XXIV DESOEIPTION OF PLATES. 



PIG. 



2. Portion of a large hydatid from a cyst in the human liver. Part of a speci- 



men preserved in the Middlesex Hospital Museum. Dr. MurcMson's case. 

 Coloured naturally by bile. Original. 



3. Similar portion of another human hydatid, artificially coloured with magenta. 



Dr. Greenhow's case. Specimen preserved in the same museum. 

 Original. 



4. Scolex, or one of the Echinococcus heads, showing, more particularly, the hooks, 



suckers, and calcareous particles. From a zebra (x about 500 diam.). 

 After Huxley. 



6. Two of the hooks separated ; one seen in profile, the other in front. Huxley. 



6. An entire sexually mature Tcenia echinococcus, showing the head, with rostel- 

 lum and suckers, and the three succeeding segments, the last of which 

 contains the ova and other reproductive elements. The water-vascular 

 system is likewise displayed. Outlined, with the aid of a camera, from a 

 specimen prepared by Leackart, and now preserved in the Author's collec- 

 tion. (Magnified 30 diam.) Original. 



PLATE XIV. 



1. A detached and flattened Echinococcus brood-capsule, showing the scolices 



in various stages of development, and their attachment, in sitH. Taken 

 from an hydatid found in the pig. — Busk. 



2. An imperfectly developed scolex, from the same. — Busk. 



3. One of the smaller hydatids, or so-called daughter vesicles in process of 



degeneration. The partially disintegrated scolices and separated hooks 

 are seen in the interior. — Busk. 



PLATE XV. 



1. Group of Echinococci attached by their pedicles to a portion of the collapsed 

 wall of a brood-capsule ; all the heads and cephalic hooks remaining 

 inverted. From the hydatid of a sheep. — Busk. 



2 — 7. Six scolices in various stages, separated from an hydatid occapying the 

 human liver. They floated loosely in a bright yellow-coloured fluid, dis- 

 tending the maternal cyst. — Busk. 



PLATE XVI. 



1. A full-grown male specimen of Ascaris liimbricoides ; showing, especially, the 



prominent mouth and double spiculum. Natural size. 



2. Head of the same, exhibiting the form and position of the separate lobes of 



the lip (x 10 diam.) 



3. Tail of the male (x 10 diam.). 



4. Tail of the female (x 10 diam.). 



5. Vas deferens, seminal reservoir, and pouch for the spicules. Slightly enlarged 



from a dissection. 



6. Uterus, uterine horns, and comiacnccment of the oviducts. Slightly enlarged. 



The above figures are original. — T. S. C. 



