THE MAGAZINE 



OF 



NATURAL HISTORY. 



NOVEMBER, 1838. 



Art. I. — Notices of Irish Entozoa. By James L. Drummond, 

 M.D., Professor of Anatomy in the Royal Belfast Institution, Pre- 

 sident of the Belfast Natural History Society, &c. 



(Continued from page 424). 



Tetrarhynchvs grossus. 



" Tetr. capitis ovalis discreti-hothriis ohlongis profundis marginatis, cor- 

 pore depresso recto, apice papillari." — Rud.' Entoz. Syn. p. 129, t. ii.f. 9, 10. 



On the 24th of June, 1838, 1 found a very perfect specimen 

 of this species adhering to the peritoneal coat of the rectum 

 of a salmon ; it was still living, and showed a little contrac- 

 tile motion. It lay loose in the abdominal cavity, its head 

 excepted, which was fixed to the intestine ; its caudal end 

 was directed forwards. It was two inches long ; and a quar- 

 ter of an inch broad at its greatest transverse diameter : its 

 colour white, except half an inch of the anterior end, which 

 was reddish, and seemed almost like a reflection of the outer 

 coat of the intestine to which the animal adhered. This part 

 was firm, and nearly cylindrical, the rest flatter, especially 

 towards the lower end, which terminated in a delicate pro- 

 cess of about a line in length. The inferior broadened part 

 was finely crenate at the edges, and had a sub-articulate ap- 

 pearance from numerous transverse stria, giving an imperfect 

 resemblance to the structure of a tape-worm. Two of the 

 proboscides were free, and the other two fixed in the intestine. 

 I have only met with this one specimen. 



Vol. II.— No. 23. n. s. 3l 



