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. XXVII. On some new forms of Entozoa. By T. SPENCER COBBOLD, Es9,, MD., F.L.S. 
Read January 20th, 1859, 
Br permission of the authorities of the Zoological Society, I have enjoyed the opportunity 
of examining a large proportion of such animals as have died at the Society’s Gardens, 
Regent’s Park, during the spring and winter months of last season. 
The materials thus afforded for a search after Entozoa consisted of six species of Reptiles, 
thirty-one of Birds, and the same number of Mammals. With three duplicate exceptions 
in the case of birds, and one in mammals, only a single example of each species came 
under notice, thus giving a total of seventy-two animals subjected to dissection. Of these, | 
but three reptiles, nine birds, and ten mammals were found infested,—a result of con- 
siderable interest to.the Zoological Society, as it proves these animals to enjoy greater 
freedom from internal parasites in their condition of. domesticity than in the wild state. 
This indeed is precisely what we should expect, as it is well known that the larvæ of Entozoa 
occur.only in a limited number of hosts; and it is equally evident, in the case of Trematoda 
for example, that the uninfested foreign animals can have had no opportunity of devour- 
ing the various forms of molluscan hosts which under ordinary circumstances supply the 
cercariæ destined to become adult flukes in their viscera. 
1. DistomA comPACTUM (mihi). Body smooth, ovate, oblong, not compressed ; oral sucker 
terminal, orbieular; ventral sucker subcentral, aperture triangular ; reproductive 
pore immediately below, a little to the left. Length j-j in.; breadth 3-3 in. 
(Pl. LXIII. figs. i, 3, 3.) HÆ oun gat 
—. Remarks.—On the 19th of February I removed five specimens. of this trematode from 
pustular cavities in the left lung of an Indian Ichneumon (Viverra mungos, L.). All con- 
.. Jecture as to the source of its larvae must be useless; but the adult form is well marked, 
and easily recognized by the compact condition and arrangement of the internal organs, It 
is provided with a short æsophageal bulb, giving off two simple, tortuous and unusually 
broad digestive canals. The twisting is so marked and regular as to approach the peculiar 
zigzag condition of Campula—a genus which I have recently established (Linn. Trans. 
Vol. xxii, part 3. p.168). The vitelline cæca almost entirely cover the lateral and dorsal - 
surfaces, and are connected in the middle line by two primary transverse branches ; these 
Again unite to form à trunk which opens into the base of the short and folded uterine 
tube. The testes lie directly below. hk Wl 
The nearest resemblance to this species is a fluke discovered by N atterer at Matogrosso, 
in cavities of the lungs of the American Otter. Under the title of Distomum rude, Diesing 
has described and figured it in his ‘ Neunzehn Arten von Trematoden : p. o ge. 
