58 



Cameron (A. E.). The Oviposition Habits of Gastrophilus namlis, L. 

 — Science, Lancaster, Pa., xlix, no. 1253, 3rd January 1919, p. 26. 



In commenting on a paper by Dr. Townsend on the oviposition 

 of Gastrophilus nasalis, L. [see this Revieiv, (Ser. B, vi, p. 189], the 

 author points out that the eggs of G. nasalis and G. intestinaUs are 

 absolutely distinct both as regards shape and method of attachment 

 to the hairs, the former being certainly not adapted for the penetration 

 of the skin of the host. Oviposition on the hairs of the throat is almost 

 invariable, as many as 68 eggs having occasionally been found on 

 a single hair, and the author has never seen the adult fly strike at 

 the hps, and certainly never to oviposit there. He further adds 

 that the view that the egg is retained in the skin after insertion by 

 means of its transverse striations is purely fictitious. 



Seurat (L. G.). Contribution a I'Etude de la Faune Parasitaire de la 

 Tunisie. Nematodes. [Contribution to the Study of the Parasite 

 Fauna of Tunis. Nematodes.] — Arch. Inst. Pasteur, Tunis, x, 

 no. 4, December 1918, pp. 243-275. 



This paper deals at length with the parasitic Nematodes of Tunis. 

 Among those mentioned are Dirqfilaria immitis, occurring in the blood 

 of the dog, and Filaria bancrofti. Anopheles algeriensis, Theo., being 

 the intermediate host in both cases. 



Ohatton (E.) & Blanc (G.). Predilection du Rhipicephalus sanguineus 

 pour le Gondi. Son Role probable de Vecteur de la Toxoplasmose. 



[Predilection of Rhipicephalus sanguineus for the Gundi. Its 

 probable Eole as Vector of Toxoplasmosis.] — Arch. Inst. Pasteur, 

 Tunis, X, no. 4, December 1918, pp. 281-282. 



In a previous memoir [see this Review, Ser. B, vi, p. 27] the reasons 

 are indicated that lead to the conclusion that Rhipicephalus sanguineus 

 is the invertebrate host of the Toxoplasma of the gundi \Ctencdnctylus 

 gumli], and perhaps of the greater part of those occurring in mammals. 

 These can now be stated as :— (1) The ecological ubiquity of the tick 

 among its hosts, of which three species are spontaneously infested by 

 toxoplasmosis, viz. :— the dog, rabbit, gundi, and probably also the ox ; 

 (2) the migration of the tick from one host to another between its 

 various moults ; (3) the frequent occurrence of larvae and especially 

 of nymphs of the tick on gundi captured in the open. In captivity 

 gundi rapidly lose the ectoparasites which they bear in a state of 

 natm^e, and there is good reason for thinking that the toxoplasmosis 

 developed by them at the Pasteur Institute of Tunis was not brought 

 by them from their place of origin, but was contracted from other 

 animals in the Institute., by means of the tick. Dogs in particular 

 perhaps acted as a source of virus, a kennel proving to be heavily 

 infested with R. sanguineus in all stages of development. 



In the course of breeding experiments with eggs laid by females 

 taken from the dog, failing young and hairless mice, the larvae were 

 placed on adult mice that had been shaved. Under these conditions 

 very few of the larvae attached themselves, and of those which did 

 so, many failed to engorge fully. When, however, gundi without 

 any previous preparation were substituted for the the mice, larvae 

 readily attached themselves and practically all became fully engorged. 



