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While working up the enormous material of Crustacea collected by the Danish
research-steamer “Thor” during recent years in the Mediterranean and the
adjacent parts of the Atlantic[1], I observed in the autumn of 1912, that 2 specimens
of the Mastigopus-stage of Sergestes vigilax had copulatory organs. This is, as far as
I am aware, the only known occurrence of such organs in non-adult Decapoda, though
it is evident that large organs with so complex a structure cannot suddenly appear
in the adult stage, but that several moultings are necessary to give them their shape.
When I found these organs, I was not aware that they were known already,
and searching in the Zoological Record I could not find information about them.
Later on, for quite other reasons, I asked Dr. Angelo Senna in Florence to send
me some papers on the Mediterranean Crustacea, and in one of these papers (Le
esplorazioni abissali nel Mediterraneo del R. Piroscafo Washington nel 1881, II, Nota
sui Crostacei Decapodi; Bolletino della Societa entomologica Italiana, Anno XXXIV,
Trimestre IV, 1902 (1903), PI. 11, fig. 8) I found a figure of the copulatory organ
of the Mastigopus of the species in question. In the same ])aper (p. 292 — 93) Senna
has given figures of the organ of the adult, and now recently also Dr. Otto Pesta
in Vienna has given another figure (Zool. Anzeiger, vol. 42, No. 9, 29. Aug. 1913, p. 406).
My own investigations however have not therewith been rendered useless, my
material being much larger than what has been at the disposal of the two authors
mentioned; for I am able to give a complete series of the development.
| 1. Petasma of the Mastigopus-stage (fig. 1—2). |
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