﻿834 
  REPORT 
  OF 
  COMMISSIONER 
  OF 
  FISH 
  AND 
  FISHERIES. 
  [46] 
  

  

  Family 
  LIL— 
  CHAULIODONTID^. 
  (44) 
  

  

  148.— 
  CHAULIODUS 
  Blocli 
  & 
  Schneider. 
  (133) 
  

  

  536. 
  Chauliodus 
  sloani 
  Bloeh 
  & 
  Schneider. 
  B. 
  Ev. 
  (469) 
  

  

  149— 
  CYCLOTHONE 
  1 
  Goode 
  & 
  Bean. 
  

  

  537. 
  Cyclothone 
  lusca 
  Goode 
  & 
  Bean. 
  B. 
  

  

  150.— 
  SIGMOPS 
  2 
  Gill. 
  

  

  538. 
  Sigmops 
  stigmaticus 
  Gill. 
  B. 
  

  

  line 
  nearly 
  continuous, 
  in 
  a 
  sigmoid 
  curve; 
  teeth 
  of 
  the 
  jaws 
  in 
  several 
  series, 
  the 
  

   largest 
  teeth 
  in 
  the 
  inner 
  row 
  ; 
  a 
  single 
  spike-like 
  neural 
  spine 
  before 
  dorsal 
  ; 
  branchios- 
  

   tegals, 
  5. 
  Otherwise 
  essentially 
  as 
  in 
  Argyropelecus. 
  (^zspvov, 
  breast 
  ; 
  nrvc, 
  fold 
  or 
  

   plait.) 
  

  

  Sternoptyx 
  diaphana 
  Hermann. 
  

  

  Depth 
  equal 
  to 
  distance 
  between 
  tip 
  of 
  snout 
  and 
  base 
  of 
  the 
  very 
  short 
  tail. 
  In- 
  

   terorbital 
  space 
  slightly 
  concave 
  ; 
  posterior 
  limb 
  of 
  preopercle 
  bordering 
  hind 
  part 
  

   of 
  orbit, 
  and 
  descending 
  very 
  obliquely, 
  ending 
  in 
  two 
  points. 
  Pectoral 
  scarcely 
  

   reaching 
  ventrals, 
  which 
  are 
  very 
  small. 
  B. 
  5, 
  D. 
  9, 
  A. 
  13, 
  P. 
  10, 
  V. 
  3. 
  (Gunther.) 
  

   Atlantic 
  ; 
  lately 
  taken 
  in 
  the 
  Gulf 
  Stream, 
  about 
  lat. 
  33°. 
  

  

  (Hermann, 
  1. 
  c. 
  ; 
  Gunther, 
  V, 
  387 
  ; 
  Goode 
  & 
  Bean, 
  Bull. 
  Mus. 
  Comp. 
  Zool., 
  1882, 
  220.) 
  

  

  1 
  Cyclothone 
  Goode 
  & 
  Bean. 
  

  

  (Goode 
  & 
  Bean, 
  Bull. 
  Mus. 
  Comp. 
  Zool., 
  1882, 
  221 
  ; 
  type 
  Cyclothone 
  lusca 
  G. 
  & 
  B.) 
  

  

  Body 
  elongate, 
  somewhat 
  compressed 
  (apparently 
  covered 
  with 
  rather 
  large, 
  thin, 
  

   very 
  caducous 
  scales) 
  ; 
  lower 
  parts 
  with 
  a 
  series 
  of 
  luminous 
  spots. 
  Head 
  conical; 
  

   cleft 
  of 
  mouth 
  very 
  wide, 
  oblique 
  extending 
  behind 
  eye, 
  the 
  lower 
  jaw 
  strongly 
  pro- 
  

   jecting. 
  Maxillary 
  long 
  and 
  slender, 
  sickle-shaped, 
  closely 
  connected 
  with 
  the 
  short 
  

   premaxillary. 
  Upper 
  jaw 
  with 
  a 
  single 
  series 
  of 
  rather 
  large 
  close-set 
  sharp 
  teeth, 
  

   about 
  every 
  fourth 
  one 
  slightly 
  longer 
  than 
  the 
  rest, 
  and 
  directed 
  slightly 
  outward. 
  

   Lower 
  jaw 
  with 
  similar 
  teeth, 
  subequal, 
  directed 
  forward, 
  with 
  a 
  few 
  canines 
  in 
  front. 
  

   A 
  small 
  patch 
  of 
  minute 
  teeth 
  on 
  vomer 
  ; 
  palatines 
  smooth. 
  Eye 
  small, 
  inconspicuous. 
  

   Gill 
  openings 
  very 
  wide, 
  the 
  membranes 
  free 
  from 
  the 
  isthmus. 
  Gill 
  rakers 
  numerous, 
  

   long 
  and 
  slender. 
  Pseudobranchiae 
  none. 
  Branchiostegals 
  (apparently 
  7 
  to 
  9). 
  No 
  

   air-bladder. 
  Dorsal 
  and 
  anal 
  well 
  developed, 
  opposite 
  each 
  other. 
  No 
  adipose 
  fin. 
  

   Caudal 
  forked, 
  its 
  peduncle 
  long 
  and 
  slender. 
  Deep-sea 
  fishes 
  of 
  small 
  size, 
  closely 
  

   related 
  to 
  the 
  European 
  genus 
  Gonostoma. 
  (Kvk\o$, 
  round; 
  oBoovrj, 
  veil.) 
  

  

  Cyclothone 
  lusca 
  Goode 
  & 
  Bean. 
  

  

  Uniform 
  black, 
  the 
  mucous 
  pores 
  inconspicuous. 
  Maxillary 
  extending 
  backward 
  

   to 
  a 
  distance 
  from 
  tip 
  of 
  snout 
  equal 
  to 
  length 
  of 
  head 
  without 
  snout; 
  eye 
  as 
  long 
  as 
  

   snout, 
  7 
  in 
  head. 
  Distance 
  from 
  snout 
  to 
  dorsal 
  three 
  times 
  length 
  of 
  lower 
  jaw, 
  its 
  

   base 
  as 
  long 
  as 
  head. 
  Second 
  ray 
  longest, 
  £ 
  base 
  of 
  fin. 
  Insertion 
  of 
  anal 
  under 
  

   second 
  ray 
  of 
  dorsal, 
  its 
  longest 
  rays 
  a 
  little 
  higher 
  than 
  those 
  of 
  dorsal. 
  Pectoral. 
  

   7f 
  in 
  length 
  of 
  body. 
  Distance 
  from 
  snout 
  to 
  ventral 
  twice 
  head; 
  ventral 
  7 
  in 
  body. 
  

   Head, 
  4f 
  ; 
  depth, 
  7f. 
  D. 
  1, 
  11, 
  A. 
  1, 
  16, 
  P. 
  10, 
  V. 
  5. 
  Gulf 
  Stream, 
  in 
  deep 
  water 
  off 
  

   south 
  coast 
  of 
  New 
  England, 
  not 
  rare. 
  

  

  (Goode 
  & 
  Bean, 
  Bull. 
  Mus. 
  Comp. 
  Zool. 
  1882, 
  221.) 
  

  

  2 
  Sigmops 
  Gill. 
  

  

  (Gill, 
  Proc. 
  U. 
  S. 
  Nat. 
  Mus., 
  1883, 
  256; 
  type 
  Sigmops 
  stigmaticus 
  Gill.) 
  

   No 
  scales 
  or 
  pseudobrauchiaB 
  ; 
  body 
  elongate, 
  claviform 
  ; 
  dorsal 
  short 
  ; 
  anal 
  long, 
  

   the 
  insertions 
  of 
  the 
  two 
  fins 
  opposite 
  each 
  other; 
  teeth 
  moderately 
  elongate, 
  alter- 
  

  

  