574 
BULLETIN OF THE BUREAU OF FISHERIES 
at Beaufort than the other two, remain unknown. A fourth species, Blennius stearnsi, 
was recorded from Beaufort by Radcliffe (1914) without comment. This species was 
not seen by us. 
The adults are not especially difficult to identify, yet care is required as the 
species superficially are not strikingly different. This is true especially of young 
adults. Accordingly the following key, embodying characters thought to be readily 
usable and dependable, is offered. 
KEY TO THE GENERA AND SPECIES 
a. Head short, deep; forehead very steep (nearly vertical) ; snout scarcely projecting. Mouth small; 
maxillary scarcely reaching middle of eye. Canine teeth wanting. P. 14, rarely 13 or 15; 
D. XII, 14 or 15; A. II, 16 Hypsoblennius hentz 
aa. Head somewhat longer, not quite as deep; forehead not very steep, strongly convex; snout 
projecting moderately. Mouth small; maxillary reaching only slightly past anterior margin 
of eye. Each jaw with a strong canine tooth posteriorly, near angle of mouth. P. 14; D. XI to 
XIII, 14 or 15; A. II, 16 or 17 Hypleurochilus geminatus. 
aaa. Head notably longer and not as deep; forehead not steep, rather gently convex; snout strongly 
projecting, very pointed. Mouth large; maxillary reaching to or past posterior margin of eye. 
Canine teeth wanting. P. 12, rarely 11; D. XI or XII, 18; A. II, 17 or 18 
Chasmodes bosquianus. 
THE CHARACTERS OF THE EGGS AND NEWLY HATCHED YOUNG 
The eggs of the three species of blennies discussed in this report are not difficult 
to recognize. That is not true for the young, however, which are very similar in 
appearance. The distinguishing characters of the eggs and newly hatched larvae are 
shown in the parallel comparison which follows. The distinguishing characters of young 
Hypsoblennius hentz and Hypleurochilus geminatus taken in the tow are described 
in the text. Since young Chasmodes bosquianus were not taken in collections made 
in nature, our present knowledge of its development ends with the newly hatched larvae. 
DISTINGUISHING CHARACTERS 
EGGS 
Hypsoblennius hentz 
Moderately small, about 0.77 
mm in diameter. Eggs with 
violet or old rose colored bod- 
ies (disappearing in advanced 
stage of development) and 
yellow oil globules in yolk. 
Larvae moderately small, average 
length about 2.7 mm. Myo- 
meres behind vent about 23. 
Black markings on abdomen 
(yolksac) generally scattered, 
usually not especially concen- 
trated at upper edge of ab- 
dominal mass. 
Lower two-thirds or so of inner 
surface of pectoral fin mem- 
branes with black ehromato- 
phores. 
An elongate branching black 
spot under auditory vesicle. 
Hypleurochilus geminatus 
Small, about 0.69 mm in diam- 
eter. Eggs with purple spots 
(disappearing in advanced 
stage of development) and 
bright golden yellow to orange 
oil globules in yolk. 
NEWLY HATCHED YOUNG 
Larvae small, average length 
about 2.4 mm. Myomeres 
behind vent about 24. 
Black markings mostly concen- 
trated at upper margin of ab- 
dominal mass. 
Pectoral fin membranes at most 
with only a few black chroma- 
tophores at base. 
An elongate branching black 
spot under auditory vesicle. 
Chasmodes bosquianus 
Large, about 1.04 mm in diam- 
eter. Eggs with pale yellow 
oil globules, never with violet 
or purple bodies in yolk. 
Larvae large, average length 
about 3.66 mm. Myomeres 
behind vent about 28. 
Black markings mostly concen- 
trated at upper margin of ab- 
dominal mass. 
Lower two-thirds or so of pec- 
toral fin membranes with 
black chromatophores. 
No black under auditory vesicle. 
