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269) that the eggs are laid on Sargassum or other floating sea-weed, a supposition
which was rather natural.
As far as I have been able to find, only two cases of deposited Halobates-eggsi
have been published. The first publication is from 1886. Witlaczil, who treated
the collections of Halobates from "Vettor Pisani’s" circumnavigation 1882 — 85,
communicates (Wien. ent. Zeitg. V, 1886, 233 and Zool. Anz. X, 1887, 338) that the
expedition south west of the Galapagos Islands found a bird’s feather, the vane of
which, being of a length of 6 centim, was covered on both sides "mit einer
Unmasse von ziegelrothen Eiern". The eggs had a length of 1 mm; they were
supposed to belong to H. splendens Witl., which was found in the vicinity. The next
publication is a short note by Stamm (Vidensk. Meddel, fra Dansk Nat. For.
København, 64, 1913 p. VIII); it mentions quite briefly that in the Zoological Museum of
Copenhagen there is a collection of Halobates-eggs, deposited on different objects
floating in the sea; it is just the material before me, which will be treated more
particularly below; further on it gives the highly interesting information, that
Halobates-eggs were found deposited on a living Noddy (tern-like bird), which was
captured in the Red Sea; this also will be mentioned below.
The material now before me is the following.
From the Atlantic.
No. 1. A Spirula-shell, almost entirely covered with several hundreds of eggs, among
which there is a good deal of Lepas-brood, partly in the Cypris-stage, partly
older. 20° Lat. N., 81° Long W. Hygom.
- 2. Three pieces of sea-weed with eggs; these contain more or less developed
embryos, and there are also a number of empty shells. 20° Lat. N., 81° Long.
W. (Pl. I, fig. 3).
- 3. A Spirula-shell with eggs. 23° 2’ Lat. N.. 31° 48’ Long W. "/lo 1848. Mathiesen.
- 4. A fragment of a Spirula-shell with about a hundred eggs. 24° 30’ Lat. S.,
28° 30’ Long W. 1869. Andrea. (PI. I, fig. 2).
- 5. A large, roundish egg-mass, consisting of thousands of eggs, laid on a cork;
this latter is entirely hidden by the eggs, which are laid above each other
in many layers. The largest diameter of the egg-mass is about 45, and the
smallest 35 centim. All the eggs are alike and without embryos. 14° Lat.
N., 27° Long W. 10/10 1858. Hygom. (Pl. I, fig. 4).
- 6. A longish, somewhat band-shaped egg-mass, consisting of several hundred
eggs; no object is to be seen whereupon the eggs are laid. 6° Lat. N., 26°
Long. W. 5/11 1857. Hygom.
- 7. Two bird’s feathers with a very great number of eggs placed on both sides
of the vane, and along the rhachis. 2° Lat. N., 21° Long. W. Hygom.
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