﻿82 
  PKOCEEDINGS 
  OF 
  THE 
  CALIFORNIA 
  

  

  down 
  on 
  the 
  umbos 
  ; 
  lower 
  anterior 
  margin 
  curved, 
  forming 
  a 
  large 
  elliptic-oval 
  

   gape 
  ; 
  po?terii 
  r 
  end 
  of 
  valves 
  squarely 
  rounded 
  ; 
  shell 
  dull 
  chalky 
  white, 
  sculp- 
  

   tured 
  in 
  concentric 
  lines, 
  which 
  anteriorly 
  are 
  laminated 
  and 
  posteriorly 
  become 
  

   extinct 
  ; 
  valves 
  radiately 
  ribbed, 
  which 
  also 
  become 
  obsolete 
  at 
  the 
  posterior 
  

   end 
  ; 
  at 
  the 
  intersection 
  of 
  the 
  radiating 
  and 
  concentric 
  lines 
  the 
  sculpture 
  is 
  

   pectinated 
  ; 
  an 
  area 
  below 
  the 
  umbos 
  nearly 
  or 
  quite 
  destitute 
  of 
  sculpture, 
  

   which 
  varies 
  much 
  in 
  prominence 
  in 
  different 
  specimens 
  ; 
  accessory 
  plate 
  sub- 
  

   lanceolate 
  and 
  bent 
  down 
  on 
  the 
  beaks, 
  anteriorly 
  prolonged, 
  but 
  not 
  wholly 
  

   covering 
  the 
  ante-umbonal 
  gape 
  ; 
  figs. 
  6a, 
  6b, 
  show 
  the 
  variation 
  in 
  the 
  shape 
  

   of 
  the 
  dorsal 
  plate 
  in 
  different 
  specimens 
  ; 
  interior 
  of 
  valves 
  white, 
  enamelled 
  ; 
  

   internal 
  rib 
  short, 
  curved 
  and 
  flattened. 
  Largest 
  specimen, 
  two 
  and 
  six-tenths 
  

   inches 
  in 
  length, 
  and 
  one 
  and 
  five-tenths 
  inches 
  in 
  height. 
  

  

  Habitat. 
  — 
  Alameda, 
  San 
  Francisco 
  Bay, 
  California, 
  where 
  in 
  some 
  places 
  it 
  

   is 
  common 
  in 
  sandy 
  mud 
  between 
  tide 
  marks. 
  Numerous 
  specimens 
  collected 
  

   by 
  Messrs. 
  Harford, 
  Hemphill, 
  Drs. 
  Kellogg 
  and 
  W. 
  P. 
  Gibbons. 
  

  

  This 
  shell 
  is 
  the 
  West 
  Coast 
  analogue 
  of 
  the 
  Atlantic 
  P. 
  truncata, 
  Say, 
  which 
  

   it 
  resembles 
  ; 
  it 
  is 
  however 
  a 
  much 
  longer 
  shell 
  for 
  its 
  width, 
  and 
  the 
  portion 
  of 
  

   the 
  valves 
  posterior 
  to 
  the 
  beaks, 
  very 
  much 
  longer 
  than 
  in 
  Say's 
  species. 
  Spec- 
  

   imens 
  of 
  this 
  species 
  have 
  been 
  distributed 
  as 
  Zirphcea 
  crispnta, 
  which 
  also 
  is 
  

   found 
  upon 
  the 
  coast, 
  though 
  quite 
  distinct 
  from 
  P. 
  Padfica, 
  which 
  latter 
  comes 
  

   within 
  Mr. 
  Tryon's 
  subgenus 
  Cyrtopletira. 
  

  

  According 
  to 
  the 
  Messrs. 
  Adams 
  in 
  the 
  genus 
  Pholas, 
  there 
  are 
  two 
  dorsal 
  

   plates 
  ; 
  yet 
  they 
  have 
  included 
  in 
  their 
  list 
  of 
  the 
  species 
  under 
  that 
  genus, 
  P. 
  

   truncata, 
  Say, 
  which 
  has 
  only 
  one. 
  

  

  Dr. 
  Kellogg 
  read 
  a 
  description 
  of 
  a 
  new 
  species 
  of 
  native 
  cotton 
  

   found 
  bj 
  Professor 
  Davidson 
  at 
  San 
  Jose 
  del 
  Cabo, 
  Lower 
  Califor- 
  

   nia, 
  lat. 
  23° 
  3', 
  a 
  plant 
  about 
  four 
  or 
  five 
  feet 
  high, 
  flowers 
  bright 
  

   straw 
  yellow 
  with 
  purple 
  centre, 
  fruit 
  not 
  seen, 
  and 
  which 
  may 
  be 
  

   called 
  Gossypium 
  Davidsonii, 
  Kellogg. 
  Also 
  a 
  new 
  species 
  of 
  

   Oonvolvulacoe 
  or 
  Golden 
  Morning 
  Glory, 
  Aniseia 
  aurea, 
  Kellogg 
  ; 
  

   a 
  beautiful 
  perennial 
  twining 
  vine, 
  collected 
  at 
  the 
  same 
  locaUty 
  

   with 
  the 
  preceding 
  by 
  Prof. 
  Davidson 
  in 
  March, 
  1873. 
  

  

  Descriptions 
  of 
  New 
  Plants 
  from 
  the 
  West 
  Coast 
  of 
  America. 
  

  

  BY 
  A. 
  KEi.LOGG, 
  M. 
  D. 
  

  

  Gossypium 
  Davidsonii, 
  Kellogg. 
  

  

  On 
  the 
  branches 
  bark 
  cinnamon 
  brown, 
  puberulent 
  and 
  sparsely 
  stellate 
  

   throughout, 
  the 
  extremities 
  villous 
  or 
  short 
  hirsute 
  and 
  somewhat 
  stellate, 
  with 
  

   black 
  spots 
  and 
  dark 
  glands 
  intermixed 
  on 
  twigs, 
  petioles, 
  leaves, 
  peduncles 
  and 
  

   floral 
  envelopes 
  and 
  flowers 
  ; 
  upper 
  leaves 
  roundish-cordate, 
  entire, 
  or 
  sub-entire, 
  

   (or 
  with 
  an 
  occasional 
  tooth, 
  indicative 
  of 
  a 
  pseudo 
  2 
  to 
  3-lobed 
  disposition), 
  

   acute, 
  or 
  abruptly 
  acuminate, 
  5-palmate-nerved, 
  densely 
  velvety 
  hirsute 
  on 
  both 
  

   surfaces 
  ; 
  a 
  single 
  oval 
  gland 
  on 
  the 
  midrib 
  beneath, 
  petioles 
  short 
  (about 
  half 
  

  

  