82 
BULLETIN OF THE UNITED STATES FISH COMMISSION. 
as the adult form was determined did not stare ns in the face. We have, therefore, 
retained the name LeptocepliaVus for the larva?. 
The specimens forming the basis for this paper belong to the U. S. National 
Museum. We wish to express our thanks to the authorities for the privilege of 
examining them. Most of them were collected by the Fish Commission steamer 
Albatross at the following stations: 
Date. 
Station 
No. 
Lat. N. 
Long. W. 
Approximate location. 
1883. 
Nov. 5 
2103 
O I II 
38 47 20 
O ! U 
72 37 00 
100 miles SE. Atlantic City, N. J. 
1885. 
Aug. 29 
2566 
37 23 00 
68 08 00 
250 miles SE. Nantucket. 
Sept. 3 
2575 
41 07 00 
65 26 30 
160 miles S. Cape Sable, Nova Scotia. 
Sept. 20 
2588 
39 02 00 
72 36 00 
95 miles E. by S. Long Branch, N. J. 
Oct. 17 
2596 
35 08 30 
75 10 00 
20 miles SE. Cape Hatteras. 
Oct. 18 
2597 
34 57 00 
75 43 30 
20 miles S. Cape Hatteras. 
Oct. 18 
2600 
34 39 30 
75 35 30 
40 miles S. Cape Hatteras. 
Oct. 19 
2611 
34 15 00 
76 11 30 
55 miles SSE. Cape Lookout. 
Other localities will be given with different specimens. 
Grassi has demonstrated that the Leptocephali possess as many segments as the 
adult and we have found that the number of segments in the different specimens of 
a given Leptocephalus varies but little. The following table of the LeptocepKali, 
arranged according to the number of segments, may therefore assist in referring 
these species to their other larval phases and adult forms. It ivill also serve as a 
Ivey to the species described and permit other species that may be discovered to be 
r eadi ly i nte updated : 
Protovertebrae. 
Species. 
Length. 
Abdom- 
inal. 
Caudal. 
Total. 
mm. 
Leptocephalus grassii 
1 47 
i 49 
65 
68 
40 
40 
105 
108 
Leptocephalus diptychus r 
/ 38 
l 51 
76 
73 
38 
43 
114 
116 
Leptocephalus rex 
f 87 
\ 100 
59 
60 
119 
123 
Leptocephalus amphioxus 
65 
102 
20 
122 
1 42 
71 
57 
128 
Leptocephalus caudomaculatus 
54 
1 57 
70 
71 
72 
58 
128 
127 
1 59 
58 
130 
Leptocephalus latus 
70 
98 
35 
133 
Leptocephalus gillii 
50 
96 
41 
137 
Leptocephalus strommani 
61 
70 
71 
141 
Leptocephalus morrisii 
I 74 
1 86* 
54 
69 
88 
73 
142 
142 
1 75 
65 
79 
144 
Leptocephalus mucronatu - 
{ 80 
66 
80 
146 
1 82 
67 
80 
147 
Leptocephalus discus 
1 69 
1 71 
72 
75 
83 
84 
155 
159 
1 75 
68 
91 
159 
Leptocephalus humilis 
76 
| 78 
69 
71 
93 
90 
162 
161 
1 85 
68 
89 
187 
Leptocephalus gilberti 
73 
100 
80 
180 
*The larger specimen is tire younger. 
