Female reproductory organs (_Oniscus asellus_) 8 21. The male reproductory organs (_Oniscus asellus_) 9 22. The fertilized egg (_Porcellio scaber_) after Roule 10 23. The fertilized egg seen in section (_Porcellio scaber_) after Roule 10 24 to 31. The development of a woodlouse (_Porcellio scaber_) after Roule 10 32. Embryo of the woodlouse showing the three divisions of the intestine separately developed (_Porcellio scaber_) after Roule 11 33. Embryo of the woodlouse showing traces of the segments (_Porcellio scaber_) after Roule 11 34. An embryo woodlouse ready to be hatched (_Porcellio scaber_) after Roule 11 35. Flagellum and last peduncular joint of the antenna of _Ligia oceanica_ 12 36. Flagellum and last peduncular joint of the antenna of _Ligidium hypnorum_ 13 37. Flagellum and last peduncular joint of the antenna of _Trichoniscus pusillus_ 23 38. Flagellum and last peduncular joint of the antenna of _Trichoniscus vividus_ 24 39. Flagellum and last peduncular joint of the antenna of _Trichoniscus roseus_ 24 40. Flagellum and last peduncular joint of the antenna of _Trischoniscoides albidus_ 25 41. Flagellum and last peduncular joint of the antenna of _Haplophthalmus mengii_ 26 42. Flagellum and last peduncular joint of the antenna of _Haplophthalmus danicus_ 27 43. Flagellum and last peduncular joint of the antenna of _Oniscus asellus_ 28 44. Flagellum and last peduncular joint of the antenna of _Philoscia muscorum_ 29 45. Flagellum and last peduncular joint of the antenna of _Philoscia couchii_ 30 46. Flagellum and last peduncular joint of the antenna of _Platyarthrus hoffmannseggii_ 31 47. Flagellum and last peduncular joint of the antenna of _Porcellio scaber_ 32 48. Flagellum and last peduncular joint of the antenna of _Porcellio pictus_ 33 49. Flagellum and last peduncular joint of the antenna of _Porcellio dilatatus_ 34 50. Flagellum and last peduncular joint of the antenna of _Porcellio rathkei_ 35 51. Flagellum and last peduncular joint of the antenna of