THE ANNALS 
AND 
MAGAZINE OF NATURAL HISTORY. 
[FOURTH SERIES. ] 
«ii UTED, ape per litora spargite muscum, 
Naiades, et circiim vitreos considite fontes: 
Pollice virgineo teneros hic carpite flores: 
Floribus et pictum, divee, replete canistrum. 
At vos, o Nymphe Craterides, ite sub undas; 
Ite, recurvato variata corallia trunco 
Vellite muscosis e rupibus, et mihi conchas 
Ferte, Dez pelagi, et pingui conchylio succo.” 
N. Parthenii Gianettasiét Ecl. 1. 
No.1. JANUARY 1868. 
atta 
——_ 
L—On the Structure of the Mouth in Sucking Crustacea. 
By Prof. J. C. ScH16DTE*. 
[Plate L] 
Part I. CymMoTHo#. 
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 aorta 
the severest test of our knowledge of the principles which 
overn the structure of the mouth in Articulata generally. 
he 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 Pl. I. are copied. 
Ann. & Mag. Nat. Hist. Ser.4. Vol. i. 1 
