80 
BULLETIN OF THE BUREAU OF FISHERIES 
Proportional measurements — In addition to the characters discussed above there 
are also some significant proportional measurements. A number of measurements 
expressed as percentages of the standard length are given in Table 4. Of course, 
the measurements are too few to warrant drawing any general conclusions. They 
were intended merely as a test to show whether such characters will separate the two 
forms more convincingly. Of the various measurements taken it may be seen that 
those that show the greatest divergence are the length of the maxillary, the length 
of the snout, and the depth of the caudal peduncle. However, a close examination 
of the figures seems to show that if a long series of measurements be taken, most 
likely the results will not be more convincing than are the characters already men- 
tioned. They will probably only duplicate the previous results and emphasize the 
fundamental differences between the two forms while at the same time showing their 
close relationship. It is, therefore, not deemed necessary for our purpose to under- 
take the extra labor of a long series of measurements. The magnitude of the test is 
also increased by the fact that the proportional measurements vary greatly with the 
size of the fish and hence are not comparable when taken from fish of widely 
different sizes. 
Table 4 shows that the length of the snout and of the maxillary and the depth of 
the caudal peduncle vary in the two species in different directions — in regalis the 
snout and maxillary are shorter while the peduncle is deeper than in arenarius. Hence, 
the divergence in the two species may be shown more clearly when these measurements 
are compared. This is done in Table 5, the figures representing the number of times 
the depth of the caudal peduncle goes into the length of the snout and the maxillary, 
respectively. 
Table 4 .—Some proportional measurements of Cynoscion regalis and C. arenarius 
[The numbers represent percentages of the standard length; that is, the distance from the tip of the snout to the base of the caudal] 
Standard length 
Snout 
Maxillary 
Least 
depth of 
caudal 
peduncle 
End of in- 
sertion of 
dorsal to 
base of 
caudal on 
mid line 
Vent to 
end of 
insertion 
of anal 
Head 
Depth 
Eye 
Cynoscion regalis: 
275 
8. 25 
13.31 
8. 84 
13. 71 
14. 22 
30. 76 
23. 64 
5. 13 
247 
8. 14 
13. 52 
8. 71 
12. 35 
14. 94 
30. 04 
24. 66 
5.26 
236 
8. 09 
14. 07 
9. 36 
13. 77 
15. 21 
30.59 
23.31 
5. S9 
208 - 
9. 04 
14. 86 
9. 47 
13. 56 
14. 42 
32.46 
27. 98 
6. 59 
200 - 
7.75 
13. 85 
9. 30 
13. 35 
14. 65 
30.70 
24.60 
6. 35 
197 
8. 32 
13. 96 
9.34 
12. 28 
16. 55 
31.22 
23.60 
6.40 
178 . 
8. 99 
14. 66 
9. 38 
11.69 
14. 61 
32. 64 
24.04 
6.69 
167 - - 
8. 62 
14. 19 
9. 76 
12.40 
16. 53 
32. 22 
25. 39 
6. 77 
162 . 
7.90 
13.70 
9.88 
13. 83 
16.54 
30. 93 
25. 08 
7. 00 
102 . 
8.92 
15.29 
9. 22 
12. 66 
18. 18 
34. 61 
27.16 
8. 53 
C. arenarius: 
268 
9.70 
14. 55 
8. 43 
12. 31 
15. 41 
31. 23 
25.00 
5.11 
242 
8.88 
14. 50 
8.68 
12. 56 
14. 79 
31.49 
25. 08 
5. 37 
228 - 
9.00 
14. 43 
8.46 
14.17 
14. 03 
31.27 
24. 30 
5. 61 
213 
9.15 
15.12 
8. 31 
13.80 
12. 63 
32. 30 
25. 82 
5.87 
203 
8. 97 
15. 00 
8. 33 
13. 35 
14.53 
32. 02 
23. 30 
5. 86 
184 
9. 18 
14. 95 
8. 59 
13. 48 
13.91 
32.60 
23. 70 
6.30 
178 
9.44 
14.78 
8. 31 
13.60 
15. 17 
32.58 
24. 49 
6.40 
173 
9.31 
14.80 
9. 13 
12.83 
16. 18 
32.89 
26. 82 
6. 53 
169 -- 
9.35 
14.50 
9.23 
13. 07 
14. 79 
31. 36 
27. 22 
6. 45 
no 
8. 91 
15. 00 
8. 36 
12. 45 
15.64 
33. 82 
24. 18 
7. 91 
