29() H. J. VAN CLEAVE 



Figs. 17 to 19 Eorhynchus gracilisentis. (Van C). 



Fig. 17 Genital organs in posterior region of male ; reconstruction from sagit- 

 tal sections. 



Fig. 18 Reconstruction of male copulatory apparatus. X 310. 



Fig. 19 Male copulatory apparatus everted; toto mount. X 97. 



Figs. 20 to 28 Eorhynchus longirostris (Van C). 



Fig. 20 Cement gland. X 97. 



Fig. 21 Proboscis of fully mature female; in balsam. X 97. 



Fig. 22 Anterior end of body; proboscis retracted; toto mount. X 30. 



Fig. 23 Portion of body wall in sagittal section. X 310. 



Fig. 24 Embryos. X 310. 



Fig. 25 Nuclei from muscle sac, posterior to cement reservoir. X 310. 



Fig. 26 Sagittal section through anterior end of body, showing location of 

 brain and terminal proboscis organ. X 97. 



Fig. 27 Reconstruction of female genital tract, showing divisions and the nu- 

 clei. X 97. 



Fig. 28 Dorsal retractor of proboscis receptacle; toto mount. X 97. 



Fig. 29 Eorhynchus tenellus (Van C), proboscis of mature male. X 97. 



Fig. 30 Hooks of Eo. tenellus. X 310. 



Fig. 31 Eorhynchus rutili; copied from Liihe, 1911. About X 20. 



