﻿North 
  American 
  Diatomaceae 
  69 
  

  

  In 
  outline, 
  but 
  the 
  striae 
  are 
  not 
  marginal. 
  The 
  species 
  was 
  sent 
  

   to 
  me 
  by 
  Professor 
  C. 
  J. 
  Elmore, 
  Westminster 
  College, 
  Missouri. 
  

  

  Eunotia 
  Stevensonii 
  sp. 
  nov. 
  

  

  " 
  Valves 
  with 
  arcuate 
  dorsal 
  margin 
  and 
  straight 
  or 
  slightly 
  

   concave 
  ventral 
  margin 
  tumid 
  in 
  the 
  middle. 
  Apices 
  broad 
  and 
  

  

  rounded. 
  Striae 
  ten 
  or 
  eleven 
  In 
  lo/x, 
  punctate. 
  A 
  sutural 
  line 
  

   or 
  pseudoraphe 
  extends 
  between 
  the 
  terminal 
  nodules 
  as 
  in 
  

   E. 
  americana 
  Kain 
  & 
  Schultze, 
  E. 
  Clevei 
  Grun. 
  and 
  others. 
  

   Length 
  of 
  valve 
  88-113 
  ju. 
  [Figs. 
  12, 
  13.] 
  

  

  Type 
  locality: 
  pond 
  near 
  Lake 
  Sunapee, 
  New 
  Hampshlre. 
  

  

  Distribution: 
  fresh 
  water 
  (fossil), 
  in 
  the 
  Monmouth, 
  Maine, 
  

  

  peat 
  deposit. 
  

  

  I 
  take 
  pleasure 
  in 
  naming 
  this 
  species 
  after 
  Mr. 
  William 
  C. 
  

   Stevenson, 
  Jr., 
  mycologist, 
  of 
  Philadelphia, 
  to 
  whom 
  I 
  am 
  indebted 
  

   for 
  numerous 
  specimens. 
  

  

  ■ 
  

  

  Navicula 
  Attwoodii 
  M. 
  Perag. 
  in 
  Tempere, 
  Diatomees 
  du 
  

  

  monde 
  entier 
  100. 
  1915. 
  

  

  Valves 
  linear-elliptical, 
  with 
  broad, 
  rounded 
  ends. 
  Median 
  

   line 
  linear, 
  narrow. 
  Median 
  pores 
  somewhat 
  Incrassate. 
  Terminal 
  

   fissures 
  Indistinct. 
  Striae 
  finely 
  lineate, 
  ten 
  to 
  twelve 
  in 
  10 
  ju, 
  

   radiate 
  In 
  the 
  middle, 
  slightly 
  convergent 
  at 
  the 
  ends, 
  interrupted 
  

   in 
  the 
  middle 
  by 
  a 
  broad 
  expanding 
  fascia 
  reaching 
  the 
  margin. 
  

   Length 
  of 
  valve 
  40-50 
  ju. 
  [FiG. 
  9.] 
  

  

  Type 
  locality; 
  Quinnipiac, 
  Connecticut. 
  

  

  marine 
  

  

  • 
  * 
  

  

  vicinity. 
  

  

  Mr 
  

  

  who 
  has 
  collected 
  numerous 
  specimens; 
  identifies 
  it 
  as 
  Peragallo's 
  

   species 
  which, 
  I 
  believe, 
  has 
  not 
  been 
  figured. 
  

  

  Pinnularia 
  Hagelsteinii 
  sp. 
  nov. 
  

  

  Valves 
  rhombic-lanceolate, 
  with 
  produced, 
  rounded 
  ends. 
  

  

  Length 
  

  

  mareflnal, 
  absent 
  from 
  the 
  middle 
  

   the 
  middle, 
  

  

  of 
  valve 
  60 
  jLi. 
  [Fig. 
  7.] 
  

  

  Type 
  locality 
  : 
  near 
  Bliss, 
  Idaho. 
  

  

  Distribution: 
  fresh 
  water 
  (fossil), 
  known 
  from 
  the 
  type 
  

  

  locality 
  only; 
  rather 
  rare. 
  

  

  