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No. 14. A Sepia-shell with a little more than a hundred eggs. 4° 56’ Lat. N., 106° 6’
Long. E. 22/5 1881. Hartmann. (Pl. I, fig. 5).
- 15. A small piece of sea-weed with eggs. 1° Lat. N., 106° 40’ Long E, 1869.
Andréa.
- 16. A Sepia-shell with half a hundred eggs. 3° 20’ Lat. S., 106° 50’ Long. E. 1869.
Andréa.
- 17, A Sepia-shell with several hundreds of eggs, most of them either containing
embryos or open and empty. Chinese Sea between 4° and 8° Lat. N. 1866.
Caspersen.
- 18. A small piece of floating timber with eggs and larval skins. 4° 30’ Lat. N.,
137° Long. E. 8/1 1875. Caspersen.
- 19. A small piece of vegetable substance with about half a hundred eggs, some
with embryos, ca. 10° Lat. S., 142° Long. E. 1881. Corneliussen.
- 20. A piece of a feather with eggs, all with embryos. The Galapagos Islands.
Received from Dohrn.
Of the 20 specimens named here, four are missing, namely No. 3, 8, 15 and 18 ;
these are noted in the above list according to a card-catalogue, written by
Steenstrup ; as Steenstrup was thoroughly acquainted with Halobates-eggs, there is no doubt
about the mentioned specimens being correctly referred by him.
In the existing material we can distinguish between five different sorts of eggs,
which thus must belong to at least five different species of Halobates; (perhaps to
more, as several species may have quite similar eggs). In all the specimens, whether
they show few or many eggs, all the eggs are similar, and there is nothing which
indicates that the females of different species have laid their eggs together. All the
eggs from the Atlantic localities as well as No. 10, Red Sea, No. 12, 3° 10’ Lat. S.,
89° 51’ Long. E., and No. 20, Galapagos Islands agree, and may thus belong to one
species (Pl. I, fig. 6). They have a length of about 1 mm and a diameter of about
0,4 mm, are of an elongated oval shape and as usual with the ventral side more
arched than the dorsal one, and with the front end a little broader than the posterior.
The egg-shell is not thick, and shows no special structure. In the Atlantic five
species of Halobates occur, but only one of them is common, viz. H. Wullerstorffi
Frauenf., which according to Witlaczil (l. c.) and Dahl (Ergebnisse d. Plankton-Exp.
II, 9 α, «, 6) is identical with H. micans Esch., and this species also appears in the
Indian Sea and the northern Pacific; there is thus some reason for believing, that
the eggs in question belong to this common species. Its eggs are, as mentioned,
described and figured by Buchnan White, who describes the shell without structure,
and states the length to be 1,2 mm and the breadth 0,8 mm; this breadth is, as
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