618 
BULLETIN OF THE UNITED STATES FISH COMMISSION. 
Hynnodus atherinoides, new species. Plate 79. 
Type, 117 mm. long, from station 3867, Pailolo Channel, depth 284 to 290 fathoms- type No. 
51601, U. S. Nat. Mus. - 
Head 31 hundredths of the total length to base of caudal; greatest depth 15; least depth of 
caudal peduncle 7.5; length of snout 7; diameter of orbit 14; length of maxillary 11.5; interorbital 
width 6; greatest width of head 16; distance from tip of snout to ventrals 33; to front of dorsal 36- 
distance between dorsals 12. D. vn-x, 10; A. ir, 9; V. i, 5; P. 22 or 23. Scales in the lateral line 54- 
gill-rakers 6 + 16; branchiostegals 7. 
Body extremely elongate, occiput depressed, broader than deep; snout and interorbital space 
flattish above, orbital rims not noticeably raised; mouth terminal, oblique; lower jaw included; 
maxillary in part slipping under the very narrow preorbital, not reaching vertical from front of pupil; 
teeth very small, slightly curved, in single series in jaws and on palatine bones, in a patch on head of 
vomer; tongue smooth; posterior nostril a transverse slit in front of upper part of orbit; the anterior a 
wide pore with raised margins, directed forward, slightly nearer eye than tip of snout; preopercle 
forming a narrow projecting rounded lobe at angle, but not striate; interopercle expanded below to 
form a very thin projecting lamina; opercle bearing a single strong spine, all other bones of head 
unarmed; 4 gills, with a slit behind fourth arch; pseudobran chise very large; gill-rakers long and 
slender, 6 + 16 in number, the longest one-third length of maxillary. 
Dorsal spines slender, the first very short, about one-eighth length of second; a definite well- 
developed spine at beginning of second dorsal; first anal spine less than one-third length of second; 
all the spines strongly compressed. As the margins of all the fins are mutilated, their shape can not be 
given. 
The scales of lateral line persist, but all others have fallen. The extent to which the head was 
covered can not be ascertained. 
Color dark gray, darker along margins of scales; snout blackish; dorsals and anal dusky; mouth 
light, but the gullet, branchial chamber, and peritoneum jet-black; opercles appear blackish externally. 
Two specimens were taken at station 3867. 
Synagrops argyrea (Gilbert & Cramer). 
A rare species, but 8 specimens secured. The original account of the species may be corrected as to 
the following details: Depth of body 3.5 in total length without caudal; least depth of caudal peduncle 
2.7 m depth of body; eye averages a little smaller, being contained 3.3 to 3.4 in head; a distinct slender 
supplemental maxillary bone; each ramus of lower jaw usually containing only 4 (rarely 5) canines, 
instead of 7 as in type; upper end of base of pectoral on a level with lower margin of orbit. 
Taken at the following stations: Nos. 3867, Pailolo Channel, 284 to 290 fathoms; 3920, off the south 
coast of Oahu, 280 to 265 fathoms; 4084, off the north coast of Maui, 253 to 267 fathoms; 4102 Pailolo 
Channel, 122 to 132 fathoms. 
Melanostoma argyreum Gilbert & Cramer, Proc. U. S. Nat. Mus., XIX, 1897, 416, pi. 39, fig. 3. 
Family SERRANID£. 
Grammatonotus, new genus. 
Closely allied to Callanthias, differing in having but one opercular spine, in the presence of large 
pores on the head, and in the tubular anterior nostril; the canines are greatly reduced in size, and the 
snout is not scaled in front of the eye; lateral line single, running along base of dorsal fin, ending under 
last ray ; scales large, minutely ctenoid, rough; dorsal fin continuous, not notched; soft dorsal and anal 
with middle rays produced into pointed lobes; ventrals very close together, with one spine and 5 ravs, 
the outer ray longest; preopercle entire; opercle with. a single pungent spine; gill membranes narrowly 
united, with 6 rays. 
Grammatonotus, Gilbert, new genus of Serranulx ,( laysanus ). 
