% ICHTHYOLOGICAL COLLECTIONS OF THE ALBATROSS. 425 
immediately behind the eye, the second and third approximated at posterior end of 
ridge. These bear no cirri. G. tricuspis has no tubercles on occiput. 
In males of G. pistilliger the postaxial region is furnished with a number of very 
slender filaments, each of which is expanded at tip into a compressed frond-like 
lamina, having the free edge more or less laciniate or fringed. These expanded tips 
‘are bright white and very conspicuous. No trace of them is present in females, but 
they develop in males ata very early age. These agree with the structures described 
by Pallas, on which he based the name pistilliger. They seem to be absent in G. 
‘tricuspis. 
The upper preopercular spine is sharply bifurcate in even our smallest specimens 
(50 mm.), but in these no trace of a second medial upwardly directed spine is 
‘present. The latter is evident in specimens 70 mm. and more in length, and a small 
concealed prominence representing a third spine is exceptionally present. 
The following table gives in millimeters the total length, the depth of body, and 
‘length of head in eight specimens: 
Total Length 
length. | of feuds Depth 
Mm Mm. Mm 
156 44 27 
145 394 254 
142 384 242 
135 38 244 
135 40 25 
134 37 24 
125 344 21 
93 254 16 
Very young specimens show no groups of granulations on head or nape, these being 
usually wanting in specimens less than 100 mm. long. In older specimens they are 
variously developed, the degree of armature dependent neither on age norsex. They 
are never armed on interorbital space, being unlike G. galeatus in this respect, the 
granulations being confined to the occipital and nuchal regions, with an additional 
elongate patch on the upper part of the opercle. In highly developed males the 
dorsal and ventral rays are accompanied with series of tubercles. 
The color is brown above, with very narrow vermiculating lines of lighter; a 
black blotch on cheeks, more conspicuous in males, and four inconspicuous crossbars 
on back. The darker dorsal area is bounded below lateral line by an irregular 
series of dark streaks or blotches. In males the lower jaw and preopercle are 
eross-banded with black and light yellow; the abdomen, the lower half of sides in 
front of anus, and the prepectoral region, have large roundish white spots, separated 
by vermiculating areas rendered dusky by aggregations of coarse black dots. 
Ventrals dusky and silvery, the latter frequently forming crossbands. Spinous 
dorsal dusky or black, with irregular series of white spots not confined to basal 
parts of fin. In both sexes the pectorals, second dorsal, and caudal are translucent 
or yellowish, crossed by narrow black bars. 
The females are more numerons than the males in our collection, but the disparity 
in numbers is not so great as has been found by other writers. In 45 specimens 
-examined as to this, 17 are males, 28 females. ‘l'aken abundantly in Bristol Bay at 
stations 3230, 3231, 3232, 3233, 3237, 3238, 3239, 3240, 3241, 3242, 3243, 3244, 3245, 3246, 
3289, 3291, 3296, 3300; depths, 34+ to 26 fathoms. 
67. Gymnacanthus galeatus Bean. 
A single male specimen, 210 mm. long, from Chernoffski Harbor, Unalaska Island. 
The sexual peculiarities are less strongly marked than in much smaller males of 
G. pistilliger. 
The ventrals extend but little beyond the front of the anal fin, and are unmarked. 
The abdomen is also plain, without the round white spots characteristic of male 
7 . z 
