APODAL FISHES OF AMERICA AND EUROPE. 
653 
ANALYSIS OF GENERA OF NEMICHTHYIDAC. 
a. Gill-openings partly confluent, rather large ; vomerine teeth conspicuously enlarged. 
b. Vomerine teeth lancet-shaped, very close set ; jaws moderate, the snout not 
longer than rest of head ; vent at a distance behind head about equal to 
postorbital part of head ; eye above angle of mouth Serri vomer, 34. 
bb>. Vomerine teeth conical ; jaws very long, attenuate ; color silvery. 
) Spinivomer, 35. 
a'd. Gill-openings distinctly separate; vomerine teeth moderate; jaws excessively 
attenuate, the upper longer and recurved; tail probably always normally 
with a filiform tip ; (truncate in injured specimens; short and band-like 
in translucent larva}). 
c. Vent remote from the head, at a distance behind pectoral more than 3 times 
length of that fin ; color black. 
d. Gill-slits very small, inferior, well separated ; dorsal commencing above 
vent; (tail truncate) ; jaws moderate Cyema,36. 
dd. Gill-slits lateral, vertical, well separated; dorsal commencing above pec- 
torals ; tail filamentous; jaws long and slender ; a single series of pores 
along lateral line Avocettina, 37. 
cc. Vent at the throat, at a distance behind the head less than length of pectoral; 
anal fin beginning below middle of pectorals ; body very long and slen- 
der, most of the dorsal rays very slender, nearly free, appearing like 
slender spines; jaws very slender, not expanded ac tip. 
e. (Tail truncate, the result of mutilation?); a single row of pores along 
lateral line ; color black Labichthys, 38. 
ee. Tail always ending in a long filament ; two or three rows of pores along 
lateral line ; color dusky silvery, darker below Nemichthys, 39. 
Genus 34.— SERRIVOMER. 
Serrivomer Gill & Ryder, Proc. U. S. Nat. Mus., 260, 1883 ( beani ). 
Type : Serrivomer beani Gill & Ryder. 
Etymology : Latin, serra , saw ; vomer. 
This genus contains a single species, from the deep waters of the 
Atlantic. 
ANALYSIS of the species of serrivomer. 
a. [Stoutest of the family, with much shorter jaws than any other, and with a very 
formidable vomerine armature ; depth of head at vertical from mandibular articu- 
lation contained 37 times in the total length ; greatest height 29£ in total length. J 
(Gill $ Ryder) Beani, 103. 
103. SERRIVOMER BEANI. 
Serrivomer beani Gill & Ryder, Proc. U. S. Nat. Mus., 261, 1883 (Atlantic). 
Habitat : Atlantic Ocean (lat. 41° 40' 30", long. 65° 28' 30"). 
Etymology : Named for Tarleton H. Bean. 
This species is known from the brief description given by Dr. Gill. 
Genus 35.— SPINIVOMER. 
Spinivomer Gill & Ryder, Prop. U. S. Nat. Mus., 26JL, 1883 (goodei). 
Type: Spinivomer goodei Gill & Ryder. 
Etymology: Latin, spinas , spine; vomer. 
