Two New Chaetognaths from the Pacific 
Angeles Alvarino 1 
The present paper deals with two species of 
chaetognaths observed when working on the 
distribution of this group in California waters, 
and on their relation to the hydrographic condi- 
tions of the area. The material was collected by 
the California Cooperative Oceanic Fisheries 
Investigations (CalCOFI) off the coast of Cali- 
fornia, a project sponsored by the Marine Re- 
search Committee of the State of California. 
Acknowledgments. I wish to thank Dr. M. 
W. Johnson, who has given me a great deal of 
valuable advice and many helpful suggestions 
during the preparation of this paper, and who 
has also corrected the typescript and provided 
1 Scripps Institution of Oceanography, University of 
California, La Jolla, California. Manuscript received 
July 22, 1959. 
space for me in the Marine Invertebrates De- 
partment to carry out my work on zooplankton. 
I am also greatly indebted to Dr. R. Revelle and 
Professor J. D. Issacs for their interest in pro- 
viding an opportunity for me to work and con- 
tinue my research at this Institution. I also offer 
my sincere thanks to Gail Holden Theilacker 
for doing the drawings contained in this paper. 
Sagitta bierii n. sp. 
The body is rigid and slender, retaining its 
cylindrical shape. It is transparent, so that the 
ovaries are easily seen and the gut appears as a 
dark straight line along the body. The small 
head is attached to a long narrow neck which 
gradually broadens out into the body, which is 
widest at the level of the ovaries. The shape 
TABLE 1 
Measurements of Sagitta bierii n. sp. 
NUMBER 
OF 
SPECIMENS 
TOTAL 
LENGTH, 
MM. 
TAIL LENGTH, MM. 
OVARY LENGTH, MM. 
HOOKS 
ANTERIOR TEETH 
POSTERIOR TEETH 
Median 
Range 
Median 
Range 
Mode 
| Range 
Mode 
| Range 
Mode 
Range 
2 
17.0 
3.5 
3.5 
(3. 0-4.0) 
( 
5 
( 
5 
(14-16) 
6 
16.0 
3.2 
(3.0-3.5) 
2.5 
(1.3 — 4.5 ) 
( 
5 
6 
(6-8) 
14 
(12-16) 
18 
15.0 
3.08 
(3.0-3.5) 
2.4 
(0.5-4. 5) 
6 
1 (5-6) 
6 
(6-7) 
14 
(12-18) 
7 
14.5 
3.01 
(3.0-3. 5) 
2.6 
(1. 0-4.0) 
6 
(5-6) 
6 
(6-7) 
14 
(12-16) 
30 
14.0 
3.0 
(3.0-3.2) 
2.37 
(1. 0-4.0) 
6 
(6-7) 
6 
(6-8) 
14 
(12-18) 
33 
13.5 
2.9 
(2.8-3. 5) 
1.9 
(1. 0-4.0) 
6 
(6-7) 
6 
(6-8) 
14 
(12-18) 
42 
13.0 
2.8 
(2. 5-3. 5) 
2.0 
(1. 0-4.0) 
6 
! (6-7) 
6 
(6-8) 
14 
(12-18) 
29 
12.5 
2.7 
(2. 5-3.0) 
1.3 
(0.8-3.0) 
6 
[ (6-7) 
6 
(6-7) 
14 
(12-18) 
40 
12.0 
2.78 
( 2. 2-3.0) 
1.7 
(0. 5-2.4) 
6 
(6-7) 
6 
(5-8) 
12 
(12-18) 
26 
11.5 
2.6 
(2. 5-2.9) 
0.9 
(0. 2-2.0) 
6 
(6-7) 
6 
(5-6) 
12 
(12-14) 
29 
11.0 
2.6 
(2. 2-2.8) 
0.7 
(0. 0-2.0) 
6 
(6-7) 
6 
(4-7) 
12 
(10-16) 
23 
10.5 
2.3 
(2. 2-2. 6) 
0.3 
( 0 . 0 - 1 . 0) 
6 
(6-7) 
6 
(4-6) 
12 
(10-14) 
20 
10.0 
2.29 
(2. 0-2. 5 ) 
0.14 
(0.0-1. 2) 
6 
(6-7) 
4 
(4-6) 
10 
(10-12) 
14 
9.5 
2.1 
(2. 0-2. 5 ) 
0.16 
(0.0-0. 5) 
6 
(6-7) 
4 
(3-6) 
10 
(10-13) 
18 
9.0 
2.1 
(2. 0-2.4) 
6 
(6-7) 
4 
(3-6) 
10 
( 8-12) 
10 
8.5 
2.08 
(2.0-2. 2) 
6 
(6-7) 
4 
(3-5) 
10 
( 8-12) 
11 
8.0 
2.0 
(1. 9-2.2) 
6 
(6-7) 
4 
(3-4) 
10 
(10-14) 
7 
7.5 
1.77 
( 1.7-2. 0) 
6 
(6-7) 
4 
(3-5) 
10 
( 8-10) 
6 
7.0 
1.75 
(1. 6-2.0) 
6 
(6-7) 
3 
(3-4) 
10 
( 8-10) 
5 
6.5 
1.72 
(1.6-1. 8) 
6 
(6- ) 
3 
(3-4) 
8 
( 8-10) 
3 
6.0 
1.6 
(1.5-1. 7) 
1 6 
(6-7) 
3 
(3-4) 
8 
( 2-10) 
1 
5.0 
1.8 
1 7 
3 
6 
67 
