Two New Chaetognaths — Alvarino 
73 
TABLE 3 
Measurements of Sagitta euneritica 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 
15.5 
3.2 
(3.0-3.4) 
2.0 
(2. 0-2.0) 
7- 
-9 
6-8 
14-16 
7 
15.0 
3.2 
( 3-0— 3.4 ) 
1.6 
(1. 0-2.2) 
8 
(8-9) 
6 
(5-7) 
14 
(10-16) 
7 
14.5 
3.1 
(3.0-3.2) 
1.3 
( 1.0-2. 5) 
8 
(7-9) 
6 
(5-7) 
12 
(12-16) 
30 
14.0 
2.9 
(2. 5-3. 2) 
1.59 
(1. 0-2.3) 
8 
(7-8) 
6 
(6-7) 
14 
(10-16) 
34 
13.5 
2.8 
(2. 5-3.0) 
1.52 
(1. 0-2.0) 
8 
(7-9) 
6 
(4-7) 
12 
(10-16) 
54 
13-0 
2.58 
(2. 5-3.2) 
1.5 
( 0.4-3. 0) 
8 
(7-9) 
6 
(5-7) 
12 
(10-16) 
16 
12.5 
2.6 
(2. 5-3.0) 
1.2 
(0.6-2. 6) 
8 
(7-8) 
6 
(5-6) 
12 
( 10—12) 
44 
12.0 
2.7 
(2.3-3.0) 
1.2 
(0.0-2. 5) 
8 
(7-9) 
6 
(4-7) 
12 
(10-16) 
16 
11.5 
2.6 
(2. 3-2. 6) 
0.8 
(0. 3-2.0) 
8 
(7-8) 
6 
(4-7) 
12 
(10-12) 
15 
11.0 
2.2 
(2.0-2.6) 
0.66 
(0.3-1. 3) 
8 
(7-8) 
6 
(4-6) 
10 
(10-14) 
10 
10.5 
2.05 
(2.0-2. 3) 
0.56 
(0. 3-1.0) 
8 
(6-8) 
6 
(4-6) 
10 
(10-12) 
9 
10.0 
2.0 
(2.0-2.2) 
0.54 
( 0.3-1. 1) 
8 
(7-8) 
6 
(4-6) 
10 
(10-12) 
7 
9.5 
1.9 
(1. 8-2.0) 
0.41 
(0.2-0. 7) 
8 
(7-8) 
6 
(3-6) 
10 
( 8-12) 
6 
9.0 
1.8 
(1. 6-2.0) 
0.25 
(0. 1-0.4) 
8 
(7-8) 
4 
(2-6) 
8 
( 6-12) 
7 
8.5 
1.8 
( 1.5-2. 0) 
0.2 
(0.1-0. 3 ) 
8 
(7-8) 
4 
(3-6) 
8 
( 8-10) 
6 
8.0 
1.7 
( 1.5-2. 0) 
0.18 
(0.1-0. 3) 
8 
(7-8) 
3 
(3-6) 
8 
( 8-10) 
6 
7.5 
1.7 
( 1. 5-2.0) 
0.1 
(0.1-0. 2) 
8 
(7-8) 
3 
(3-5) 
8 
( 8-10) 
4 
7.0 
1.6 
(1.4-1. 9) 
0.1 
(0.1-0. 2) 
8 
(7-8) 
3 
(3-5) 
8 
( 8-10) 
5 
6.5 
1.4 
( 1.3-1. 5) 
0.1 
(0. 1-0.2) 
8 
(7-8) 
3 
(2-4) 
8 
( 6- 8) 
5 
6.0 
1.4 
( 1.3-1. 5) 
0.1 
8 
(7-8) 
3 
(2-4) 
7 
( 7- 8) 
2 
5.0 
1.2 
(1.2-1. 3) 
7 
(2-3) 
( 6- 8) 
1 
4.5 
1.2 
8 
2 
6 
1 
4.0 
0.9 
7 
2 
6 
TABLE 4 
Principal Differential Characteristics of Forms Closely Related to Sagitta euneritica n. sp. 
S. setosa Miiller 
S. friderici Ritter-Zahony 
S. euneritica n. sp. 
Total length, 
mm., mature 
10-14 
10-15 
10.5-15.5 
% tail 
16-21.7 
22.6-27 
19-22 
Anterior fins 
Begin somewhat behind ven- 
tral ganglion. 
Begin at posterior end of ven- 
tral ganglion. 
Begin a small distance behind 
posterior end of ventral gan- 
glion. 
Posterior 
fins 
More on trunk than tail, and 
end at seminal vesicles. 
More on tail than trunk, and 
extend to seminal vesicles. 
More on trunk than tail, and 
extend to seminal vesicles. 
Collarette 
Very small. 
Noticeable. 
Well developed. 
Seminal 
vesicles 
Far from tail fin and close to 
posterior end of posterior fins. 
Touching both tail fin and pos- 
terior fins. 
Touching both tail fin and 
posterior fins. 
Ovaries 
Short, extend to anterior end 
of posterior fins. Ovulae large 
and in small numbers. 
Extend forward of anterior end 
of posterior fins. Ovulae regu- 
lar in size and numerous. 
Short, extend to anterior end 
of posterior fins. Ovulae small, 
filling ovaries. 
