CInssiJication of the Arthropoda. 365 



University of Vienna has at length come to the same conclu- 

 sion on this subject as that which I published in 1881, and 

 have taught for many years. But I do not think that it is 

 right that he should present these views to the Imperial 

 Academy of Vienna as originating with him when they are 

 well known to the zoological world as having originated with 

 me, and are totally opposed to the views which he himself 

 has hitherto held and taught in his well-known text-book of 

 Zoology. 



I appeal therefore to the justice of the members of the 

 Imperial Academy of Sciences of Vienna to permit me to 

 publish in the pages of the same Journal in which Prof. 

 Claus has appropriated my views to himself a statement of 

 my claims to the origination of those views. 



I am not able to suppose that Prof. Glaus has indepen- 

 dently come to the same conclusions on this subject as those 

 whicli I have advocated, inasmuch as he received a copy of 

 my memoir, " Limulus an Arachnid," at the time of its 

 publication four years ago, and has lately, in one of his own 

 publications, referred to statements of mine in an essay on 

 the structure of Apus cancriformis , which appeared in the 

 same journal in which that on " Limulus an Aracliuid" was 

 published. This memoir was also issued in conjunction with 

 the latter essay under the separate title "■ Studies on Apus, 

 Limulus, and Scorpio," and was sent by me to Prof. Glaus 

 in that form. Apart from the fact that these memoirs were 

 separately and specially sent to Prof. Glaus by me, I have 

 good reason to believe that he does not neglect to make him- 

 self acquainted with the contents of the ' Quarterly Journal 

 of Microscopical Science,' in which periodical they were first 

 published. I must therefore conclude that my essay " Limu- 

 lus an Arachnid " was known to Prof. Glaus. 



I will now proceed to quote certain passages from Prof. 

 Claus's recent note in the ' Anzeiger ' of the Academy, and 

 compare them with passages from my memoir of four years 

 since. 



I. Prof. Claus says, " the Mites are degraded members of 

 the class Arachnoidea." This view I had already advocated 

 in my little book ' Degeneration ' (Macmillan & Go., London, 

 1880), p. 50. It is also expressed in the memoir " Limulus 

 an Arachnid," where I have classified the Arachnida* in 

 three grades^ viz. : — 1, Htematobranchia, including theGigan- 



* I have since proposed (Trans. Zool. See. vol. xi. p. 379) to modify 

 these terms as follows, viz.: — 1, Delobranchia ; 2, Embolobranchia ; 

 3, Lipobranchia. 



A nn. & Mag. N. Hist. Ser. 5. Vol xvii. 25 



