APROCTINAE 205 



alae, which are continuous posteriorly and supported by four 

 to six pairs of preanal and five or six pairs of postanal papillae. 

 Spicules unequal and dissimilar. The middle portion of each 

 spicule is alate, while the smaller bears on the inner side of 

 its distal part a row of serrations. Vulva close to the anterior 

 end of the body. Eggs thick-shelled, containing embryos in 

 utero. 



Hab. Serous cavities of Birds of prey. 

 Genotype : S. turkestanicum Sltrjabin, 1915. 



Skrjabin, 1915, Vestn. Obshest. vet., Petrograd, 133 ; 1916, 

 Attn. Mus. Zool., Petrograd, xx, 546; Seurat, 1915, Novit. 

 Zool., London, xxii, 23. 



Subfam. 3. APROCTINAE Yorke & Maplestone, 1926. 



Cuticle thin. Oesophagus atypical, relatively short, not 

 divided into anterior and posterior regions. Intestine dark- 

 coloured. Anus usuallj'^ not functional, sometimes absent. 

 Tail of male short, bluntly rounded, without alae and usually 

 without prominent papillae. Spicules short, equal or subequal. 

 Adults in connective tissue of Birds or Reptiles. 



1. Aprocta v. Linstow, 1883. 



Syn. Lissonema v. Linstow, 1903. 



Cuticle smooth. Mouth small, without papillae. Ex- 

 cretory pore absent. Anus frequently absent, and when 

 present usually not functional. Tail of male without papiUae. 

 Spicules equal or subequal. Vulva in oesophageal region. 

 Uterine branches parallel. Ovaries and oviducts posterior. 

 Eggs small, thick-shelled, containing embryos in utero. 



Hab. Orbit and nasal cavities of Birds. 

 Genotype : A. cylindrica v. Linstow, 1883. 



V. Linstow, 1883, Arch. f. Naturg., xlix, i, 289 ; 1903, ArcJi.f. 

 mikr. Anat., Ixii, 117; Railliet & Henry, 1910, Bull. Soc. 

 Path, exot., Paris, iii, 152; Skrjabin, 1917, Compt. rend. Soc. 

 Biol., Paris, Ixxx, 303. 



Morphologically there seems to be very little difference 

 between this genus and the two following genera, Thamugadia 

 and Eufilaria. We have retained these genera provisionally, 

 chiefly on account of the differences stated to exist in the eggs 

 and embryos. Eufilaria contains only two species and 

 Tlmmugadia one, and it seems not improbable that they 

 represent no more than specific differences within the genus 

 Aprocta. The alimentary canal in all three genera appears to 

 be extremely degenerate, and we do not, therefore, attach 

 great significance to the peculiar structure of the oesophagus 

 in Eufilaria. 



