WORMS FROM MAMMALS AND HIRIJS. 499 



measures 0'27 lum., it mIso has the .shape of a tiilie, teniiiiiating 

 in a menibnuioiis, hooked extremity. 



Female 160-250 mm. long, with a greatest thickness of about 

 0'38 mm. Head 0*11 mm. broad. 



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

 posterior 2"5 mm. in length. 



Caudal region with a pair of elongated appendages, about 

 0-03 mm. from the end of the l)ody. Anus 063 mm. from the 

 extremity. 



Yidva 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 

 0-01 5-0-01 8 X 0-01 mm. 



Genus Dicheilonema Diesing, 1860. 

 DicHEiLOXEMA HORRiDUM (Diesing, 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 Ehea americana. It is a worm commonly reported from 

 Zoological Gardens. 



Genus Diplotri.kxa Railliet et Henry, 1909. 



Tlie genus IJiplotrioma was established Ijy Henry (in Henry 

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

 of Filaria hom the body-cavities of various birds, chieHy Fasseii- 

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

 appar;itus in the form of a })air 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 Di'plotruena must 

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

 known forms has been made. 



DiPLOTRi.EXA TRicusris (Fedtsch., 1883). 



Stossich's monograph of Filainids (1897) shows that Filaria 

 iricaspis has been recorded from a large number of difierent 

 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 />. tricusjns were 

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



