﻿1070 
  Forty- 
  seventh 
  Report 
  on 
  the 
  State 
  Museum. 
  

  

  Type, 
  Liothyrina 
  vitrea, 
  Born 
  (sp.). 
  

  

  Distribution. 
  Tertiary 
  — 
  Recent 
  (Arctic, 
  Lusitanian, 
  West 
  

   African, 
  Indo-Pacific, 
  Australo-Zealandian, 
  Japanese, 
  Californian, 
  

   Panamic, 
  Peruvian, 
  Magellanian, 
  Patagonian 
  and 
  Caribbean 
  

   Provinces). 
  

  

  Eucalathis, 
  Fischer 
  and 
  (Ehlert. 
  1890. 
  

  

  Shell 
  small, 
  auriculate 
  ; 
  valves 
  convex, 
  covered 
  with 
  radiating 
  

   plications. 
  In 
  the 
  interior 
  are 
  neither 
  dental 
  plates 
  nor 
  septa. 
  

   Cardinal 
  process 
  distinct. 
  Loop 
  short; 
  descending 
  branches 
  

   with 
  oral 
  processes 
  distinct, 
  and 
  directly 
  in 
  front 
  of 
  them 
  

   the 
  lamellae 
  are 
  deflected 
  into 
  a 
  transverse 
  band 
  which 
  

  

  Figs. 
  532, 
  533. 
  Eucalathis 
  Murrayi, 
  Davidson 
  (sp.). 
  (Davidson.) 
  

  

  bears 
  a 
  narrow 
  median 
  fold. 
  Brachia 
  but 
  slightly 
  dev- 
  

   eloped, 
  scarcely 
  longer 
  than 
  the 
  loop 
  and 
  arranged 
  in 
  two 
  

   lobes. 
  

  

  Type, 
  Eucalathis 
  Murrayi, 
  Davidson 
  (sp.). 
  

  

  Distribution. 
  Recent 
  (Lusitanian 
  Province). 
  

  

  Dyscolia, 
  Fischer 
  and 
  (Ehlert. 
  1890. 
  

  

  Shells 
  of 
  large 
  size, 
  sub 
  trigonal, 
  faintly 
  auriculate 
  ; 
  valves 
  con- 
  

   vex 
  with 
  radiating 
  surface 
  striae. 
  Beak 
  short, 
  foramen 
  large, 
  

   deltarium 
  concave, 
  transversely 
  striated, 
  much 
  thickened 
  in 
  old 
  

   shells. 
  On 
  the 
  interior 
  neither 
  septum 
  nor 
  dental 
  plates. 
  In 
  the 
  

   brachial 
  valve 
  there 
  is 
  no 
  hinge 
  plate. 
  Loop 
  broad 
  and 
  short, 
  

   descending 
  processes 
  united 
  anteriorly 
  by 
  a 
  transverse 
  band 
  as 
  in 
  

   Liothyrina. 
  Brachia 
  represented 
  by 
  a 
  sub 
  rectangular 
  brachial 
  

  

  128 
  

  

  