Plate XIX. 



Page 

 Fig. I. Iotroclwta spiiiosa n. sp. a acauthostyli, b tylotum, x 200, c birotula of the large form, 



d developmental form, x 1000, e birotula of the small form, x 1400 195 



— 2. Forcepia forcipis Bow. a styli, b tylotum and polytylote developmental form, x 200, 



c chela arcuata of the large form, front view and side view, d chela arcuata of the 

 small form, front view and side view, x 1000, e forceps of the large form, f develop- 

 mental form, x 255, g a piece of one of the legs, about from the middle, x 1000, 

 h forceps of the small form, x 1400 198 



— 3. Forcepia fabricans O. Schmidt, a styli, b tylota, one slightly, the other distinctly polyty- 



lote, x 200, c chela arcuata, front view and side view, x 1000, d forceps of the large 

 form, e developmental form, x 1000, f forceps of the small form, x 1400, g sigma, 

 x 460 201 



4. Forcepia Topsentii n. sp. a styli, b tylotum, x 200, c chela arcuata, front view and side 

 view, x iooo, d forceps of the large form, x 675, e the same of obtuse-angled form, 

 x 460, f forceps of the small form, x 1400, g sigma, x 460 204 



— 5. Forcepia Thielei n. sp. a styli, b tylotum, x 200, c chela arcuata, front view and side 



view, x 1000, d forceps, x 1000, c sigma, x 460, f spined stylus from embryo, x 585. 206 



