164 DR. T. S. COBBOLD ON ENTOZOA. 



amples of Fentmtoma proboscideum occupied the mesenteric folds, but with reference to 

 their structui-e I am imable to add any new or otherwise interesting facts. 



Passing to the consideration of Entozoa in bu-ds and mammals, my remarks under the 

 former head will be very short, as they are designed to indicate little more than a record 

 of worms found iu particular species. 



Falco milvus. — In the duodenum of a Kite opened on the 16th AprU, 1855, there were 

 present five or six specimens of Ascaris depressa, several examples of TricJiosoma Falco- 

 num, and multitudes of ^«?Miis^omMWi sjMthnla (Diesing). The latter — better known as 

 the Amphistoma macrocephalmn of Rudolphi — presented a bright grass-green colour, 

 owing to the quantity of bUe ta the intestine. Outside the gut there was a minute botry- 

 oidal fatty mass, consisting of four unequal lobules imited together and attached by two 

 filamentary stalks ; each of these lobes contained an encysted nematode. 



Falco tinmmculus ; F. peregrinus ; Accipiter nisus ; Fernis apivorus ; Strix ottis. — 

 Specimens of Ascaris depressa were obtained from a Kestrel on the 21st of January, 1856, 

 and being very numerous they completely choked that part of the intestiue in which 

 they were lodged ; a solitary individual was also prociu'ed from the duodenum of a Honey 

 Buzzard on the 30th of May of the previous year. From the cellular aponeurosis at the 

 back of the abdominal cavity of a Peregrine, I also obtained ia April of the same year 

 a sragle specimen of Filaria attenuata, measuring nearly 10^ inches; and from the 

 stomach of a Sparrow Hawk dissected in January 1856, an example of Spiroptera lep- 

 toptera. This last entozoon I have also found associated with Semistomum spathula in 

 the small intestine of the Long-eared Owl in the month of January. 



Totanus calidris ; Numenius arcuata. — ^I have taken Tcenia variabilis from the small 

 intestine of the former of these allied species in January, and also T. sphcerophora (figs. 

 63-67 inclusive) from the Curlew at the same period in great abundance, the latter 

 entozoon being situated midway between the gizzard and cloaca. As tliis cestode is only 

 imperfectly known, some additional facts m regard to it may prove acceptable. The 

 head is correctly described by Diesing as obcordate, but no mention is made of the arma- 

 ture of hooks svu-rounding the rostelliim, ; this is not to be wondered at, considering the 

 facility with which they drop off after death, or during life, on even the most gentle 

 handling. One cannot judge how many it carries from the number found in the prosco- 

 leces, where there appear to be six hooks arranged as usual in three pairs on the proboscis ; 

 and in no case have I seen the adult cestode with its fuU complement. The anterior seg- 

 ments are extremely narrow, but well defined immediately below the head, the sucker- 

 bearing and proboscideal divisions ajjpearing to represent very distinctly two rings of 

 the segmental series, or in other words, the first two modified individuals of the colony, 

 if we can suppose with Van Beneden each proglottis to represent an independent animal. 

 The middle and succeeding segments become gradually broader and deeper toward the 

 caudal extremity, the lateral margins showing a bUobular outline; the intromittent 

 organs are placed consecutively on one side only, their bulk being comparatively large ; 

 and the external wall of the sheaths is closely beset with minute spines dii-ected back- 

 wards when the organs are protruded. The segments near the tail seemed ready to 

 burst from the volume of the contained ova, most of which latter, when withdrawn and 



