﻿PLATE 
  LVII. 
  

  

  Benthesicymus 
  hrasiliensis 
  (p. 
  332). 
  

   Fie. 
  1. 
  Lateral 
  view. 
  

  

  Ibr. 
  Section 
  of 
  a 
  branchial 
  plume. 
  

  

  Benthesicymus 
  pleocanthus 
  (p. 
  334). 
  

   2. 
  Lateral 
  view. 
  

   2hr. 
  Section 
  of 
  branchial 
  plume. 
  

  

  Benthesicymus 
  iridescens 
  (p. 
  335). 
  

   ,, 
  3. 
  Lateral 
  view. 
  

   ,, 
  3a. 
  Ophthalmopod. 
  

  

  Sa". 
  Diagrammatic 
  section 
  of 
  eye. 
  

  

  Shr. 
  Branch 
  of 
  a 
  branchial 
  plume. 
  

  

  