294 DR. T. S. COBBOLD ON HUMAN ENTOZOA. [NoV, 25, 



This species was once found by Dr. Treutler in a diseased ovarium ; 

 and no second instance of its occurrence in Germany or elsewhere 

 has since been recorded. A concise description of this trematode, 

 which attains a length of 8 lines, is given in Prof. Owen's article 

 "Entozoa" in the 'Cyclopedia of Anatomy and Physiology.' It is 

 also figured from Treutler in various works. Van Beneden and Ger- 

 vais have supposed that this parasite may, after all, have only been 

 the Pentastoma denticulatum. This view is inadmissible. (See a 

 footnote by Leuckart, in his monograph of the " Bau und Ent- 

 wicklungsgeschichte der Pentastomen," p. 11.) 



9. Hexathyridium venarum, Treutler. 



H. venarum, Treutler, Jordens, Rudolphi, Brera, Bremser, Diesing, 

 Leidy, Weinland. 



Heocastoma venarum, Cuvier. 



Hexacotyle venarum, Blainville. 



Linguatula venarum, Lamarck. 



Poly stoma sanguicola, Delle Chiaje, Frick. 



P. venarum, Zeder, Rudolphi, Dujardin, Owen, Dubini. 



This species is better known than the above. Treutler originally 

 obtained two specimens from the blood of the anterior tibial vein of 

 a young man who accidentally. ruptured the vessel while bathing at 

 Leipsic. Rudolphi and others sought to throw doubt on Treutler's 

 observation, and referred these worms to the freshwater Planarice. 

 At Naples, however, Delle Chiaje subsequently procured specimens 

 from the sputa of two young persons suffering from haemoptysis ; 

 and a fourth instance has also been noticed by Follina, where the 

 worm was found in venous blood. This species attains a length of 

 3 lines, is cylindrico-lanceolate in shape, its six suckers being biseri- 

 ally disposed on the under side of the so-called head. 



10. AscARis LUMBRicoiDES, Limiseus. 



A. lumbricoides, Linnseus, Bloch, Goze, Werner, Gmelin, Schrank, 

 Frohlich, Rudolphi, Jordens, Brera, Otto, Bojanus, Deslongchamps, 

 Bremser, Blainville, Nitzsch, Delle Chiaje, Cloquet, Schmalz, Gurlt, 

 Cuvier, Owen, Creplin, Eschricht, Sortegana, Gluge, Siebold, Du- 

 jardin, Pruner, Blanchard, Kuchenmeister, Richter, Moquin-Tandon, 

 Weinland, &c. &c. 



Fusaria lumbricoides, Zeder. 



Lumbricus teres hominis, Tyson, Redi, Valisneri. 



1 Nematoideum hominis (ventriculi), Degland, Leveille, Clesius. 



? N. hominis (yiscerum), Pruner, Diesing. 



? Ophiostoma pontierii, Cloquet, Delle Chiaje, Bremser. 



This well-known parasite is by some still considered identical with 

 Ascaris megalocephala of the horse and A. suilla of the hog ; but I 

 agree with Dujardin, Moquin-Tandon, Claparede, and others in re- 

 garding it as distinct. The anatomy of Ascaris lumbricoides has 

 been well illustrated by Cloquet and others ; but the precise manner 

 in which the young gain access to the human body is very imper- 



