UO Mr. C. J. With on Clielonethi 



spiral segmentation, but in different ways. In the Arthro- 

 pods there are at least two modifications^ viz. : " the split 

 segment/^ in which the one half of a segment is fused with 

 its fellow half as well as with that of another segment ; and 

 the modification in which the one half of one segment is 

 fused with the opposite half of the following, without having 

 any connexion with its own corresponding half. Both 

 modifications ai'e found in Cei-ceris and an intermediate link 

 in t'lielifer jovunus (PI. VIII. fig. 1 a). The aljuormality of 

 Ch. sculpturatus (PI. A III. tig. 2 a) seems to be somewhat 

 different. Whether the abnormalities mentioned are due to 

 injuries in ilie embryos or later on in life or to quite 

 different causes cannot be decided until a larger number of 

 forms, especially of Myriopods, have been examined. 



Literature. 



The books and papers in -which Clielonethi from the 

 Australian Region have been described or mentioned are the 

 following : — 



(i) A.White. "Description of apparently new Species of Aptera 

 from New Zealand," Proc. Zool. Soc. Loudou, (1849J pp. 3-G. 



(2) E. Simon. " Materiaux pour servir a une Fauue Arachnulogique 



de la Nouvelle Caledonie," C. li. Soc. Eut. Belg-ique, xiii. (1880) 

 pp. 64-75. 



(3) E. Keyserling, L. Koch. Die Aiachniden Australiens, Liefer- 



un<? 32-33 (1885-86). Niirnberg. Ordo Chelonethi, pp. 44-51. 



(4) E. Daday. " Pseudoscorpioues a Nova Guinea," Terme^zetrajzi 



Fiizetek, xx. (1897) pp. 475-480, tab. xi, 



(5) W. J. Rainbow. " The Araclinidau Fauna. Atoll of Funafuti." 



Memoirs Australian Museum, iii. pt. 2 (1897), pp. 105-124, 

 pis. ii.-v. 



(6) R. I. PocoCK. " List of the Arachnida and Myriapoda obtained 



iu Funafuti by Prof. W. J. Sollas and Mr. Stanley Uardiner, and 

 in Kotuma by Mr. Gardiner," Ann. & Mag. Nat. Hist. (7) i. 

 (1898) pp. 321-332. 



(7) E. Simon. " Ergebnisse einer Peise nach den Pacific (Scliauins- 



land, 1896-97), Arachuoideen," Zool. Jahrbiicher, Abth. Syste- 

 matik, xii. (1899) pp. 411-4.37. 



(8) E. Simon. " Contribution a la Faune de Sumatra : Arachnides 



recueillis par M. J. L. Weyers a Sumatra," Ann. Soc. Eut. Bel- 

 gique, xliii. (1899) pp. 78-125. 



(9) E. Simon. Arachnida: Fauna Ilawaiensis, vol. ii. part x. (1900) 



pp. 443-519, pis. xv.-xix. 



The following papers, concerning Chelonctiii from other 

 ])arts of the world to whicli reference is made in this paper, 

 are in alphabetical order : — 



(10) I.. Balzax. "Rovisione dei Pseudoscorpioni del Bacino doi 

 Fiume Parana e Paraguay nell' America meridionale,"' Ann. 



