386 SUMMARY OF CUKKENT KESEARCHES RELATING TO 



an endodermal layer. Complete coalesceuce subsequently takes place 

 l)etween all the cells of the embryo, this resulting in the formation of a 

 syncytium in which the rudiments of organs first appear as a marshalling 

 and multiplication of nuclei. The author inclines to adhere to his 

 view that the Histriobdellidai have some notable resemblances to Rotifera. 



Nematohelminthes. 



Anomaly in Buccal Apparatus of Ascaris megalocephala.* — Emile 

 Andre describes a peculiar condition in one out of thirty-seven speci- 

 mens taken from the intestine of a horse. The three lips were re- 

 placed by four soft, flat, muscular, appendages in the form of languets. 

 They were 1-1-15 mm. in length, 2 mm. broad at the base, and tapering 

 to a thread. A fine longitudinal striation was due to the muscle-fibres 

 moulding the delicate cuticle. The worm could not have attacked the 

 mucous membrane of its host either for nourishment or fixation. 



Genus Tanqua.f — H. A. Baylis describes Tanqua diadema sp. n., 

 from the intestine of the South American fresh-water snake, Helicops 

 angidatus. The type-species, T. iiara (v. Linst.) occurs in monitors 

 {Varanus) and some semi-aquatic snakes. A third species, T. anomala 

 (v. Linst.), from the stomach of Tropidonotus piscator, was described by 

 von Linstow as Heterakis anomahi. The genus is one of the Gnatho- 

 stomidae. On each of the two lips there are three rounded tooth-like 

 projections, and the teeth of one lip can interlock with those of the other. 

 At the base of the head there are four rounded submedian cuticular 

 swellings with transverse striations. The cuticle is thick, and may Ije 

 loosened anteriorly, forming a protective sheath. There are four 

 elongate cervical glands, opening to the exterior on the basal portion of 

 the head. The tail of the male has eight pairs of elongate papilla?. 



Oxyuridae.^ — A. Railliet and A. Henry present a synopsis of this 

 family of Nematodes. Their system is based primarily on the spicules, 

 secondarily on the position of the vulva. Five sections are recognized : 

 (1) with a single spicule and no accessory piece ; (2) with a spicule and 

 an accessory piece : (:>) with two equal spicules ; (4) with two equal 

 spicules and an accessory piece ; (o) with two unequal spicules and 

 accessory piece. 



Nematodes and Other Worms from Falkland Islands. § — H. A. 



Baylis reports on three Nemertines, seven Nematodes, and an Enchytra^id 

 collected by Mr. Rupert Yallentin in the Falkland Islands. The 

 Nematodes include Stenolnimus serinUs sp. n., the chief peculiarity of 

 which is that instead of the pair of circular or spiral lateral organs near 

 the anterior end in the majority of free-living Nematodes, there appears 

 to be on either side a longitudinal row of thirty or more very small pits 



* Rev. Suisse Zool., xxiv. (1916) pp. 351-3 (2 figs.). ' 

 t Aim. Mag. Nat. Hisfc., xvii. (1916) pp. 223-32 (4 figs.). 

 t C.R. Soc. Biol. Paris, Ixxix. (1916) pp. 113-5. 

 § Ann. Nat. Hist., xvii. (1916) pp. 288-98 (4 figs.). 



