Jordan and Evermann. Fishes of North America. 2059 



spot on base of pectoral. Kamchatka. This account taken from 1 of the 

 type specimens presented * to the Leland Stanford Junior University 

 Museum by Dr. Collett. (Named for Charles Henry Gilbert.) 



* The following is Dr. Collett's description : First dorsal 8; second dorsal 8 or 9; anal 10 

 or 1 1 ; pectoral 15 to 17 ; lateral line :>8. The body is very elongated and compressed, rather 

 high in front, and tapering to the tail. Its height (from vciitrals to first dorsal scale) 

 equals the length of the snout, and is contained in the total length about 8 times. The 

 tail is compressed, long and slender; its height everywhere greater than its breadth. The 

 head: Its length is contained in full-grown specimens 4 times, in younger ones about 3| 

 times in the total length (caudal included). Thus in 4 specimens of different sizes the 

 proportions are the following: Total length lH:i mm., head length 3-0(5 times; total length 

 254 mm., head length ',\ l'.\ times; total length 277 mm., head length 4-01 times; total 

 length 290 mm., head length 4 O'J times. Snout very long, :{ times longer (or more) than 

 the interorbital space (between the bases of the supraocular spines). Posterior part of 

 the head comparatively smooth, the interorbital space rather concave; no quadrangular 



Sit on the occiput, in front of the dorsal scales. K\e comparatively large; the horizontal 

 iameter a little larger than the vertical. It is contained a little more than 2 times in the 

 length of the snout, and rather more than 4 times in the length of the head. Cirri on 

 lower side of snout (in front of the prema\illar\ ) and at the 'angle of the jaws. 1 Their 

 length equals t hat of t he eve. Month entirely inferior; distance fiom premaxillaries to 

 tip'ol rostril spines about equal to the length of the eye. Teeth in the jaws, vomerine or 

 palatine teeth none. Armature of the head much like that of A. acipenserinus. The 

 rostral spines 4, 2 projecting horizontally forward. 2 (behind the lirst) curved backward. 

 A third pair on the snout (much nearer the eye than the rostral spines). Orbital ridge 

 with a single spine i supraocular. no preocular) ; the lower ridge finely serrated. Occipi- 

 tal ridges, operculum. and preoperculum as in A.acipenserinus, but the spines more 

 pointed and longer. Suhorhital with a double ridge at its lower margin, the upper ridge 

 with 2 distinct spines behind, and a third (sometimes indistinct) at equal distance from 

 the eye and the tip of the snout. Head with about 18 distinct spine.-* altogether. Arma- 

 ture of body : Plates mi the back and sides of the same number at> in A . acipenserinus, but 

 the spinel are longer and curved more backward, and strong everywhere from head to 

 caudal. P.et ween the 2 dorsal keels and between the 2 lateral keels there are no traces of 

 another keel (as in .1 . rulm/*). P.reast with about 10 polygonal plates, 4 of which form a 

 series on each side and 2 a median series; bases ot pectorals and ventrals also surrounded 

 with plates. All the plates have a short spine in their center. Dorsal plates numbering 



Plates. 



From occiput to first dorsal (pair) . . 4 



First dorsal extending over do 8 



Between the dorsals. do 3 



Second dorsal extending over do 9+1 



From second dorsal to caudal (single) . . 15 



The dorsal keel (coalescing with the keel on the other side at the fifteenth plate in front 

 of the caudal fin) is consequently composed of 38 or 39 plates; the lower lateral keel 

 extending from lower base of the caudal to base of the tenth pectoral ray, contains 35 

 plates. Abdominal plates numbering 



Plates. 



From ventrals to anal (pair) . . 11 



The anal extending over do 10 



From anal to caudal (single) . . 17 



The abdominal keel (coalescing at the seventeenth plate in front of the caudal) is formed 

 by a series of 38 plates. Lateral line distinct; 38 pores. Fins: In the 10 specimens at 

 present preserved in the museum at Christiania, the fin rays are the following : 



1 D. 8 2 D. 8 A. 10 P. 17-17 



8 9 10 ?-16 



8 10 16-16 



8 8 10 15-16 



8 8 10 17-17 



8 8 10 17-17 



8 8 10 16-17 



8(+l) 8 11 16-17 



8 8 10 15-16 



8 9 10 17-17 



First dorsal begins behind the fourth dorsal plate and has 8 rays (1 specimen has an 

 additional slender ray in the space between the 2 dorsals). Its height equals its distance 

 from the head. It extends over 8 scales; the first 2 rays in the space between the fourth 

 and fifth plate. The dorsal fins are separated by 3, sometimes by 4 plates. Second dorsal 

 has 8, sometimes 9, rays, and extends over 8 plates ; behind the last rays is 1 pair of plates 



1 All the specimens are in a bad state of preservation and most of the barbels are lost. 



