Full resolution (JPEG) - On this page / på denna sida - Sidor ...
<< prev. page << föreg. sida << >> nästa sida >> next page >>
Below is the raw OCR text
from the above scanned image.
Do you see an error? Proofread the page now!
Här nedan syns maskintolkade texten från faksimilbilden ovan.
Ser du något fel? Korrekturläs sidan nu!
This page has never been proofread. / Denna sida har aldrig korrekturlästs.
In a footnote on the sanie page the author adds: „Since this was written, I have mea sured
the two specimens of ,,lacerta“ taken by the „Research“ in the Faeroe Channel (Proc.
Zool. Soc. 1903, p. 122) and now in the British Museum. They were females of 2,0 mm. in length.“
With regard to other species of the family Halocypridae that are dealt with in this work
we may note the following:
In the case of three species, C. elegans G. O. Sars, C. rotundata G. \V. MÜLLER and
C. curta J. LUBBOCK it was impossible for the author to set satisfactory average lengths for the
different stages because the curves for these were overlapping, p. 263: „the differences in length
between the successive stages are so small that measurement to on ly one place of decimals
does not bring out clearly the boundaries between stages . . . .“ The average values obtained
by approximation agreed very well, however, with BROOKS’s law. Cf. pp. 263, 274 and 261.
Conchoecia magna C. Claus, p. 268, gave less satisfactory results. G. H. Fowler himself
tries to explain this by the impurity of the material; no attempt is made to fit this species in
with BROOKS’s law.
It is true that three stages both of males and females were found of Conchoecia loricata
(C. CLAUS), p. 267, but the specimens of Stage III were „too few to give satisfactory
growth-factors“. Only four specimens of this stage were caught, two males and two females. The
following average lengths were found: — Females: Stagel, 2,58mm., Stage II 2,0mm., Stage III,
1,3 mm. Males: — Stage I, 2,31 mm., Stage II, 1.75 mm., Stage III, 1,2 mm., These average
figures give the following coefficients of growtli: — 2,58 : 2,0 = 1,29; 2,0 : 1,3 = 1,54.
2,31 : 1,75 = 1,32; 1,75 : 1,2 = 1.46.
With regard to Conchoecia ametra G. W. MCl.LER p. 259 the individuals that were caught
were also too few to give satisfactory growth-factors; three stages of both sexes were found.
Stated means in mm. :
Number of specim. measured:
Stage II. Stage III. Stage IV.
? c? ? å ? <3
3,30 3,10 2,3 2,16 1,42 1,6
11 4 1 3 5 1
From these means the following growth-factors are arrived at: — 3,30 : 2,3 = 1.43;
2,3 : 1,42 = 1,6. — 3,10 : 2,16 = 1,43; 2,16 : 1,6 1,35.
Of three species probably onlv two stages were captured; these species were: Conchoecia
inermis (C. Claus), p. 267, C. brachyaskos G. W. Müller p. 259, and C. spinirostris C. Clais
p. 276.
As to the last-mentioned species G. II. FOWLER remarks p. 276: „MÜLLER lias
des-scribed and figured (Naples Monograph, p. 183, pi. XXXI\ . figs. 1. 2, 3. 5) four young stages
of this species, of which the two older at least were males; .... Measured without the
rostrum, they were 0,33, 0,44. 0,59, 0,79 mm. Now 0,33 x 1.35 0,44; 0,44 x 1,35
0,589 (0,59); 0,589 X 1.35 = 0,79; these are therefore related as in other species.“
Some species were represented by one stage only, viz. Archiconchoecia cucuUata
(G. S. Brady), p. 279, Conchoecia pusilla majar G. A . Mül i KR, p. 272. < ’. kampta < !. \\. Mi li.kk.
p. 240 and C. tyloda G. W. MÜLLER, p. 253.
Zoolop. bidrug, Uppsala. Suppl.-Bd. i.
<< prev. page << föreg. sida << >> nästa sida >> next page >>
