ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 621 



13. Myriopoda. 



New Termitophilous Millipede.* — S. Hirst describes Termitodesmus 

 hfroyi sp. n., found by Maxwell Lefroy in the mounds of Termes obesus 

 Rawl. at Cuttack, Bengal. It belongs to a new genus recently estab- 

 lished by Silvestri for two new Millipedes found by Escherich in the 

 nests of T. obscuriceps Wasm. in Ceylon. 



Doubling of Segments in Myriopods.f — Jules Chalande points out 

 that while one may theoretically regard the double ring of the Millipede 

 as due to the fusion of two somites originally separate, this view is not 

 supported by the facts. In the post-embryonic development of Centi- 

 pedes there is a complete doubling of segments, and in Glomeris (a 

 Millipede) there is a partial doubling of the ventral plates. At each 

 stage of the post-embryonic development of a Chilopod a new ring arises 

 between the penultimate ring and the anal ring ; soon afterwards two 

 pairs of appendages appear ; and then the ring divides into two segments. 

 In Millipedes all the rings except the thoracic show their duality, but 

 remain undivided. A series of stages may be worked out — Sympliyla. 

 G-eophilidas, Lithobiidre, and Scolopendridse — showing the evolution of 

 the double segments of Centipedes. 



8. Arachnida- 



Development of Ischnocolus.i — Ludmilla and W. Schimkewitsch 

 continue their study of this representative of the Tetrapneumones. The 

 young spiders have at first untoothed claws on the pedipalps and limbs, 

 and the basal joint of the cheliceras has no teeth. The arrangement of 

 the eyes is not the same as in the adult. The invaginations of the 

 body-wall, which form insertions for muscles, are described. 



In a later stage the claws of the limbs and pedipalps become 

 pectinate, and teeth appear on the basal joint in the cheliceraB. After a 

 moult, a piece of endoskeleton appears between the basis of the cheliceraj 

 and the basis of the pedipalps. The limits of the ganglia can be detected 

 in the cephalothoracic mass. The development of the gut and the 

 vascular system is also discussed. 



Fresh-water Mites of Clare Island. § — J. N. Halbert records eighty 

 species of Hydracarina from two collecting expeditions in Clare Island. 

 Twelve species are recorded for the first time from the British area. 

 Both cosmopolitan and northern forms are well represented in Clare 

 Island. Thus Lebertia fimbriata Sig. Thor and Oxi/s plan fan's Sig. Thor 

 have hitherto been found only in Norway. Four new species are de- 

 scribed : Eylais relicta, Front ipoda carpenteri, Atractides (Torrenticola) 

 brevirostris, and Unionicola (Atax) rivularis. 



Pseudoscorpiones of Clare Island. || — H. Wallis Kew found that 

 false-scorpions were unusually scarce in Clare Island, probably because 



* Ann. Nat. Hist., viii. (1911) pp. 256-7 (1 fig.). 

 t Comptes Rendus, clii. (1911) pp. 1345-7. 



X Bull. Acad. Imp. Sci. St. Petersbourg (1911) No. 10, pp. 775-90 (1 pi. and 

 20 figs.). 



§ Proc. R. Irish Acad., xxxi., pt. 39 (1) 1911, pp. 1-44 (3 pis.). 



|| Proc. R. Irish Acad., xxxi. (1911) Clare Island Survey, pt. 38, pp. 1-2. 



Oct. 18th, 1911 2 S 



