RESEARCHES IN HELMINTHOLOGY AND PARASITOLOGY. I51 



[October. 1878. No. 463. See Bibliography.] 



Notice of a Tetrarhynchus. — Prof. Leidy stated that in the Remora, 

 or Sucker, from our coast, presented this evening by Mr. Holbrook, 

 he had found a curious parasite. This was inclosed in a compressed 

 oval cyst, pearly white, thick-walled, and about half an inch long, 

 tightly adherent to the intestine of the fish. The cyst contained a 

 flask-shaped, translucent whitish sac, which was feebly contractile 

 and furnished at the narrow end with two minute papillae, which 

 were slowly protruded and retracted. Within this sac- worm, coiled 

 up about the center, was an opaque white worm or scolex, which 

 proved to be a Tetrarhynchus. Removed and extended, it measured 

 7 lines long and was divi.sible about equalh^ into a broad anterior 

 body portion and a posterior narrow tail-like portion. The head 

 was formed of a pair of obcordate bothria inclined from each other. 

 Four long tortuous proboscides extended through the bod}- and pro- 

 jected from the head. The projecting portions were successively 

 elongated and shortened by eversion and inversion and were armed 

 with recurved hooks. The hooks extended within half the length 

 of the proboscides and, as they were everted and inverted, appeared 

 like the streaming of liquid through narrow tubes. The tortuous 

 proboscides at the bottom were continuous with as many elliptical 

 pedestals placed at the back part of the body. The tail, about half 

 the width of the body, was not segmented, but exhibited a disposi- 

 tion to assume this condition. The end was slightly tapering and 

 occupied by a bell-shaped sinus opening externally and alternately 

 contracting and expanding. The interior of the sinus was lined 

 and its mouth thickly furnished with non-vibratile cilia. The spe- 

 cies appeared to be undescribed and was named Tetrarhynchics temii- 

 caudatus. 



[December, 1878. No. 466. See Bibliography.] 



On Tcenia Mcdiocanellata . — Prof. Leidy exhibited two specimens 

 of tape-worms, Tcrnia mcdiocanellata, both retaining the head. These 

 had been recently submitted to him for examination by Dr. James J. 

 Levick and Dr. Walter P. Atlee. Tape- worm appears not to be a 

 common affection with us. Several physicians, in extensive prac- 

 tice in this city, had informed him that they never had a case. 

 During the last ten or fifteen years from one to two specimens an- 

 nually had been submitted to him, but the present year he had seen 

 five specimens. He had been surprised to find that all pertained to 

 the species indicated. Formerly he supposed that our common 



