BT W. A. HASWELL. 343 



Figs. 4 and 5. Views of extremity of pedipalpi ( y 525). 



Fig. 6. Fourth leg. 



Fig. 7. Extremity of leg ( y 525). 



Fig. 8. Approximately sagittal section of capitulum ('><'225). 



Fig. 9. Transverse section of the capitulum passing through tlie bridge and 

 the salivary receptacle Cx 225). 



Fig. 10. Semi-diagrammatic outline of the nerve-mass, the anti-coagulin gland 

 of the left side, and adjoining parts. The dorsal salivary gland and the main duct 

 are indicated by the broken lines, the main salivary duct by the dotted lines. 



Plate xxxvii. 



Fig. 11. Transverse sections of capitulum behind the middle part of the 

 bridge (x 225). 



Fig. 12. Similar section a little further back. 



Fig. 13. Section of dorsal salivary gland from a transverse series. 



Fig. 14. Transverse section of the right enteric caecum and the adjacent 

 median excretory organ. The shaded body in the interior of the former represents 

 the mass of crayfish blood with the channels excavated in it. The details of the 

 boundaries of the cells in this and the two following figures are not given. 



Fig. 15. Transverse section of young animal without any full-grown ova and 

 the uterus empty. The blood filling the enteric caeca is not represented : the in- 

 tegument is indicated by a single line. The uterine partition has disappeared in 

 the region represented. 



Fig. 16. Similar sections of a mature specimen with the uterus distended with 

 ripe eggs, one only of which is represented (x 40). 



Fig. 17. Portion of a section through the ovary, showing various stages in the 

 development of the stalked ova, the "yoUc-nucleus," and its replacement in the 

 largest ovum by the yoUc spherules (x 525). 



Fig. 18. Genital aperture, genital suckers and excretory aperture (x 120). 



