KONGL. SV. VET. AKADEMIENS HANDLINGAK. BAND 15. NIO 7. 45 



c = a bundle of spines, sliowing their relative size, number and form. 

 d = a single spine more enlarged. 



e = the front part of the nervous system seen from above. 

 / = the receptaole. 

 g = the efferent duct and the penis. 



h = perigastrie cells in different stages of development. The smallest resemble minute bodies, without 

 nueleus or cell-contents. 



PLATE V. 



Fig. 8. Arcliienchytrwus gemmatus n. sp. 

 a = the worm, nat. size. 



b = a bundle of spines showing their relative size, number and form. 

 c = a single spine more enlarged. 

 d = the supra-cesophagial ganglion seen from above. 

 e = the receptacle. 



/ = the efferent duct showing a bundle of spermatozoa at the top. 

 g = an egg from the ovary, entirely ripe. 

 h = two perigastrie cells. 

 h = a piece of the epidermis, showing its fenestration. 



Fig. 9. Archienchytrwus ochraceus n. sp. 



a = the front part of the worm, seen from the side. 



b = the hind part seen from above. 



c = a bundle of spines. 



d = the supra-cesophagial ganglion seen from above. 



e = the receptacle. 



/ = the receptacle from another individual; the form is slightly modified. 



g = the efferent duct. 



h = perigastrie cells, seen from the front and from the side. 



PLATE VI. 



Fig. 10. ArchienchytrcBiis nasutus n. sp. 



a = the worm, nat. size. 



b = the front part of the worm, seen from above. 



c = a single spine greatly magnified. 



d = the front part of the supra-cesophagial ganglion seen from above. 



e = the receptacle. The peculiar glandlike organs at the top, which I first mistook for real glands, are 

 perhaps nothing else than blood vessels broken and dyed by osmic acid or chloride of gold. 



/ = the efferent duct and penis. 



g = the vesiele of the efferent duct seen from the top, showing the interiör opening surrounded by a 

 wall of a nature not ascertained. 



h = eggs in different stages of development. 



Fig. 11. Archicnchytrceus ajfinis n. sp 



a = bundle of spines showing their relative size, number and form. 



b = a single spine magnified still further. 



c = the front part of the nervous system seen from above. 



d = the receptacle, partly represented as seen inoptical section. 



e = the receptacle from another individual, the vesiele being more eularged in the middle. 



f = the efferent duct and penis. 



g = the vesiele of the efferent duct from another individual, showing a slight variation in form. 



PLATE VII. 



Fig. 12. Arcliienchytrwus profugus n. sp. 

 a = the worm, nat. size. 

 b = the front part of the nervous system as seen from above. 



