﻿6 
  c. 
  BOVALLIUS, 
  lANTHE. 
  

  

  seventh 
  each 
  one 
  directed 
  backwards, 
  with 
  a 
  small 
  onxe 
  at 
  

   the 
  base 
  (Pl. 
  I, 
  fig. 
  1). 
  The 
  under 
  median 
  line 
  of 
  tlie 
  

   segments 
  forms 
  a 
  distinct 
  carina 
  (Pl. 
  II, 
  fig. 
  II). 
  

  

  The 
  jyleoii 
  andurus 
  are 
  fnsed 
  together 
  into 
  a 
  broad, 
  clypeate 
  

   segment 
  with 
  rounded 
  margins, 
  posteriorly 
  produced 
  into 
  two 
  

   sharp 
  angles, 
  broad, 
  flat, 
  and 
  corresponding 
  with 
  the 
  cornua 
  of 
  

   the 
  preceding 
  segments 
  (Pl. 
  I, 
  fig. 
  I, 
  Pl. 
  III, 
  fig. 
  29). 
  Between 
  

   these 
  angles, 
  at 
  their 
  base, 
  is 
  a 
  deep 
  hoUow 
  for 
  the 
  insertion 
  

   of 
  the 
  last 
  pair 
  of 
  uropoda. 
  The 
  dorsal 
  side 
  of 
  the 
  seg- 
  

   ment 
  is 
  convex 
  with 
  a 
  conical 
  spine 
  in 
  the 
  middle 
  and 
  two 
  

   longitudinal 
  furrows. 
  At 
  the 
  under 
  side, 
  the 
  segment 
  is 
  deeply 
  

   hollowed 
  to 
  receive 
  the 
  branchial 
  feet. 
  

  

  The 
  eyes 
  are 
  small, 
  oval, 
  tolerably 
  prominent, 
  and 
  verv 
  

   distant, 
  situated 
  över 
  the 
  bases 
  of 
  the 
  external 
  antennae 
  at 
  the 
  

   base 
  of 
  the 
  lateral 
  cornua 
  (Pl. 
  I, 
  fig. 
  2). 
  

  

  The 
  inner 
  or 
  upper 
  Antennce 
  are 
  fixed 
  at 
  the 
  under 
  

   side 
  of 
  the 
  base 
  of 
  the 
  rostrum 
  and 
  separated 
  by 
  it. 
  The 
  

   peduncle 
  is 
  three-articulated, 
  the 
  basal 
  artide 
  longer 
  and 
  

   broader 
  than 
  the 
  following, 
  fixed 
  on 
  a 
  tuberculous 
  prominence 
  

   of 
  the 
  cephalon, 
  the 
  second 
  article 
  is 
  equal 
  in 
  length, 
  but 
  much 
  

   narrower; 
  the 
  upper 
  margin 
  is 
  tipped 
  with 
  some 
  hairs; 
  the 
  

   last 
  article 
  is 
  shorter 
  and 
  narrower, 
  ciliated 
  at 
  the 
  upper 
  

   end, 
  carrying 
  one 
  or 
  two 
  auditory 
  bristles 
  (Pl. 
  I, 
  f. 
  9). 
  The 
  

   flagellum 
  is 
  multiarticulate 
  (with 
  60 
  to 
  70 
  articuli), 
  the 
  first 
  

   and 
  second 
  greater, 
  the 
  second 
  twice 
  as 
  long 
  as 
  the 
  first; 
  the 
  

   remainder 
  subsequal, 
  decreasing 
  in 
  breadth 
  to 
  the 
  top. 
  Many 
  

   of 
  the 
  artides 
  carry 
  on 
  their 
  upper 
  margin 
  an 
  olfactorv 
  

   gland 
  and 
  two 
  long, 
  unciliate 
  hairs 
  (Pl. 
  I, 
  fig. 
  5 
  a. 
  6). 
  The 
  

   length 
  of 
  the 
  inner 
  antennas 
  is 
  a 
  third 
  of 
  that 
  of 
  the 
  outer 
  

   ones; 
  they 
  reach 
  to 
  the 
  middle 
  of 
  the 
  last 
  article 
  of 
  the 
  

   peduncles. 
  The 
  second 
  article 
  of 
  the 
  peduncle 
  carries 
  no 
  

   appendicular 
  lamina 
  as 
  in 
  the 
  Janira. 
  

  

  The 
  outer 
  or 
  inferior 
  Antennce 
  (Pl. 
  I, 
  fig. 
  7) 
  are 
  fixed 
  

   under 
  the 
  arched 
  frontal 
  margins 
  of 
  the 
  cephalon. 
  The 
  peduncle 
  

   is 
  five-jointed 
  ; 
  the 
  first 
  article 
  is 
  small 
  and 
  short, 
  the 
  following 
  

   a 
  little 
  longer; 
  the 
  third 
  is 
  longer 
  and 
  carries 
  at 
  the 
  upper 
  outer 
  

   margin 
  a 
  long, 
  strong 
  tooth, 
  the 
  fourth 
  article 
  is 
  shorter 
  

   and 
  narrower, 
  the 
  fifth 
  longer 
  than 
  all 
  the 
  preceding 
  together; 
  

   the 
  iTiargins 
  are 
  provided 
  with 
  fine, 
  short 
  hairs. 
  The 
  flagel- 
  

   lum 
  is 
  multi-articulate, 
  twice 
  as 
  long 
  as 
  the 
  peduncle 
  ; 
  the 
  

   joints 
  are 
  short 
  and 
  broad, 
  almost 
  280 
  in 
  number; 
  they 
  

  

  