464 E. A. MINCHIN ON THE RAT-FLEA, CERATOPHYLLUS FASCIATUS. 



seen, less clearly ; close to ax. is a spiral muscle, sp.m. ; between 

 sp.m. and d. is a cushion of cells with nuclei, apparently glandular 

 in nature. x 350. 



B, a portion of one of the prostatic tubules, in surface view, 

 showing an epithelium composed of glandular cells with very 

 distinct polygonal outlines, x 350. 



Plate 31. 

 Accessory Reproductive Apparatus of the Female Rat-flea. 



U.S., receptaculum seminis ; m.r.s., muscles connecting the 

 main chamber of the receptaculum with its horn-shaped pro- 

 longation ; gl.c, cushion of gland-cells surrounding the duct at 

 the point where it issues from the receptaculum ; d., d., d., the 

 long coiled duct of the receptaculum, seen here forcibly uncoiled; 

 gl., gland-cells, thickly crowded on the proximal part of the duct; 

 T.O., terminal organ; c.b., bar of thickened chitin on the wall of 

 the termination of the duct; m.t.o., "bowstring" muscle of 

 the terminal organ. The apparatus is seen at a magnification 

 of 200 linear ; at A and B are seen portions of the duct magnified 

 400 linear. 



Plate 32. 



Stellate Muscle -cells of the Oesophagus of the Flea 

 and the Crop of the House-fly. 



A, oesophagus of the flea, magnified -- /-- linear, showing the 

 muscular network; B, a detail of A, magnified 1,000 ; C, a detail 

 from another specimen, magnified 1,000, showing how the striated 

 muscle-fibres are continued through the cytoplasm of the muscle- 

 cells. 



D and E, muscular network from two different regions of the 

 crop of the house-fly ; both from the same specimen, and 

 magnified to the same degree as A. 



Lister Institute, 



January 'Z5th, 1915. 



Journ. Qvekett Microscopical Club, Ser. 2, Vol. XII., No. 70, April 1915. 



