Plate IV. 



Page 

 Fig. i. Tedania suctoria O. Schmidt, a styli of various sizes, b tylota x 200, c rhaphides of the 

 three different sizes, all from one specimen x 380, d the upper end of one of the 

 largest and one of the smallest rhaphides x 1400 1 



— 2. Histoderma appendiculatum Cart, a tylota with intermediates to strongyla from the dermal 



layer and the inner body x 165, b chelse arcuatse, side and front view x 1000, 



c sigmata x 460 7 



— 3. Histoderma physa O. Schmidt, a strongyla of various sizes x 165, b chelae arcuatse, front 



and side view x 1000, c trichodragma x 380 11 



— 4. Histodcrmclla Ingolfi n. sp. a tylota of various sizes, b a young and an older develop- 



mental stage, c acanthoxea, d a not quite young developmental stage x 200, c chelae 

 arcuatse side view, a little from behind, and front view x 1000, f sigmata x 460.... 14 



— 5. Histoderjiiella coriacca n. sp. a strongyla of various sizes from the dermal layer and the 



inner body; with the magnification used the spinulation of the ends is not seen, b acantho- 

 strongyla x 165, c ends of two strongyla, showing the minute spinulation x 700 ... 16 



— 6. Inflatclla pellicula O. Schmidt, a strongyla of various sizes, b a developmental stage x 200 18 



— 7. Inflatclla viridis Tops, a strongyla of various sizes, b a developmental stage x 165 20 



