﻿512 
  Miscellaneous. 
  

  

  MISCELLANEOUS. 
  

  

  On 
  an 
  Epicaridan 
  parasitic 
  on 
  an 
  Ampliipod, 
  and 
  on 
  a 
  Copepod 
  

   parasitic 
  on 
  an 
  Epicaridan. 
  By 
  MM. 
  A. 
  Giard 
  and 
  J. 
  Bonnier. 
  

  

  Hitherto 
  no 
  Epicaridan 
  parasitic 
  on 
  Amphipods 
  has 
  been 
  known. 
  

   In 
  September 
  last 
  Prof. 
  Delia 
  Yalle 
  collected 
  in 
  the 
  Bay 
  of 
  Naples 
  

   two 
  specimens 
  of 
  an 
  Isopod 
  parasitic 
  upon 
  Ampelisca 
  diadema, 
  A. 
  

   Costa, 
  and 
  hastened 
  to 
  send 
  them 
  to 
  us. 
  These 
  profoundly 
  degraded 
  

   Crustaceans 
  belong 
  to 
  the 
  group 
  of 
  the 
  Cryptoniscians. 
  They 
  are 
  

   adult 
  females, 
  one 
  of 
  them 
  containing 
  segmented 
  ova, 
  the 
  other 
  

   embryos 
  ready 
  to 
  hatch 
  and 
  possessing 
  the 
  typical 
  form 
  of 
  the 
  first 
  

   larva 
  of 
  the 
  Cryptoniscians. 
  

  

  The 
  whole 
  body 
  of 
  the 
  female 
  is, 
  so 
  to 
  speak, 
  converted 
  into 
  a 
  

   vast 
  incubatory 
  chamber, 
  closed 
  by 
  two 
  lateral 
  lamina) 
  extending 
  

   from 
  the 
  first 
  to 
  the 
  fifth 
  thoracic 
  segment, 
  and 
  united 
  in 
  the 
  median 
  

   line, 
  in 
  such 
  a 
  way 
  as 
  to 
  leave 
  apertures 
  for 
  the 
  passage 
  of 
  water 
  

   only 
  at 
  the 
  anterior 
  and 
  at 
  the 
  posterior 
  extremity. 
  

  

  On 
  the 
  dorsal 
  surface 
  may 
  be 
  distinguished 
  five 
  metameric 
  bands 
  

   representing 
  the 
  first 
  five 
  somites 
  of 
  the 
  thorax. 
  On 
  each 
  side 
  of 
  

   the 
  body, 
  behind 
  the 
  line 
  of 
  insertion 
  of 
  the 
  incubatory 
  plates, 
  wo 
  

   see 
  on 
  each 
  of 
  the 
  five 
  segments 
  conical 
  eminences, 
  probably 
  ves- 
  

   tiges 
  of 
  the 
  first 
  pairs 
  of 
  feet. 
  The 
  head, 
  which 
  is 
  strongly 
  indexed 
  

   in 
  front, 
  only 
  presents 
  rudiments 
  of 
  the 
  ordinary 
  appendages. 
  The 
  

   maxillipeds 
  alone 
  are 
  considerably 
  developed. 
  

  

  The 
  terminal 
  portion 
  of 
  the 
  body 
  from 
  the 
  sixth 
  thoracic 
  segment 
  

   is 
  also 
  bent 
  towards 
  the 
  ventral 
  surface, 
  so 
  as 
  to 
  complete 
  the 
  incu- 
  

   batory 
  chamber 
  by 
  a 
  posterior 
  cavity 
  likewise 
  filled 
  with 
  ova. 
  The 
  

   sixth 
  and 
  seventh 
  thoracic 
  segments 
  bear 
  each 
  a 
  pair 
  of 
  digitations 
  

   representing 
  the 
  aborted 
  appendages 
  and 
  protecting 
  the 
  posterior 
  

   opening 
  of 
  the 
  incubatory 
  chamber. 
  This 
  aperture 
  therefore 
  much 
  

   resembles 
  that 
  figured 
  by 
  Eraisse 
  in 
  Cryptoniscus 
  paguri, 
  Er., 
  but 
  

   the 
  margin 
  of 
  the 
  lamellae 
  is 
  simply 
  thickened 
  and 
  does 
  not 
  ter- 
  

   minate 
  in 
  chitinons 
  ramifications. 
  

  

  The 
  liver 
  forms 
  a 
  gland 
  faintly 
  bilobed 
  behind 
  and 
  of 
  small 
  size. 
  

   It 
  scarcely 
  penetrates 
  into 
  the 
  thoracic 
  region. 
  The 
  digestive 
  tube 
  

   becomes 
  dilated 
  in 
  the 
  rectal 
  part, 
  to 
  give 
  origin 
  to 
  the 
  ovoid 
  organ 
  

   characteristic 
  of 
  the 
  Cryptoniscians. 
  It 
  terminates 
  at 
  an 
  anus 
  

   situated 
  ventrally 
  at 
  the 
  apex 
  of 
  the 
  pleal 
  mamilla, 
  upon 
  which 
  

   traces 
  of 
  pleopoda 
  may 
  be 
  distinguished. 
  

  

  This 
  curious 
  Epicaridan 
  differs 
  greatly 
  from 
  the 
  genus 
  Cabirops, 
  

   Kossmann, 
  which 
  is 
  parasitic 
  upon 
  the 
  Bopyri 
  ; 
  it 
  more 
  resembles 
  

   Cryptothiria 
  (?) 
  marsupialis, 
  G. 
  0. 
  Sars, 
  parasitic 
  on 
  the 
  Munnops- 
  

   idae 
  (Eurycope 
  cornuta 
  and 
  Hyarachna 
  longicornis). 
  But, 
  like 
  the 
  

   latter, 
  it 
  must 
  incontestably 
  be 
  taken 
  as 
  the 
  type 
  of 
  a 
  new 
  genus. 
  

   "VVe 
  shall 
  give 
  the 
  name 
  of 
  Podascon 
  Delia 
  Valid 
  to 
  the 
  parasite 
  of 
  

   Ampelisca 
  diadema. 
  

  

  