal 

 knob, fig. 14, b.k., rests on the distal surface of the cell, and is 

 connected by a fine thread with a second smaller granule, the 

 upper knob, u.k., which bears the terminal hair of the cilium. 

 The cilium is continued into the cytoplasm by a line of very fine 

 granules, fig. 14, x., which seem to reach the nucleus. This, 

 however, can only be seen with a very high magnification. 



The gland cells are abundant in the body epithelium, and are 

 uniformly distributed throughout the body. Two types may be 

 distinguished, in the first the secretion stains with eosin, fig. 2, 

 Gl.i, in the second with hsematoxylin, fig. 2, Gl... In both types 

 a delicate cell membrane is present, the nucleus is small and lies at 

 the base of the cell embedded in cytoplasm. The relative amounts 

 of cytoplasm and secretion depend upon the phase of the cell. 

 In fig. 2 the blue- staining cell on the left contains less secretion 

 and more cytoplasm, and is therefore in an earlier phase than the 

 blue-staining cell to the right. In like manner, the red-staining 

 cell on the right of the figure contains less secretion and is in an 

 earlier stage than the red-staining cell on the left. The red-staining 

 secretion is homogeneous, evidently fluid or viscous ; the blue- 

 staining secretion apparently contains flaky masses within a fluid. 

 The latter cells are more apt to assume the flask-like shape, the 

 former are oftener rod- shaped. Cells are frequently found with 

 the secretion entirely discharged from the delicate cell membrane, 

 the nucleus remaining at the base. 



The basement layer, fig. 2, B.L., separates the epithelial cells 

 from the underlying musculature. It is not a true basement mem- 

 brane, being not the product of the bases of the epithelial cells, 

 but a formation from the interlacing fibres of connective tissue 



