﻿Report 
  of 
  the 
  State 
  Geologist, 
  

  

  1093 
  

  

  (Type, 
  Lacazella 
  Mediterranea, 
  Risso 
  (sp.). 
  Recent 
  (Mediter- 
  

   ranean) 
  ; 
  Fossil 
  ; 
  Jurassic. 
  — 
  Tertiary. 
  

  

  Figs. 
  645, 
  646. 
  Lacazella 
  Mediterranean 
  Risso 
  (sp.). 
  (Davidson). 
  

  

  Subgenus 
  Thecidiopsis, 
  Munier-Chalmas. 
  1887. 
  

   Interior 
  of 
  the 
  brachial 
  valve 
  bearing 
  a 
  median 
  septum 
  with 
  

   many 
  branches 
  and 
  simple 
  lateral 
  marginal 
  septa. 
  Internal 
  

   surface, 
  septa 
  and 
  brachial 
  lamella 
  covered 
  with 
  granulations. 
  

  

  Figs. 
  647-649. 
  Thecidiopsis 
  digitata, 
  Sowerby 
  (sp.). 
  (Quenstedt.) 
  

  

  (Type, 
  Thecidiopsis 
  digitata, 
  So 
  werby 
  (sp.) 
  , 
  Cretaceous.) 
  

  

  Subgenus 
  Thecidella, 
  Munier-Chalmas. 
  1887. 
  

   Shells 
  subtrigonal, 
  generally 
  transverse 
  ; 
  with 
  straight 
  hinge- 
  

   line, 
  well-developed 
  cardinal 
  area 
  and 
  deltidium. 
  In 
  the 
  

   brachial 
  valve 
  the 
  median 
  septum 
  is 
  broad, 
  elevated 
  on 
  its 
  lateral 
  

  

  Fig. 
  650. 
  Thecidella 
  Normaniana, 
  Munier-Chalmas. 
  (OEhlert.) 
  

  

  margins, 
  concave 
  on 
  its 
  upper 
  surface 
  and 
  irregularly 
  perforated. 
  

   Lateral 
  lobes 
  of 
  the 
  brachial 
  lamellae 
  simple. 
  

  

  (Type, 
  Thecidella 
  Normaniana, 
  Munier-Chalmas. 
  Lias. 
  

  

  151 
  

  

  