Xll LIST OF WOODCUTS. 



Fig. 19. Astaeiw fluviatilis. Muscular tissue 

 ,, 20. „ „ Muscles of chela . 



„ 21. „ „ Articulation or abdominal 



MITES ..... 



„ 22. ,, „ Muscular system . 



,, 23. ,, ,, Nerve fibres . 



,,24. ,, ,, Nerve ganglia 



,,25. ,, ,, Nervous system 



,, 26. „ „ Olfactory and auditory organs 114 



,, 27. ,, ,, Auditory sac .... 



,,28. ,, ,, Structure of eye 



,, 29. ,, „ Diagram of eye . 



„ 30. „ „ Female reproductive organs . 



„ 31. ,, „ Male reproductive organs . 



,,32. ,, ,, Structure of ovary . 



„ 33. „ „ Structure of testis 



,,34. ,, ,, Spermatozoa .... 



,, 35. ,, „ The last thoracic sternum in the 



male and female 



,,36. ,, ,, Transverse section of abdomen 



„ 37. „ ,, Abdominal appendages 



„ 38. ,, ,, Connection between thorax and 



abdomen .... 



,, "39. „ „ Cephalothoracic sterna and en- 



dophragmal system 



,, 40. „ ,, Ophthalmic and antennulary so- 

 mites 



,, 41. „ ,, The rostrum .... 



,, 42. „ ,, A Segment of the endophracmal 



SYSTEM .... 



43. „ ,, Longitudinal section of cephalo- 



thorax 



44. , ,, The third maxillipede . 



