164 DR. T. S. COBBOLD ON ENTOZOA. 
amples of Pentastoma proboscideum occupied the mesenteric folds, but with reference to - 
their structure I am unable to add any new or otherwise interesting facts. : 
Passing to the consideration of Entozoa in birds 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 in partieular species. ; 
Falco milvus.—In the duodenum of a Kite opened on the 16th April, 1855, there were 
present five or six specimens of Ascaris depressa, several examples of Trichosoma Falco- 
mm, and multitudes of Hemistomum spathula (Diesing). The latter—better known as 
the Amphistoma macrocephalum of Rudolphi—presented a bright grass-green colour, 
owing to the quantity of bile in the intestine. Outside the gut there was a minute botry- 
oidal fatty mass, consisting of four unequal lobules united together and attached by two 
filamentary stalks; each of these lobes contained an encysted nematode. 
Falco tinnunculus; F. peregrinus; Accipiter misus; Pernis apivorus ; Strix otus.— 
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 intestine in which 
they were lodged; a solitary individual was also procured 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 in April of the same year 
a single specimen of Filaria attenuata, measuring nearly 104 inches; and from the 
stomach of a Sparrow Hawk dissected in J anuary 1856, an example of Spiroptera lep- 
toptera. This last entozoon I have also found associated with Hemistomum spathula in 
the small intestine of the Long-eared Owl in the month of J anuary. 
Totanus calidris; Numenius arcuata.—T have taken Tenia variabilis from the small 
intestine of the former of these allied species in J anuary, and also 7. spherophora (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 this cestode is only — 
imperfeetly known, some additional facts in 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 surrounding the rostellum; 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; — Å 
and in no case have I seen the adult cestode with its full complement. The anterior seg- 
mente are extremely narrow, but well defined immediately below the head, the sucker- 
bearing and proboseideal divisions appearing 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 bilobular 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 directed 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 
