94 W. BLAXLAND BENHAM. 



DESCRIPTION OF PLATES 7 & 8, 



Illustrating Mr. W. Blaxland Benham's paper on "The 

 Structure of the Rostellum in two New Species of Tape- 

 worm, from Apteryx." 



Drepanidotsenia minuta, n. sp. 



Fig. 1. — The entire strobila, stained and mounted as a transparent object. 

 X 30. (Camera.) 



Fig. 2.— The " scolex," seen as an opaque object, in alcohol, uncompressed, 

 showing the flaps of the suckers more plainly than in the compressed 

 specimen. 



Fig. 3. — Three different suckers, showing mobility of the flap or anterior 

 margin of the sucker ; the muscle-fibres of the margin are seen to be continued 

 on to this apparent flap. 



Fig. 4. — A transverse section through the scolex. X 46. (Camera.) 

 jR. rostellum, r. receptaculum rostelli. 



Fig. 5.— One of the rostellar hooks; a. blade, b. handle, c. guard. X 625. 

 (Camera.) 



Fig. 6. — Outline of the terminal proglottid of a strobila from a horizontal 

 (though somewhat oblique) section ; e. eggs, /;. coiled penis, o. genital pore. 



Fig. 7. — Outline of isolated detached proglottid : the margins a. b. corre- 

 spond with those in Fig. 8. 



Fig. 8. — Onchosphere in its envelopes. 



Drep. apterygis, n. sp. 



Fig. 9.— The entire strobila, natural size. 



Fig. 9a. — Scolex; freehand. 



Fig. 10. — Apex of scolex, with protruded rostellum. 



Fig. 11. — A rostellar booklet, a. blade, b. handle, c. guard. 



Fig. 12. — Transverse section of scolex. x 150. (Camera.) r. recepta- 

 culum rostelli, x. aperture of excretory tubule. 



Fig. 13. — A portion of the strobila, mounted, entire, transparent, somewhere 

 near the middle, x 78, (Camera.) It happens that, of the five proglottids 

 figured, four have the genital pore on the same side ; in other regions the 

 alternation of the pores is more regular, o, genital pore, p. everted penis, 



