FILARIA OZZARDI 297 



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. 



Identical larvae have been seen by Manson, Galgey, Low, and 

 St. George Gray in the blood of natives of St. Lucia, and Low 

 found them also in the blood of natives of Dominica and Trinidad. 

 Manson has seen this parasite or one exceedingly like it in the 

 blood of the natives of New Guinea. The larvae of F. demarquayi 

 are indistinguishable from those of F. ozzardi. 



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 connective tissue of the mesentery. Two of these speci- 

 mens were presented to the London School of Tropical Medicine, 

 and described by Dr. Daniels. 



The adult female Filaria demarquayi measures from 65 80 

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

 diameter of from 0-09 0*1 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 sub- 

 terminal. 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 marked cuticular thickening covers the tip of the 

 tail. The diameter near the tip of the tail before its termination 

 is O'O3 mm. F. demarquayi is a thicker worm than F, perstans. 

 It differs from F. bancrofti and F. ozzardi in the greater size of 

 the head, in the smaller tail and particularly in the marked 

 cuticular thickening at the tip of the tail. This thickening is 

 knobby, but the divisions are not so well marked as in F. perstans. 



The male of Filaria demarquayi has still to be found. The 

 intermediary host has not been discovered. The distribution of 

 this filaria is singularly limited both geographically and topo- 

 graphically. L. W. S.] 



7. Filaria ozzardi, Manson, 1897. 



The larvae are found in the blood of natives of British Guiana ; 

 they measure 0*173 0*240 mm. in length by 0*0043 0*0050 mm. 

 in breadth, and have no sheath. The caudal extremity is obtuse, 

 rarely pointed. They appear in the peripheral bloodjat all times of 



