Bathymetric Distribution — Alvarino 
485 
TABLE 4 
Species in 
the 300-235 M 
Layer, Coincident with 
the Deepest Scattering Record (Night) 
CONCENTRATION OF INDIVIDUALS PER 10,000 M 3 OF WATER 
filtered 
GROUP 
GREATER 
THAN 5,000 
4999-500 
499-50 
less than 50 
Chaetognatha 
S. decipiens 
S. bierii 
S. hexaptera 
S. scrippsae 
K. subtilis 
S. enflata 
S. maxima 
5“. zetesios 
Siphonophorae 
M. atlantica 
L. conoidea 
Ch. appendiculata 
L. achilles 
L. havoc k 
L. multicristata 
St. bijuga 
B. elongata 
A. ernes ti 
R. plicata 
Medusae 
A. wyvillei 
P. hyacinthina 
Ctenophorae 
Beroe spp. 
phora hydrostatica) were observed at the levels 
of scattering. It is also probable that the head 
armature (hooks, teeth, and chitinous plates) 
of the chaetognaths will contribute to scattering. 
REFERENCES 
Alvarino, A. 1964^. Bathymetric distribution 
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1964 A Zoogeografia de los Queto- 
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1965^. Chaetognaths. Oceanography 
and Marine Biology: Annual Review 3:115— 
194. 
1965 A El Mar de Cortes: Quetognatos, 
Sifonoforos y Medusas. Proc. Second Mex- 
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1965c. Distributional Atlas of Chaeto- 
gnatha in the California Current Region. 
CalcOFi Atlas 3, pp. 1-291. 
1966^. Zoogeografia de California: 
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1966A A new Siphonophora, Vogtia 
kuruae, n. sp. Pacific Sci. 21(2): 236-240. 
McGowan, J. A., and D. M. Brown. 1966 . A 
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Univ. Calif. Scripps Inst. Ocean. 66-23, 
pp. 1-50. 
Moore, H. B., and E. G. Corbin. 1956. The 
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pressure on the vertical distribution of zoo- 
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