W <»• o- SA *s- [No. 8. 



Fig. 2. Eight valve of same specimen, viewed from the inner 

 face, exhibiting the testicular tubes in situ. 

 „ 3. Marginal part from anterior extremity of same valve, 



magnified 120 diameters. 

 „ 4. Right maxilla of 2nd pair, magnified 120 diameters. 

 „ 5. Left maxilla of 2nd pair. 



„ 6. Eight copulative organ (c) together with the corre- 



responding vas deferens (v) and ejaculatory tube (x), 



viewed laterally. 

 „ 7. Both copulative organs, expanded and viewed from 



the upper face, magnified 160 diameters. 

 n 8- Upper extremity of an ejaculatory tube, showing the 



coronula, end view; magnified 390 diameters. 

 » 9. Portion of the ejaculatory tube, containing 5 segments, 



lateral view; same enlargement. 

 » 10. Extremity of a testicular tube from a specimen quite 



young, showing the regularly disposed spermato- 



cysts; magnified 160 diameters. 

 » 11. Spermatocysts from the testicular tubes of an adult 



male; same enlargement. 

 n 12. Posterior extremity of a fully developed spermatozoon, 



magnified 740 diameters. 

 » 13. Anterior extremity of same spermatozoon. 

 » 14. Portion from the middle part of a spermatozoon, 



magnified 2000 diameters. 



Plate V. 



Figs 1-4, Stenocypris malcolmsonii, (Brady). 

 Fig. 1. Left valve of adult female with enclosed animal; 

 viewed from inner face; magnified 61 diameters. 

 » 2. Masticatory part of a maxilla of 1st pair, magnified 

 110 diameters. 



» 3. Eight caudal ramus, lateral view; same enlargement 

 n 4. Left caudal ramus from same individual. 



