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Larvae.
In the case of //. dubia G. W. Müller and its var. major the synonymization is based
on G. W. Müller’s own statements.
I was somewhat doubtful wliether to identify H. pelagica, Ch. JUDAY, 1906, with the
species discussed by me above, because this form comes from the west coast oi America. The
figures given by this writer decidedly support this procedure, however; fig. 5 in plate VII,
according to which the first antenna has six joints — the first joint is divided into two joints
of equal length in this figure — is certainly incorrectly drawn.
The figures of H. inflata and H. globosa given by Tu. SCOTT, 1912 a, are exceedingly deficient
and uncertain, but they indicate with a fair amount of certainty that the former species is
identical with the male, and the latter species with the female, of the form dealt with by me
above. It is to be noted that this writer calls the male reproduced on pi. XIII, figs. 29—31,
a female!
The following synonyms among those included above have no verificatory descriptions
and figures, but, in spite of this, they seemed to me certain for one reason or other: H. concha -f
H. pelagica, G. S. Brady, 1897, H. concha, A. Scott, 1905, H. pelagica, P. T. Cleve, 1905,
H. inflata, G. W. MÜLLER, 1906 b, 1908, H. concha + H. pelagica, V. VA yra, 1906.
On the other hånd it did not seem right to include H. brevirostris, Tu. SCOTT, 1894, p. 141,
a form that is also without any identifying figures or description. The uncertainty in this
in-vestigator’s work of 1912 a, which is pointed out above, seems to be sufficient reason for this.
The larvae of this species found by me in the material of the „Anta rcti c“
Expedition all clearly belonged to the last larval stage. Both males and females were
found. In both sexes the shells were of about the same type as that which is characteristic
of the mature female and showed very slight variation with regard to length; 1.0—1,1 mm.
was observed. The number of furcal claws on these specimens varied from six to seven. Several
of the females among these larvae had eggs in the ovary in a rather advanced state of development,
so that these larvae were rather difficult to distinguish from the mature females, whose eggs
are often no farther developed; the same observation was previously made by G. W. Müller,
1906 a, with regard to the material of the ,,V a 1 d i v i a“ expedition. This faet, like the length
of the larvae, seem to make it probable that the species H. pelagica of several of the preceding
authors represent larval specimens of the species dealt with above.
Habitat: — Atlantic Ocean:
S. A. E., PI. station 30, lat. 29° 52’ N., long. 20° 14’ W.; at the surface; 7. XI. 1901;
temperature, 21,1° C.: 1 mature male; R. M. S. 199. S. A. E., PI. station 4 b, lat. 25° 51’ N.,
long. 21" 29’ \V.; at the surface; 9. XI. 1901; temperature, 22,5° C.: 3 mature males and 7 larvae;
R. M. S. 189. S. A. E., PI. station 38, lat. 25° 46’ N., long. 21° 31’ W. ; at the surface; 9. XI.
1901; temperature, 22,5° C.: 1 mature male; R. M. S. 200. S. A. E., PI. station 6b, lat.
23° 35’ N., long. 22° 19’ W.; at the surface; 10. XI. 1901; temperature, 23° C.: 1 mature
male; R. M. S. 190. 8. A. E., PI. station 7 b, lat. 22° 26’ N., long. 22° 45’ W.; at the surface;
11. XI. 1901; temperature, 23,6° C.: 1 mature male; R. M. S. 191. S. A. E., PI. station 45,
lat. 22" 8’ N., long. 22° 52’ W.; at the surface; 11. XI. 1901; temperature, 23.3° C.: 1 mature
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