292 Henry Leslie Osborn, Loxogenes arcanum Nickerson. 



Fio". 7. From a section passing in the plane of the surface and 

 cysting the spines transversely, GiLSON, etc. as in Fig. 6. 



Fig. 8. View of the papillae and spines of the ejaculatory duct, 

 region of d,j in Fig. 5. On the left the prostate cells and muscles of 

 cirrus sack are shown, scale as before. 600: 1. 



Fig. 9. Section from a transverse series, in the level of the ventral 

 sucker of pyloric cyst worm, to show the spines in the cuticle of the 

 cavity of the sucker, the well developed radial musculatur and the deposits 

 in the parenchyma cells. ZEISS 2 D, scale 0,01 ram. 200: 1. 



Fig. 10. A narrow strip across a transverse section from a worm 

 from the frog's urinary bladder, to show the concentration of the sub- 

 cuticular cells at the surface, and their scarcity in the deeper parenchyma, 

 scale 0,01 mm. 40 : 1. 



Fig. 11. Cuticula and underlying cells from section from worm from 

 frog's bladder showing the resting stage of the sub-cuticular cells and one 

 of the ordinary parenchyma cells, GiLSON, Iron-haemat. Cam. Luc, oil- 

 immersion, scale 0,01 mm. 600 : 1. 



Figs. 12 — 16. Views of different sub-cuticular cells all from longi- 

 tudinal sections of pyloric cyst specimens, technique etc. same as in 10, 

 scale 0,01 mm. 600 : 1. 



G. Pätz'sche Buchdr. Lippert & Co. G. m. b. H., Naumburg a. d. S. 



