CHAPTER IV 
CRUSTACEA (CONTINUED): CIRRIPEDIA—PHENOMENA OF GROWTH 
AND SEX—OSTRACODA 
Order III. Cirripedia. 
THE Cirripedes are medium-sized Crustacea, with the body consist- 
ing of few segments, and enveloped in a mantle formed as a fold 
of the external integument, which may be strongly protected by 
calcified plates. The abdomen is greatly reduced. The larva, 
after hatching out as a Nauplius, and passing through a Cypris 
stage, when it resembles an Ostracod, fixes itself to a foreign 
object by means of the first antennae, and becomes a pupa, which 
after profound changes gives rise to the adult. 
All the Cirripedes, when adult, live either a fixed or parasitic 
existence, and as so frequently happens with animals of this 
kind, they have departed widely from the ordinary structure 
of the class to which they belong. Their anomalous appearance 
and the mystery surrounding their propagation gave rise, 
probably, to the old legend that the Barnacles (Lepadidae), 
which live attached to pieces of floating timber hatched out 
into Barnacle geese’; and even so late as 1678, in the Royal 
1 Max Miiller (Science of Language, 2nd series, p. 534) gives references to a 
number of old authors who vouch for the truth of this legend, going back as far as 
Giraldus Cambrensis in the twelfth century. The legend appears to be of Scotch or 
Irish origin. Giraldus complains of the clergy in Ireland eating Barnacle geese 
at the time of fasting under the pretext that they are not flesh; but born of fish 
living in thesea. The form of the legend varies, certain authors alleging that the 
geese are produced from the fruits of a tree which drop into the water, others that 
they grow in shells (Barnacles) attached to floating logs. Aldrovandus (De Avibus, 
T. iii., 1603, p. 174) ingeniously combines both versions in a woodcut representing 
undoubted Barnacles growing on a tree with luxuriant foliage at the water’s edge, 
below which a number of liberated geese are swimming. Miiller ascribes an etymo- 
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