656 REPORT OF COMMISSIONER OF FISH AND FISHERIES. 
This genus is based on two species from deep waters of the Atlantic. 
The scanty description does not show any important difference from 
Nemichtkys , if we suppose, as is probable, that the truncate tail is the 
result of mutilation. 
ANALYSIS OF THE SPECIES OF LABICHTHYS. 
a. [The ridges that hound the median rostral groove converging and forming a carina 
along the median line in vertical from the anterior border of the orbit ; greatest 
height 34£ in total length. Color black.] (Gill <$r Ryder.) [Dorsal beginning over 
base of pectoral; vent close behind the pectorals]. (Bean.) Carinatus, 108. 
aa. [The ridges that bound the rostral groove not confluent backwards in a carina- 
form extension, but ending in a vertical from the orbit ; greatest height of body 
36 in a total length. Color black.] (Gill $ Ryder.) Elongatus, 109. 
108. LABICHTHYS CARINATUS. 
Labichthys carinatus Gill & Ryder, Proc. U. S. Nat. Mus., 253, 255, 261, 1883 (At- 
lantic). 
Habitat : Atlantic Ocean, lat. 41° 13^ long. 65° 33' 30". 
Etymology : Latin, carinatus , keeled. 
This species is known only from the scanty description of Gill & 
Ryder. According to Bean it agrees with Nemichtliys in the position 
of its vent. 
109. LABICHTHYS ELONGATUS. 
Labichthys elongatus Gill & Ryder, Proc. U. S. Nat. Mus., 262, 1883 (Atlantic). 
Habitat : Atlantic Ocean, lat. 39° 22', long. 68° 34' 30". 
Etymology : Latin, elongatus , elongate. 
This species is known only from the original diagnosis. The position 
of the vent is not stated. 
Genus 39.— KEMICHTHYJS. 
Nemichtkys Richardson, Voyage Samarang, 16, 1848 (scolopaceus ) . 
Leptorhynchus Lowe, Ann. Mag. Nat. Hist., x, 54, 1852 (leuohteubergi) (preoccupied). 
Belonopsis Brandt, Mdm. Ac. St. Petersb., Savans Ftrangers, 174, 1854 (leuchten- 
bergi). 
Type : Nemichtkys scolopaceus Richardson. 
Etymology : Ny/ia, thread ; l/Obs, fish. 
This genus contains one or two species of long and very slender eels 
living in deep water, though perhaps nearer the surface than the mem- 
bers of related genera. 
ANALYSIS OF THE AMERICAN SPECIES OF NEMICHTHYS. 
a. (Head comparatively stout, its depth one-seventh its greatest length ; eye moder- 
ate, less than one-third the length of head without snout ; length of pectoral 
slightly less than height of anal. Pale above, belly and anal fin blackish, the 
color not abruptly changing; back -somewhat speckled.) Scolopaceus, 110. 
