322 Dr. O'Bryen Bellingham on Irish Entozoa. 



no m - 2* [Small intestine of herring-gull (Larus ar- 



28. fta* porosa!*.. j J^rtrtw). 



Species dubice. 



29. Tcenia f. Small intestine of wild cat (Felis Catus). 



30. { . Small intestine of rat (Mus decumanus). 



31. § . Small intestine of thrush (Turdus musicus). 



32. || . Small intestine of thrush (Turdus musicus). 



* Upon two occasions I found specimens of Tcenia which had the 

 characters of the Tcenia porosa, firmly attached together as if in coitu, 

 the lemnisci of one being inserted into the lateral pores of the other. 

 Hence this species cannot be truly hermaphrodite, as the majority of 

 Tcenice are believed to be. 



t In the month of March 1837 I found a single specimen of a 

 Tcenia in the duodenum of a wild cat (Felis Catus) taken in the north 

 of Ireland, which appears to be undescribed. The neck is long j the 

 body dark-coloured when first removed from the animal ; the four 

 oscula appeared to the naked eye like four circular spots ; the disc of 

 cilia was prominent and white. It most nearly resembled the Tcenia 

 crassicollis, which is common in the domestic cat, but it differed in 

 several respects from it. 



X Upon several occasions I have found in the small intestines of the 

 rat (Mus decumanus) a species of Tcenia which differs from those de- 

 scribed by Rudolphi as occurring in this animal, and comes nearest 

 the description of a species mentioned by Creplin under the name 

 Tcenia muris ratti. It belongs to the division ' Inermes ' in Rudolphi's 

 arrangement, and to the subdivision ' Rostellatce.' The length is from 

 three to four and a half inches ; colour white ; body filiform ante- 

 riorly ; head small, subglobose ; in some apparently not separated 

 from the body by any narrower portion or neck, in others this part is 

 seen and is very short. Rostellum unarmed, cylindrical and very 

 short ; oscula round and slightly prominent ; anterior articulations in- 

 distinct, those next exceedingly short, almost linear, and increasing 

 gradually in length, their angles acute ; marginal orifices not con- 

 spicuous. 



§ Upon one occasion I met with several specimens of an unde- 

 scribed species of Tcenia in the small intestine near the gizzard of a 

 thrush (Turdus musicus). It belongs to the division ' Armatce' in 

 Rudolphi's arrangement : the length is about 2 inches ; the head 

 small, and with the rostellum has a triangular shape ; the oscula are 

 large and conspicuous ; the rostellum very short, cylindrical, thick, 

 and armed with minute spines. The body anteriorly is as fine as a 

 thread, and is but little broader posteriorly ; the anterior articula- 

 tions are short; the next longer than broad, somewhat funnel-shaped; 

 the most posterior are broader than long, and rather elliptical than 

 infundibuliform. 



|| This species of Tcenia occurred in the small intestine near the 

 large of the thrush, and differs in several respects from the prece- 

 ding ; it belongs however to the same division in Rudolphi's arrange- 



