FILARIA DEMARQUAYI 403 



analysis has been made in the hope of acquiring more extended 

 observations similar to those made by Bahr. 



Geographical Distribution. Filaria bancrofti is known in nearly all 

 tropical countries. It occurs in India, China, Indo-China, Japan, 

 Australia, Queensland, the Islands of Polynesia (with the exception 

 of the Sandwich Islands), Egypt, Algeria, Tunis, Madagascar, Zanzi- 

 bar, Sudan, etc., the south of the United States of America, Brazil, 

 the Antilles, etc. Whether it is the same species in all cases is 

 questionable. 



Filaria demarquayi, Manson, 1895. 

 Syn. : F. ozzardi, Manson, 1897. 



The adult female F. demarquayi measures from 65 to 80 mm. 

 in length by 0*21 to 0*25 mm. in breadth. The head has a diameter 

 of from o'09 to o - i mm. The mouth is terminal. The genital 

 pore opens at 0*76 mm. from the head. The alimentary canal is 

 nearly straight and terminates in an anus, which 

 is subterminal. The opening of the anus is 

 marked by a slight papilla. The tail is curved. 

 It rapidly diminishes in size just below the anal 

 papilla. A characteristic pair of fleshy papillae 

 project from the tip of the tail. The diameter near 

 the tip of the tail before its termination is 0*03 mm. 

 F. demarquayi is a thicker worm than Ac. perstans. 

 It differs from F. bancrofti in the greater size of 

 the head, in the smaller tail, and particularly in the FlG - ***& 



^ J quayi : tail, showing 



marked fleshy papillae at the tip of the tail. These paired large fleshy 

 papillae are knobby, and not simply cuticular as pa P ill3e ' ( Afte 'Lei P er.) 

 in Ac. perstans. 



The male of Filaria demarquayi has still to be found. 



The adult female form of F. demarquayi was found by Dr. Galgey 

 in the body of a native of St. Lucia in whose blood the larvae had 

 been found during life. Five adult females were found in the con- 

 nective tissue of the mesentery. 



The larva measures 200 JJL in length by 5 //, in breadth ; it is sharp- 

 tailed, and has no sheath. Its movements are very active, and the 

 absence of a sheath enables it to glide along freely all over the slide. 

 It observes no periodicity, being present in the peripheral circulation 

 both by day and by night. As a rule, some eight or ten parasites are 

 found in an ordinary preparation. Sometimes hundreds of these 

 larval filariae may be counted on every slide. 



The intermediate host has not been discovered. 



Geographical Distribution. St. Vincent, Dominica, Trinidad, and 

 St. Lucia (West Indies), British Guiana, New Guinea (?). 

 26* 



