812 
BULLETIN OF THE UNITED STATES FISH COMMISSION. 
is a band of lighter gray extending down to 1J inches above the eye. From this band down to the 
eye and forward to the stop the color is much lighter gray, which light color extends forward on to 
the base of the beak. 
On the left side the only prominent light patch is at the base of the convexity of the head, about 
midway between the eye and stop. Under the chin the whitish color extends forward to 5§ inches 
of tip of mandible. As in the other specimen, a line extends from the stop to the right eye, broadening 
out posteriorly and inclosing it. 
On the right side all the light color on the upper jaw from the eye forward, and all parts of the 
lower jaw backward to the base of the pectoral, are spotted with dark gray. The dark color of the 
anterior end of the mandible is made up of very small blackish spots massed together. These spots 
show also on the upper jaw, the upper lip being irregularly brownish-white and black-spotted. 
Pectorals darker than surrounding areas except at base; darker above than below and spotted on 
both sides, but the spots most distinct on the under side. Dorsal blackish with very obscure small 
darker spots, especially on the right side, having an antero-posterior direction. Flukes very dark gray 
above, lighter below, very obscurely spotted with darker color. Margins apparently blackish. 
The dimensions of the heads and fins are as follows: 
Measurement. 
No. 
112832. 
No. 
112833. 
Measurement. 
No. 
112832. 
No. 
112833. 
Tip of snout to stop (straight) 
Tip of snout to anterior point of blow- 
hole (straight) 
Tip of snout to center of eye (straight) . 
Tip of snout to corner of mouth 
(straight) 
Breadth of snout at stop (straight) 
Breadth of snout midway between stop 
and tip (straight) 
m m 
314 
330 
283 
59 
43 
54 
6 
22 
13 
mm. 
121 
337 
337 
289 
56 
43 
60 
6 
19 
14 
Transverse diameter of blowhole 
Pectoral, tip to head of humerus (straight) . 
Pectoral, tip to anterior insertion 
Pectoral, tip to posterior insertion 
Pectoral, greatest breadth 
Dorsal, height from center of base to tip . 
Dorsal , height from base of posterior mar- 
gin to tip T 
Flukes, from tip to tip 
rom .4 
1>l \ 22 
286 
279 
216 
86 
203 
168 
464 
133 
25 
42-43 
39—40 
Vertical depth of snout (both jaws, 
with mouth closed) at stop (straight) . 
Extent of lower jaw beyond the upper. 
Length of eye 
Antero-posterior diameter of blowhole. 
Flukes, breadth at base 
Flukes, depth of notch 
Number of teeth 
f 44-43 
t 42-40 
The dimensions, in millimeters, of the two Hawaiian skulls, together with those of four other 
skulls of Prodelphinus from the Indian Ocean, collected by Dr. W. L. Abbott, 0 are as follows: 
Measurement. 
U.S.N.M. 112832, 
Hawaii. 
t U.S.N.M. 112833, 
Hawaii. 
U.S.N.M. 36050 9, 
Amirantes Islands. 
U.S.N.M. 36049 cf, 
Amirantes Islands. 
U.S.N.M. 36051 9, 
Providence Island. 
U.S.N.M. 36031 9, 
Alphonse Island. 
U.S.N.M. 36048 cf, 
Johanna Island. 
mm. 
mm. 
mm. 
mm. 
mm. 
mm 
mm 
Total length 
422 
443 
415 
407 
403 
397 
379 
Length of beak 
264 
269 
253 
251 
244 
241 
222 
Breadth of beak at base of maxillary notches 
97 
92 
95 
95 
91 
96 
90 
Breadth of beak at its middle 
48 
46 
42 
' 43 
41 
43 
40 
Breadth of intermaxillae at middle of beak 
22 
22 
24 
25 
23 
26 
23 
Greatest breadth between outer margins of intermaxillae 
proximally 
70 
70 
66 
67 
65 
70 
64 
Length of superior tooth line 
225 
232 
220 
212 
215 
209 
191 
Last tooth to base of maxillary notch 
45 
45 
44 
45 
38 
42 
37 
Extremity of beak to anterior margin of superior nares — 
303 
321 
295 
295 
288 
279 
256 
Breadth between orbits 
159 
164 
158 
156 
156 
156 
146 
Breadth between hind margins of temporal fossae 
125 
130 
122 
127 
122 
123 
117 
Length of temporal fossae 
59 
62 
60 
65 
64 
65 
63 
Depth of temporal fossae 
49 
650 
47 
56 
53 
56 
54 
Length of mandible 
364 
375 
350 
347 
342 
327 
316 
Length of symphysis of mandible 
74 
77 
80 
73 
74 
67 
65 
Length of tooth row of mandible 
211 
225 
209 
205 
208 
195 
186 
Depth between angle and coronoid process 
59 
57 
57 
63 
59 
62 
53 
a See Proc. U.S.Nat.Mus., 17, 1894, p. 33; paper No. 982. 
b If measured on the continuation of the raised posterior border, = 51 this is the right side. On the left, = 42 mm 
or 47 "™ if measured on the continuation of the posterior raised border. 
