﻿TBOCHUS. 
  Panama 
  Shells. 
  416 
  

  

  Trochus 
  {Monodonta) 
  catenulatus 
  Menke 
  in 
  Zeitschr. 
  f. 
  Malak. 
  vol. 
  

  

  for 
  1850. 
  p. 
  173. 
  - 
  - 
  Apr. 
  1851. 
  

  

  This 
  species 
  belongs 
  to 
  the 
  subgenus 
  Modulus. 
  Its 
  Carib- 
  

   bean 
  analogue 
  is 
  T. 
  angulatus 
  Ad. 
  

  

  Station. 
  — 
  Unknown. 
  

  

  Habitat. 
  — 
  Mazatlan 
  ; 
  Melchers 
  I 
  Menke. 
  

  

  Taboga 
  ; 
  C. 
  B. 
  A. 
  ! 
  

   23 
  specimens 
  were 
  collected 
  in 
  various 
  states 
  of 
  preserva- 
  

   tion. 
  

  

  274. 
  Trochus 
  coroniilatus. 
  Nov. 
  sp. 
  

  

  Shell 
  conic, 
  moderately 
  elevated, 
  thick: 
  dingy 
  white, 
  with 
  

   broad 
  reddish 
  brown 
  oblique 
  flammules, 
  with 
  the 
  nodules 
  pale 
  

   red 
  : 
  with 
  minutely 
  undulated 
  spiral 
  raised 
  lines 
  : 
  anteriorly 
  

   with 
  tour 
  or 
  five 
  larger 
  raised 
  lines 
  : 
  with, 
  on 
  the 
  periphery 
  of 
  

   the 
  last 
  whorl, 
  twu 
  spiral 
  nodulous 
  keels, 
  of 
  which 
  one 
  appears 
  

   on 
  the 
  spire 
  : 
  with 
  a 
  series 
  of 
  larger 
  nodules 
  on 
  the 
  shouldered 
  

   margin 
  of 
  the 
  whorls 
  : 
  spire 
  with 
  the 
  outlines 
  moderately 
  curvi- 
  

   linear 
  : 
  apex 
  subacute 
  : 
  whorls 
  six, 
  planulate 
  above 
  the 
  keels, 
  

   with 
  the 
  suture 
  broadly 
  and 
  deeply 
  canaliculate 
  : 
  aperture 
  

   nearly 
  orbicular: 
  labrum 
  much 
  advanced 
  in 
  the 
  upper 
  part: 
  

   columella 
  bidentate 
  : 
  umbilicus 
  one 
  third 
  as 
  wide 
  as 
  the 
  aper- 
  

   ture, 
  reaching 
  to 
  the 
  apex. 
  

  

  Mean 
  divergence 
  about 
  90° 
  ; 
  length 
  .55 
  inch 
  ; 
  greatest 
  breadth 
  

   .72 
  inch 
  ; 
  least 
  breadth 
  .6 
  inch. 
  

  

  Station. 
  — 
  Unknown, 
  

  

  Habitat.— 
  Tahogsi] 
  C. 
  B. 
  A. 
  1 
  

   We 
  found 
  2 
  specimens. 
  

  

  275. 
  Trochus 
  Leanus. 
  Nov. 
  sp. 
  

  

  Shell 
  conic, 
  well 
  elevated 
  : 
  pale 
  yellowish 
  or 
  reddish 
  brown, 
  

   with 
  broad 
  dark 
  brown 
  oblique 
  flammules 
  ; 
  anteriorly 
  some- 
  

   what 
  articulated 
  with 
  red 
  and 
  yellowish 
  white 
  in 
  fine 
  con- 
  

  

  