THE ANNALS 

 MAGAZINE OF NATURAL HISTORY. 



[FOURTH SERIES.] 



" per litora spargite museum, 



Naiades, et cireum vitreos considite fontes : 

 Pollice virgineo teneros hic carpite flores : 

 Floribus et pictum, divas, replete canistrum. 

 At vos, o Nymphse Craterides, ite sub undas ; 

 Ite, recurvato variata corallia trunco 

 Vellite muscosis e rupibus, et mihi conchas 

 Ferte, Dese pelagi, et pingui conchylio succo." 



N.r ■' — " 



. Farthenii Q-ianettaaii Eel. 1. 



No. 1. JANUARY 1868. 



I. — On the Structure of the Mouth in Sucking Crustacea. 

 By Prof. J. C. ScHioDTE*. 



[Plate I.] 



Part I. Cymotho^. 



1. The peculiar arrangement of the mouth in sucking Con- 

 dylopoda being the result of a more or less complete fusion 

 and metamorphosis of the organs that compose the mouth 

 in those which bite their food, we may regard the interpre- 

 tation of the elements of the sucking-apparatus as affording 

 the severest test of our knowledge of the principles which 

 govern the structure of the mouth in Articulata generally. 

 The demands which this difficult task makes upon our know- 

 ledge are so great that, in undertaking it, one cannot be long 

 before discovering how little is gained in physiology, mor- 

 phology, or natural systematic arrangement by even a very 

 accurate knowledge of the structure of the various organs of 

 the mouth in masticating Condylopoda alone. An analysis of 

 these organs, which aims at nothing more than such a know- 

 ledge, may supply material for artificial classification ; but a 

 truly scientific solution of the problem before us requires more, 

 viz., on the one hand, a true estimate of the mode of coopera- 



* Translated from ' Naturhistorisk Tidsskrift,' series 3. vol. iv. Copen- 

 hagen, 1866, with two plates, from which the outlines on PI. I. are copied. 



Ann. & Mag. Nat. Hist. Ser. 4. Vol.i. 1 



