ALCIPPE LAMP AS. 5fil 



protruded (m) was by itself rather longer than the whole 

 animal; and as this specimen had been placed in spirits of 

 wine, the organ no doubt was contracted ; hence I think it 

 probable that the probosciformed penis, when fully stretched 

 out, would equal twice the length of the entire animal. 



There must be a nervous system ; and there must like- 

 wise be a gland (homologous with the ovaria) for secreting 

 the cement; but I could not distinguish parts so small. 

 Certainly there is no mouth, or stomach, or thorax, or 

 limbs of any kind, or abdomen. 



It is obvious that these males must be very short-lived : 

 they perform their masculine functions and then perish. 

 We have seen, however, that after the act of metamor- 

 phosis they do grow a little, and I have reason to suspect 

 that this is effected, as with other Cirripedes, by moulting. 

 The growth must be absolutely dependent on the store of 

 nutriment laid up within the pupa. The young male, im- 

 mediately after the exuviation of the integuments, thorax, 

 natatory legs, abdomen, and eyes of the pupa, consists of 

 a pulpy cellular mass, without any internal organs as yet 

 formed. 



Judging from the different sizes of the females which 

 included perfectly developed ova, I infer that they must 

 breed more than once during their lives; and therefore, that 

 successive sets of males, as in the genus Scalpellum, must 

 become attached to them. I was not, however, able to dis- 

 cover the prehensile antennae or other remains of the old 

 males adherent to the females; a circumstance which I pre- 

 sume is accounted for by their attachment being weak. 

 Considering the very small size of the male, it is not sur- 

 prising that so many, — in one case fourteen, — are required 

 to impregnate the numerous ova of a single female. How 

 the males know the proper period when the ova, lying in a 

 sheet at the very base of the sack of the female, are ready 

 for impregnation, I cannot say, without it be that they per- 

 ceive the moulting of the external membrane, close to the 

 edge of which they are attached ; for this moulting would 

 indicate the period when the ovigerous lamella came to the 

 surface of the sack, and the ova would then be soon ready for 

 impregnation. From the position in which the males are 



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