BLOOD-PARASITKS. 407 



in the Giirdens belong to the two great groups of tlie Protozoa 

 and the Worms, and, as regards the elements of the blood, they 

 are either extra-corpuscular or inti-a-corpuscular. 



I will begin with the extra-corpuscular parasites, those which 

 live in the serum, and these are the nematode worms, the spiro- 

 chetes, the trjpivnosomes, and other tiagellates. 



Firstly, the nematode worms— they all belong to the class 

 Filai'ia. The embryos only are found in the blood, as the adult 

 filarjte could not jmss through the capillaries. These microfilarije 

 are the least harmful to their hosts of any of the blood -parasites, 

 and all the pathological eflects we know of filaria? are due to the 

 adult worms, which have been found only in a very small pro- 

 portion of the cases here. The embryos are generally surrounded 

 by a fine capsule, which is cast oft' when they enter into the body 

 of the mosquito, when their further development takes place. 



1 have found microfilariie in the blood of 15 mammals of 

 13 different species, in 101 birds of 74 different species, and in 

 13 reptiles of 5 different species; and filarial have not been 

 found before in 88 out of these 92 species of animals, and are 

 new, at any rate as regards hosts. The animals in which they 

 have been found have come from all parts of the world, the largest 

 number from the Americas, but the following list will show how 

 wide-sjiread the infection is. 



Embryo Fxlari.e found in the Blood of Mammals. 



(All are e it her new hosts or new parasites, or both, except those 

 marked with an asterisk.) 



^'ame. Habitat. Tvi-e of Filaeia. 



Suncate [Suricata suricatta) S. Africa. Loii"-. 



Black-liuiided Spider Monkey [Ateles C. America. Lon^r' 

 geoffroyi). '^' 



Black-headed Leimir {Lemur mungos). Madagascar. Long and slender. 



Crowned Lemur {Lemur coronatus) . . . do. Very Ion-, striated 



White -fronted Capuchin {Cebus Ecuador. Medium, Thick. 



albijrons). 



Golden Cat {Felis femmincki) Sumatra. Long. 



Bridled Wallaby {Onychoqale fre- N.S.Wales. Long 

 nata). ^' 



Rat-tailed Opossum {Bklelphys nudi- S. America. Medium 

 caudata). 



Collared Peccary (Z'flj/assM !;«/««() ... do. Long. 



3 Pinche Marmosets {Leontoeehus Colomltia. Lone-. 



cedipus). '"" 



Lion Marmoset (i«wt^oce6tts,-osrt//«)- Brazil. Long. 



Javan Chevrotain {Tragtdus Java. Lon''. 



Javanicus). "' 



Ant-e&iGY {Myrmeco2)haga tvidactijla) S. America. Medium. 



Birds. 



Himalayan Wiiistling Thrush (J/i/M- X. India. Short. 



phon-ens temmmrki). 

 Lanreolated Jay (Garrulus lauao- do. Short. 



IrJtl(f). 



