In  this  Beport  will  be  found  a  paper,  illustrated  by  three  plates
of  figures,  by  Dr.  Thomas  Scott,  descriptive  of  a  number  of  rare
Crustacea,  obtained  for  the  most  part  during  the  trawling  investi-
gations. The  forms  described  are  all  small,  and  include  two  groups
of  the  Copepoda  that  are  somewhat  abnormal  both  in  their
structure  and  habits.  Among  the  nine  species  belonging  to  the
first  of  these  groups — the  Monstrillidse — three  are  new  to  science
and  are  now  described  for  the  first  time,  and  of  the  seven  species
which  belong  to  the  second  of  the  groups — the  Choniostomatid» —
five  are  new  to  science  and  are  here  described  for  the  first  time,


.  of  the  Fishery  Board  for  Scotlaiid,  11

and  these  are  all  minute  forms  which  are  parasitic  on  small  species
of  Crustacea.
The  occurrence  of  other  rare  species  belonging  to  the  Amphi-
poda,  the  Isopoda,  and  the  Sympoda,  other  groups  of  Crustacea,
is  also  recorded.
Apart  from  the  zoological  interest  of  these  discoveries,  it  is  to
be  noted  that  the  minute  Crustacea  with  which  they  deal  play  an
important  rdle  in  connection  with  the  food  of  fishes,  many  forms
living  upon  them  almost  exclusively  at  some  stage  or  another  of
their  existence.
The  Parasites  of  Fishes.
