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 140x3 i 



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



layer and the inner body x 165, b chelae arcuatae, 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 arcuatae, front 



and side view x 1000, c trichodragma x 380 u 



4. Histodermella 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 

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



5. Histodermella coriacea 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. Inflatella pellicula O. Schmidt, a strongyla of various sizes, b a developmental stage x 200 18 



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



