ON DREPANIDOTJ^rvIA HEMIGNATHT. 621 



EXPLANATION OF PLATE 46, 



Illustrating Mr. Arthur E. Shipley's paper ''On Drepanido- 

 taenia hemignathi, a New Species of Tapeworm." 



List of Abbreviations. 



cut. = Cuticle, doi's. ex. can. = Dorsal excretory canal, cctod. = Ecto- 

 derm, lai. nerve ^ Lateral nerve. long, muses. = Lougitudiual muscles. 

 Nerv. si/st. = Junction of nerve-cords in head. ov. = Ovary, per. cell =^ 

 Parenchyma cell. Froc. of ectocl. = Knob-like ends of ectoderm cells under 

 cuticle. rec. sem. =: Receptaculum seminis. Ros. =■ Rostellum. tes. = 

 Testis, ttt. = Uterus, ven. ex. can, ^ Ventral excretory canal, ves. sem. =: 

 Vesicula seminalis. 



Fig. 1. — A view of Drepanidotfenia hemiefnathi, x 15. The dark 

 patches in the anterior two-thirds of the body are caused by the generative 

 organs ; in the posterior third they represent the eggs iu the uterus. 



Tig. 2. — An isolated hook from the rostellum, x 500. 



Fig. 3. — A longitudinal section through the head, x 100. The rostellum, 

 ros., is retracted. The point of fusion of the two lateral nerves is shown at 

 nerv. syst. The section passes between the suckers. 



Fig. 4. — A transverse section through a mature proglottis, x 70. 



Pig. 5. — A longitudinal section, somewhat oblique, showing the regular 

 arrangement of the longitudinal muscles, X 50. 



Pig. 6. — A longitudinal section through several mature proglottides, x 50. 

 This shows the transverse connection between the two ventral longitudinal 

 excretory canals and the transverse lines formed by the concentration of the 

 parenchyma at the posterior end of each proglottis. 



Fig. 7. — A view of the head iu an expanded, flattened-out state, x 60. 

 Fig. 8. — A view of another head in a contracted, bunched-up condition, 

 X 40. 



Fig. 9. — A transverse section through the Lead, showing the ten books ou 

 the rostellum and the four suckers. 



Fig, 10. — A portion of a proglottis, highly magnified to show the minute 

 anatomy, x 450. 



