Dr. O'Bryen Bellingham on Irish Entozoa. 251 



I ^all conclude by remarking, that the family of Planaria is 

 most widely diffused, and is adapted to the most diOferent stations : 

 on the land, it is adapted to forests and plains, in hot, temperate, 

 and dry climates ; in water, under all latitudes, to fresh, brackish 

 and salt, on sea-beaches, at the depth of 30 fathoms, and in the 

 open ocean. 



XXX. — Catalogue of Irish Entozoa, with observations. By 

 O^Bryen Bellingham, M.D., Fellow of and Professor of 

 Botany to the Royal College of Sm-geons in Ireland, Member 

 of the Royal Zoological, Geological and Natui-al History So- 

 cieties of Dublin, &c. 



[Continued from p. 165.] 



Genus 17. Bothriocephalus. 

 (Derived from j3odpiov, fovea, and KefaXt), caput.) 

 Gen. Char. — Body long, flat, soft, and articulated. Head subtetra- 

 gonal, with two or four opposite depressions. 



The genus Bothriocephalus was established by Rudolphi, and has 

 been adopted by all zoologists since. Pre\aous to his time the 

 species were confounded with those of the genus Tcenia. 



The species are common in tish and bu-ds, more rare in the 

 mammaha, and veiy rare in reptiles ; they usually inhabit the 

 alimentary canal, sometimes the abdominal cavity. The genus 

 is not very numerous in species, only thirty-four being enume- 

 rated by Rudolphi, of which ten are doubtful. He has arranged 

 them in two subdi\dsions ; in one the head is ai-med, in the other 

 this part is naked or unarmed. 



A. Inermes. 



a. Dibothrii. 

 1. Bothriocephalus latus*. . Small intestines of man {Homo). 

 2. claviceps. Intestines oi eel (Atiguilla acutirostris) . 



* We are indebted to Bonnet for the first description approaching 

 to accuracy of the Bothriocephalus latus ; but it is only within a few 

 years that its zoological characters have been properly understood, 

 and we are indebted to Bremser for having first determined these, 

 who removed it from the genus Tcenia, to which it had long erro- 

 neously been supposed to belong. 



The Bothriocephalus latus is the only species of the genus which 

 inhabits the human intestines, and it has received a number of differ- 

 ent names. It is the Tcenia lata of Linnaeus, Pennant and Turton ; 

 the Tcenia ' articulos non demittens ' and the Tcenia ' a anneaux courts' 

 of earlier writers ; the Tcenia vulgaris and Tcenia grisea of others ; 

 the Tcenia inenne umana of Brera ; the Tcenia osculis superficialibus of 



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