WORMS FROM MAMMALS A^D BIRDS. 



499 



measures 027 mm., it also has tlie shape of a tube, termiuating 

 in a memlii-anous, hooked extremity. 



Female 160-250 mm. long, Avith a greatest thickness of ahout 

 0*38 mm. Head O'll mm. broad. 



The anterior region of the oesophagus measures 0*58 mm., the 

 posterior 2*5 nnn. in length. 



Caudal region with a pair of elongated appendages, about 

 0-03 mm. from the end of the body. Anus 0 63 mm. from the 

 extremity. 



Vulva 0*8 1*15 mm. from the oral end. The long, straight 

 vagina is directed posteriorly and has a length of 8 mm. 



Ovoviviparous. Eggs small and thin-shelled, measuring 

 0-015-0-018 X 0-01 mm. 



Genus Dicheilonema Diesing, 1860. 



DiCHEILONEMA HORRIDUM (Diesiug, 1851). 



Examples of this well-known species were sent to me from the 

 Prosectorium on two occasions ; they were obtained from the body- 

 cavity of Rhea americana. It is a worm commonly i-eported from 

 Zoological Gardens. 



Genus Diplotri.exa Railliet et Henry, 1909. 



The genus Diplotrioma was estal)lished l)y Henry (in Henry 

 and Ozoux, 1909) to include a group of very closely allied species 

 of Filaria from the body-cavities of various birds, cliielly Passeii- 

 formes. They are easily recognised by the presence of a peculiar 

 apparatus in the form of a pair of chitinous ''tridents"' situated 

 in the front of the head, and by the structure of the male 

 spicules, one of which is straight, the other twisted. 



Fifteen species have been referred to this genus ; the majority 

 have, however, been so imperfectly described that their recog- 

 nition is very difficult. The material from the Society's Gardens 

 includes three species which are to be placed in this genus ; two 

 of these I have referred to established species, the third is 

 described as new. Diagnoses of the species of Dvplotricena must 

 be regarded as mei-ely provisional until a thorough revision of all 

 known forms has been made. 



Diplotri.exa tricuspis (Fedtscli., 1883). 



Stossicli's monograph of Filariids (1897) show^s that Filaria 

 tricasjns has been recorded from a large number of ditlerent 

 Birds ; the measurements given in his specific diagnosis make it 

 clear, however, that a number of species have been confused 

 under this name. 



The specimens which I have referred to J), tricus-pis were 

 found in the body-cavities of the White Headed Starling, 



