136 p. MANSON ON MICRO-FILARI^, WITH 



" Male— Length f" 



Greatest diameter -rW 



1 6 O 



Diameter of neck -^^" 

 Length of oesophagus ^-^" 

 Diameter of alimentary canal -^q" 



" The body in both sexes is smooth and very transparent. Moiitli 

 simple. (Esophagus very wide near its termination in the intestine. 

 Spicules double. No papilla. Tail tapering to blunt extremity. 

 Testicle extends to near oesophagus where it is doubled on itself. 

 Arms close to end of tail. 



" Female— Length f' to 1" 

 Diameter ^^" 



" General appearance the same as the male. The vagina spans 

 about yi^" from the mouth. If the female is placed in a suitable 

 medium such as aqueous humour, she retains her vitality for some 

 time, and the movements of parturition can be distinctly seen. At 

 short intervals a peristaltic contraction commencing in the uterine 

 horns and increasing in force as it descends to the vagina expels 

 every few seconds a small group of embryos of the blunt-tailed 

 hooded description. A section of the worm some distance from the 

 vagina permits the escape of embryos, plainly showing the 

 gradations of stretching that converts the chorional membrane into 

 the sheath of the free embryo (see illustration). Do you consider 

 the sharp tailed, vigorous and larger heematozoa of the same species 

 and advanced in development as specifically distinct ? 



" HcBmatozoa of Gracupica nigricollis. — This bird harbours two, if 

 not three, distinct sj)ecies of ha^matozoa. One, such as I have 

 described in the paper, I send you, measuring about -^" by -g-sVo"? '^^^^^ 

 a tail not quite sharp, very vigorous and destitute of lash or hood. 

 Another measuring in length y^o", and a third kind (associated 

 with the valve worm), -^^-q" by ^g^o') probably the same as those of 

 Pica media — though offspring and parents were more minute in the 

 birds I have examined. The valve worm is exactly like that of 

 Pica media, having the characteristic bosses studding its integument. 



" Hwmatozoa of G our a coronata. — This bird comes from the Malay 

 Archipelago. It lived in confinement in China for almost a year, 

 but last winter died — apparently from cold. Its blood contained a 

 fair pr()j)ortion of hajmatozoa with head and tail lashes exactly 

 like those of F. sanguinis hominis. I examined the heart, large 



