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My fig. 3 corresponds with the stage figured by Pesta (Zool. Anzeiger, voJ. 42,
No. 9, 29. Aug. 1913, p. 406, fig. 5). The appendage turned towards the pleopode is
in the distal part of its edge of fixation provided with a little bud, later on (figs.
5—6) becoming a large process with a hook in the end. The proximal end of the
petasma has a pair of lappets (figs. 5—6), and the appendage next to the
middleline has been folded (figs. 4—6), at the same time as the edge joining the
corresponding part of the petasma in the other pleopode has been provided with small
hooks, joining with those in the petasma of the other side, quite as in the
maxillipedes of the Isopoda. The 4 buds in the apex of the petasma have grown longer;
a pair of them or at least one (fig. 6) is provided with cleft spines. In one of the
specimens (fig. 4) the petasma ends with 5 appendages, with a little one besides the
4 already mentioned.
Senna’s figs. (l. c. p. 292—93, figs. 4—5) correspond with my fig. 4, but he gives
no description, only referring to his figures.
As may be seen the petasma varies very much with the age, and thus may
not be used as a specific-character. The petasma does not seem to have roused the
interest of carcinologists very much. The best description and figure, as far as I
am aware, are given by S. J. Smith in the “Blake”-Decapoda (Bull. Mus. Comp. Zool.,
Harvard College, vol. 10, No. 1, 1882, p. 99 {Sergestes rohustus), PI. 16 fig. 8); although
he has described the organ in another species, the whole corresponds very well with
my fig. 6.
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