337 
of  the  anterior  somites  ochraceous;  rostrum,  antennae  and  legs  testaceous. 
Head  about  as  long  as  the  rostrum;  rostrum  long,  slender,  lightly 
curved  and  pointed  ;  antennae  about  as  long  as  the  head  and  rostrum 
taken  together,  the  2**,  3^,  4*  and  5**  segments  subequal  in  length. 
Legs  short,  with  the  segments  not  manifestly  unequal  in  length. 
Number  of  segments  44—63. 
Length  of  largest  specimen  about  15  mm.  width  about  1  mm. 
34.  Siphonophora  vittata  sp.  n.  Pl.  XX,  fig.  4  — 4a. 
Flores  :  Maumerie.  A  large  number  of  specimens. 
Colour  entirely  yellowish  white,  with  a  fine  median  dorsal  fus- 
cous band. 
Head  about  as  long  as  the  rostrum,  which  is  long  curved  and 
pointed  at  the  end;  antennae  about  as  long  as  the  head  and  rostrum 
taken  together,  the  2*a,  3^,  4<*  and  5^  segments  gradually  increas- 
ing in  length  and  width. 
Number  of  segments  50—80. 
Length  of  largest  specimen  22  mm.;  width  1.2. 
This  species  does  not  seem  to  differ  from  the  preceding  in  any  im- 
portant particulars  except  colour. 
Family  POLYZONIDAE. 
Gervais.  Ann.  Sei.  Nat.  (3),  Zool.  II,  p.  70  (1844). 
Head  triangular  pointed  below. 
Eyes  present,  consisting  of  one  or  more  ocelli,  situated  obliquely  on 
the  inner  side  of  the  articulation  of  the  antennae. 
Antennae  large,  the  segments  subequal  in  size. 
Mandibles  reduced  but  not  entirely  obsolete  (?  always). 
Gnathochilarium  showing  traces  at  its  distal  end  of  separate  pieces. 
(?  always). 
Segments  smooth;  pleurae  united  with  the  terga,  though  the  line 
of  union  is  often  obvious. 
First  segment  smaller  than  the  2*a  and  not  closely  embracing  the 
sides  of  the  head. 
Sub-family  Polyzonini. 
Body  long  and  narrow  or  robust. 
The  line  of  union  between  the  pleurae  and  the  terga  clearly  repre- 
