1862.] DR. BAIRD ON TWO NEW CESTOID WORMS. 21 



circlet or corona of booklets round the mouth, with the distinctly 

 formed segments of the lower extremity of the body (unfortunately 

 not represented in the plate), compel me to refer it, for the present 

 at least, to that genus. I am not aware of any Cestoid Worm having 

 been described which presents anything like the form of this curious 

 parasite : and I have been very much assisted by the intelligent aid 

 of the draughtsman, Mr. Jennens, who executed the accompanying 

 plate, in making out the anatomy of its head and mouth. 



This parasitic Worm was taken from the rejectamenta either of 

 the stomach or intestines of a Puma which lately died in the Gardens 

 of the Society in Regent's Park. 



Hab. Stomach? or intestines? of the Puma (Felis concolor). 



Mus. Brit. 



2. T^NIA SEMITERES. (PI. II. figS. 8-12.) 



Head rounded ; neck and body continuous, the former differing 

 only slightly in circumference from the head. The whole body of 

 the Worm is very rigid, and the greater portion of it is cylindrical 

 in shape, only the last third of its length becoming flattened and 

 slightly larger than the upper two-thirds. The first segments or 

 joints are very narrow, gradually becoming a little broader and losing 

 their rounded form. The last ten or eleven joints exhibit the genital 

 orifices irregularly alternate — at first two or three occurring on the 

 same side, then two or three on the opposite side, and the last three 

 or four regularly alternate. The lower edges of the upper articula- 

 tions are somewhat vandyked or scolloped (fig. 11). The neck is 

 not distinguishable from the body. The head (fig. 9) is rounded, 

 and the four bothria or suckers are circular in shape. The mouth is 

 also circular, and is beset with a crown or circlet of pretty strong 

 amber-coloured booklets, curved inwardly (fig. 10). 



This is an anomalous-looking Tcenia, the body being rigid and 

 hard, and for the greater portion of its length quite cylindrical. 



Length about 4|- inches, breadth of upper portion \ a line, middle 

 of lower portion 1 line. 



For this species we are indebted to Mr. Baker, of the British 

 Museum, who took it from a Persian Cat. It was alive when he 

 first found it. 



Hab. Stomach of the Felis catus, var. persica. 



Mus. Brit. 



EXPLANATION OF PLATE IL 



Figs. 1-7. Tcenia ammonitiformis. 1. Nat. size. 2. Ditto, partially unrolled. 



3. Portion of body magnified. 4. Ditto, still more highly magnified. 



5, G. Head. 7. Circlet of hooks round the mouth. 

 Figs. 8-12. Tmnia semiteres. 8. Nat. size. 9. Head. 10. Mouth and circlet 



of booklets. 11, 12. Portions of upper and lower part of body magnified. 



