1862. ] DR. T. S. COBBOLD ON HUMAN ENTUZOA. 289 
15. Filaria lentis, Diesing. 
16. Strongylus bronchialis, Cobbold. 
17. Eustrongylus gigas, Diesing. 
18. Sclerostoma duodenale, Cobbold. 
19. Spiroptera hominis, Rudolphi. 
20. Oxyuris vermicularis, Bremser. 
21. Tenia solium, Linneus. 
mediocanellata, Kiichenmeister. 
23. acanthotrias, Weinland. 
24, flavopuncta, Weinland. 
25 marginata, Batsch. 
26. echinococcus, Siebold. 
nana, Siebold. 
elliptica, Batsch. 
29. Bothryocephalus latus, Bremser. 
cordatus, Leuckart. 
In this list it will be observed that I have purposely omitted the 
Acarine genus Pentastoma, the Aunelid Dactylius aculeatus (Curling), 
and several other internal parasites not strictly referable to the Hel- 
minths. 
Up to the present hour no one has recorded the occurrence of any 
acanthocephalous helminth within the human body, although it is 
well known that Echinorhynchi have been found in all the vertebrate 
classes, and even in the Simiade*. 
1. FascroLa HEPATICA, Linnezeus. 
F. hepatica, Linnzus, Pallas, Fabricius, Miller, Frohlich, Bose, 
Blanchard, Cobbold, &c. 
F.. humana, Gmelin. 
Distoma hepaticum, Abildgaard, Zeder, Mehlis, Rudolphi, Brem- 
ser, Delle Chiaje, Dujardin, Creplin, Siebold, Owen, Pluskal, Kii- 
chenmeister, Diesing, Weinland, Simonds, &c. 
Planaria latiuscula, Goeze. 
The general structure of this parasite is now thoroughly well 
understood, although some minor points, more especially in respect 
of the mode of origin of the branches of the water-vascular system, 
remain to be investigated. The old view of Mehlis, as to the termi- 
nation of the excretory system by an open foramen caudale, although 
* In connexion with this subject I may remark that I have just received 
(Nov. Ist) a most interesting brochure from Prof. Rudolf Leuckart, in which 
he describes a remarkable series of genetic changes discovered by him as occur- 
ring in Echinorhynchus proteus. Coutrary to our previous notions, he proves by 
experiments (with eggs administered to the Gammarus pulex of our ponds and 
rivers) that the embryos materially differ from the adult forms, and stand in the 
same relation to them that the larval Pluteus and Pilidium respectively do to 
Ophiurus and Nemertes. An alternation of generations was certainly quite un- 
suspected. The title of the paper is “ Helminthologische Experimentaluntersuchun- 
gen,” having been communicated to the Gottingen kénigliche Gesellschaft der 
Wissenschaften on the 9th October, 1862. Prof. Busk has since given a trans. 
lation of this paper in the ‘ Microsc. Journal’ for January 1863. 
Proc. Zoou. Soc.—1862, No. XIX. 
