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•Shell: Length, 1,15 nun. Seen from the side it is rather elongated; pl. XXVIII,
fig. 42, the shell of a female, seen from the side, shows, as has been pointed out above, a type
that agrees fairly closely with the one found by me in the Antarctic.
First antenna: The e-bristle in the male is furnished with ten pairs of spines
of about the same type and position as has been shown by me above.
Rod-shaped o r g a n: The capitulum varies in type; in the male it is sometimes
of the type reproduced by me in fig. 4 above, sometimes almost straight and distally rounded; in the
female types were found that resembled rather closely those found by me in the Antarctic specimens.
No difference is mentioned between the male and female shell nor any variation in the
shape of the shell, nor is any variation mentioned in the armature of the e-bristle on the male
first antenna.
G. W. Müller’s description of this species, 1996 a, is based on specimens from the
Atlantic, Antarctic and Indian Oceans. The following information is given in this description:
Shell: „Von sehr wechselnder Form, das Verhältnis zwischen Höhe und Länge
schwankt zwischen 7? and 7i0“ (i. e. about 1 : 1,75 to-1 : 2,37). ln short specimens the posterior
part oi the shell dominated rather strongly over the anterior part, in the most elongated ones
the anterior part of the shell was about as large as the posterior part. The posterior margin
of the shell was more or less strongly rounded; as a rule the elongated specimens were characterized
by a very decided arcuation, the shorter ones, on the other hånd, had a somewhat weaker one.
First antenna: With regard to the e-bristle it is remarked in the text that it
agrees with this bristle in C. nasotuberculata; in the latter species this bristle is said to be armed
with „etwa“ twelve pairs of spines; in pl. XVII, fig. 34 eleven spines are drawn on this bristle.
Second antenna: To judge from the figures the c- and d-bristles are developed
on the endopodite in the male. For the clasping organs see p. 651 above.
R od-shaped organ: In the male the capitulum is of about the type reproduced
by me in fig. 4 above; in the female this appendage varied within about the same limits as in the
Antarctic specimens investigated by me; cf. p. 654 above.
No information is to be found in this treatise as to whether the variation of the shell
was continuai or whether specimens with different types of shell were found together at the
same localities. The statement quoted on p. 649 above as to the length of the shell perhaps indicates
that the Antarctic specimens investigated by this author were also all characterized by having
elongated shells.
G. H. Fowler, 1909, looks upon the elongated forms as „Stage I“, the short ones as
„Stage li“; cf. p. 567 above. With regard to this question this author writes as follows: „Aecording
to Dr. MULLER, the shells of this species exhibited a remarkable variation in shape, the height
being anything from 41 to 57 per cent. of the length. Now in all other Halocypridae which I have
handled the shell-shape is very fairly constant, and the general contour gives one of the most
reliable specific characters, but its diagnostic value would be seriously weakened if so great
a range of variation were possible as is shown in MULLER’s figures, pl. XVII. 23. 24 and 25. 26.
Fortunately, it appears that this extreme range of possible contour is due, not to individual
variation, but to the different shapes of the shells at Stages 1. and II. So far as I have seen
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