Classification oj the Arlhi-opoda. 65 



from him the notion that the first Crustacean antenna is a 

 postoral member. " I do not think it improbable/' he does 

 not hesitate to say, " that at some future date Prof. Chius 

 may adopt the view which I have advocated as to the first, just 

 as he has adopted it in regard to the second pair of Crustacean 

 antennae ; and I am therefore anxious to take the present 

 opportunity of insisting upon an important piece of evidence 

 in its favour which has come to light through my researches 

 on the relationship of Limulus to the Arachnida." Then 

 follows a precious piece of argumentation, which furnishes a 

 striking evidence as to the method of work adopted by our 

 author, and by which the postoral interpretation of the ante- 

 rior Crustacean antenna is to be proved. The " brick-red 

 glands " of Limulus and the corresponding coxal glands of 

 Scorpio and Mygdh are segmental organs, and, indeed, 

 according to Ray Lankester's latest investigations, the equiva- 

 lents of the shell-glands of the Entomostraca, which, as is well 

 known, open outwards on the second pair of maxillae. Now, 

 according to GuUand's and Kingsley's statements, the brick- 

 red gland of the young Limulus opens in the basal joint of 

 the fifth pair of appendages ; consequently this pair of limbs 

 corresponds to the second pair of maxilhe of the Entomo- 

 straca; and as this also represents the fifth appendage, the 

 first pair of appendages of Limulus and the Arachnoidea 

 represents the first pair of antennas of the Crustacea, conse- 

 quently this is the first postoral pair of appendages, quod erat 

 demonstrandum ! If the " brick-red gland " of Limulus were 

 really homologous with the shell-gland of the Crustacea, the 

 Arachnid theory of Limulus would be in a truly bad way ! 



In the preceding statement I have not only proved the 

 falsity of the charges which Prof. Ray Lankester has brought 

 against me, but I also believe that I have demonstrated the 

 method which he has employed in order to make these charges 

 seem plausible to the impartial reader who may not be 

 thoroughly well informed upon the subjects. It is the same 

 method which the honoured English author makes use of in 

 his scientific works in order to build up the famous results of 

 his remarkable deductions by means of the most extraordinary 

 speculations without a sufficient foundation of facts. But 

 while these must often serve to amuse the judicious reader, 

 the grave charges against a colleague have a veiy serious 

 side. Now that the proof of their absolute falsity has been 

 given, the reproach of at any rate frivolous suspicion falls all 

 the more heavily upon the originator of the accusations — a 

 reproach from which a respectable man can only clear himself 

 by simple and honourable revocation. 



Ann. iSc Mag. N. Hist. Ser. 5. Vol. xviii. 5 



