28 



bulletin: museum of comparative zoology. 



EXPLANATION OF PLATES. 



All figures are from preparations of Hemiurus crenatus. Figures 28 and 42 are 

 diagrams reconstructed from camera outlines made from several consecutive sec- 

 tions. All other figures were drawn with the aid of the camera lucida. 



ABBREVIATIONS. 



o'dt. . . . Oviduct. 

 o'typ. . . . Ootype. 



pa'ench. . . Vesicular parenchyma. 



pa^ench. cl. . Cellular parenchyma. 



pa'ench gran. Periplieral granular pa- 

 renchyma. 



pap. sns. . . Sensory papillas. 



phx. . . . Pharynx. 



po. exc. . . Excretory pore. 



po. gen. . . Genital pore. 



])rs. prost. . Pars prostatica. 



rep. sem. . . Seminal receptacle. 



rep. sem. ut. Receptaculum seminis 

 uterinum. 



sac. cir. , , Cirrus-sack. 



sn. gen. . . Genital sinus. 



te Testes. 



trn. exc. . . Excretory trunk. 



ut Uterus. 



va. exc. . . Excretory vessel. 



vlv. exc. . . Excretory valve. 



vsl. exc. . . Excretory vesicle. 



vsl. i. . . . Inner vesicle of recep- 

 taculum seminis. 



vsl. sem, . . Seminal vesicle. 



vtm. . . . Vitellarium. 



