606 BRITISH ORIBA'I'ID^. 



It should be mentioned that since the publication 

 of vol. i Dr. Nalepa, of Vienna, as the result of a careful 

 study of the development of the creature called 

 Trichodactylus anonymus by Berlese, which is one of 

 the Tyroglj/phidce (Berlese's Trichodactylus not being 

 identical with Dufour's earlier genus of the same name, 

 although founded upon it), denies the correctness of 

 Megnin's view as to the entire dissolution of the 

 creature.* 



I have not thougfht it worth while recordino^ the 

 details of the observations made on each specimen, but 

 have selected two typical cases ; the records of a larger 

 number would not have introduced any new facts. 

 I should have continued the observations upon other 

 species had time allowed, but as far as this book is 

 concerned they were cut short by the necessity of 

 publishing vol. ii. 



NOTASPIS BIPILIS. 



April 10th, 1887. — Placed a nymph, lately become 

 inert, in a separate cell. 



11th and 12th. — The contents of the body are 

 shrinking backward toward the hinder end, leaving 

 the cuticle of the rostrum empty ; the muscles of the 

 legs and of the mandibles are shrinking inward and 

 being withdrawn into the body-substance. 



13th and 14th. — The cuticle of the rostrum and 

 legs is now empty ; signs of the formation of new 

 muscles may be seen. 



15th. — The new legs may now be seen forming, not 

 within the old legs ; the new muscles to the mandibles 

 may also be traced, no change has yet taken place in 

 the alimentary canal (which is highly coloured) except 

 its shrinking backward. 



17th. — The colon has broken away from the ven- 

 triculus but remains attached to the rectum. The 



* " Die Anatomie der Tyroglyphen," ii Abtheil., ' Sitzb. k. Akad. d. 

 Wiss./ Wien, 1885, pp. 150—156. 



