﻿246 
  Transactions. 
  — 
  Zoology, 
  

  

  Group 
  Abebrantia. 
  

   Coxae 
  of 
  the 
  pereiopoda 
  not 
  squamiformly 
  developed, 
  some, 
  or 
  all, 
  

   being 
  fused 
  to 
  their 
  respective 
  segments. 
  One 
  or 
  more 
  segments 
  of 
  the 
  

   pleon 
  absent. 
  

  

  . 
  Fam. 
  CaprellidEe. 
  

   Pleon 
  rudimentary. 
  Oral 
  appendages 
  normally 
  developed. 
  Coxae 
  fused 
  

   vs^ith 
  the 
  pereiou. 
  Branchial 
  sacs 
  attached 
  to 
  the 
  first 
  two 
  or 
  three 
  

   segments 
  of 
  the 
  pereion. 
  

  

  Genus 
  I. 
  Caprella, 
  Lamarck, 
  Syst. 
  des. 
  Anim. 
  sans 
  Vert., 
  p. 
  165; 
  

  

  Edwards, 
  Hist. 
  Nat. 
  Crust., 
  iii., 
  p. 
  105 
  ; 
  Spence 
  Bate, 
  Brit. 
  Mus. 
  

  

  Cat. 
  Ampliip. 
  Crust., 
  p. 
  353. 
  

  

  Body 
  cylindrical. 
  Ceplialon 
  and 
  first 
  segment 
  of 
  the 
  pereion 
  confluent. 
  

  

  Pleon 
  rudimentary. 
  Gnathopoda 
  subchelate. 
  First 
  two 
  pairs 
  of 
  pereiopoda 
  

  

  represented 
  by 
  the 
  branchia? 
  attached 
  to 
  their 
  respective 
  segments 
  only 
  ; 
  

  

  three 
  posterior 
  pairs 
  of 
  pereiopoda 
  subequal. 
  First 
  and 
  second 
  pairs 
  of 
  

  

  pleopoda 
  rudimentary 
  in 
  the 
  male 
  ; 
  the 
  rest 
  obsolete, 
  

  

  21. 
  Caprella 
  caudata, 
  nov. 
  sp. 
  Fig. 
  D.5. 
  

  

  Female. 
  Body 
  rather 
  robust. 
  Cephalon 
  smooth, 
  not 
  toothed 
  nor 
  

   tuberculate, 
  short 
  ; 
  four 
  succeeding 
  segments 
  of 
  pereion 
  subequal. 
  Eyes 
  

   round. 
  Superior 
  antennae 
  more 
  than 
  half 
  as 
  long 
  as 
  body; 
  first 
  joint 
  of 
  

   peduncle 
  with 
  an 
  acute 
  spine 
  on 
  the 
  antero-superior 
  margin 
  ; 
  second 
  joint 
  

   longest; 
  flagellum 
  about 
  15-jointed 
  (first 
  few 
  fused 
  together), 
  as 
  long 
  as 
  

   peduncle, 
  and 
  spinose 
  at 
  the 
  articulations. 
  Inferior 
  antennae 
  more 
  than 
  

   half 
  as 
  long 
  as 
  the 
  superior; 
  two 
  basal 
  joints 
  short 
  and 
  smooth 
  ; 
  the 
  rest 
  

   fringed 
  on 
  their 
  lower 
  margin 
  with 
  long 
  hairs. 
  Maxillipeds 
  well 
  developed, 
  

   unguiculate, 
  ciliate 
  on 
  the 
  lower 
  margin, 
  with 
  the 
  carpus 
  distended. 
  First 
  

   pair 
  of 
  gnathopoda 
  small 
  and 
  fringed 
  with 
  hairs 
  ; 
  carpus 
  with 
  a 
  deep 
  

   transverse 
  incision 
  ; 
  propodos 
  ovate, 
  dactylos 
  long 
  and 
  slender. 
  Second 
  

   pair 
  of 
  gnathopoda 
  large 
  ; 
  propodos 
  narrow-ovate, 
  with 
  the 
  palm 
  extend- 
  

   ing 
  along 
  the 
  greater 
  part 
  of 
  the 
  lower 
  margin, 
  with 
  a 
  large 
  tooth 
  

   surmounted 
  by 
  two 
  spines 
  to 
  receive 
  the 
  point 
  of 
  the 
  dactylos, 
  and 
  two 
  

   smaller 
  teeth 
  nearer 
  the 
  hinge 
  corresponding 
  to 
  two 
  indentations 
  in 
  the 
  

   dactylos 
  ; 
  dactylos 
  stout, 
  curved. 
  Branchiae 
  narrow-oblong. 
  Ovigerous 
  

   pouches 
  nearly 
  circular, 
  thickly 
  ciliated 
  on 
  their 
  inner 
  margins. 
  Three 
  last 
  

   pairs 
  of 
  pereiopoda 
  increasing 
  in 
  size 
  posteriorly, 
  similar 
  in 
  shape 
  ; 
  in 
  all 
  

   the 
  propodos 
  is 
  narrow, 
  excavate 
  along 
  its 
  anterior 
  margin 
  to 
  receive 
  the 
  

   slender 
  curved 
  dactylos, 
  point 
  of 
  impingement 
  of 
  which 
  is 
  marked 
  by 
  two 
  

   serrated 
  spines. 
  First 
  pair 
  of 
  pleopoda 
  rudimeutary, 
  represented 
  by 
  minute 
  

   tubercles. 
  Pleon 
  prolonged 
  iuto 
  a 
  slender 
  flat 
  expansion, 
  

   Dunedin, 
  in 
  rock 
  pools, 
  Length 
  -4 
  inch, 
  

  

  