﻿ACADEMY 
  OF 
  SCIENCES. 
  69 
  

  

  Habitat. 
  — 
  30 
  to 
  60 
  fathoms 
  stony 
  mud 
  in 
  Captain's 
  Harbor, 
  Unalaslika, 
  Al- 
  

   eutian 
  Islands; 
  three 
  living 
  specimens. 
  Cancellaria 
  modcsta, 
  Cpr., 
  was 
  also 
  

   found 
  here, 
  but 
  not 
  in 
  the 
  deeper 
  water. 
  

  

  Cancellaria 
  (Trigonostoina) 
  circiancincta, 
  n. 
  s. 
  PI. 
  H, 
  fig. 
  2. 
  

  

  Shell 
  similar 
  in 
  form 
  to 
  the 
  last, 
  with 
  si.x 
  whorls, 
  nucleus 
  minute 
  and 
  nearly- 
  

   smooth 
  ; 
  thin 
  and 
  delicate 
  ; 
  whorls 
  sculptured 
  with 
  strong 
  revolving 
  ridges, 
  gen- 
  

   erally 
  subequal, 
  but 
  with 
  a 
  few 
  more 
  slender 
  intercalary 
  threads 
  ; 
  turns 
  gently 
  

   rounded 
  with 
  a 
  very 
  slight 
  tendency 
  to 
  tabulation 
  toward 
  the 
  posterior 
  third 
  of 
  

   the 
  whorl 
  ; 
  crossed 
  by 
  very 
  faint 
  transverse 
  irregular 
  riblets, 
  which 
  are 
  most 
  

   evident 
  on 
  the 
  apical 
  whorls 
  and 
  evanescent 
  on 
  the 
  body 
  whorl, 
  and 
  show 
  a 
  

   slight 
  tendency 
  to 
  granulation 
  at 
  the 
  intersections 
  only 
  on 
  the 
  first 
  two 
  or 
  three 
  

   whorls. 
  Color 
  rose 
  pink, 
  strongest 
  on 
  the 
  ridges. 
  Outer 
  lip 
  thin, 
  delicate, 
  the 
  

   sculpture 
  of 
  the 
  exterior 
  showing 
  through 
  ; 
  inner 
  lip 
  not 
  thickened 
  ; 
  columella 
  

   white 
  with 
  two 
  or 
  three 
  very 
  faint 
  plicaj. 
  Animal 
  slate 
  color. 
  Canal 
  short 
  but 
  

   deeper 
  than 
  in 
  the 
  last 
  species. 
  Lon., 
  0.82 
  in.; 
  lat., 
  0.37 
  in.; 
  dofl., 
  40°. 
  

  

  Habitat. 
  — 
  Popoff 
  Strait, 
  Shumagia 
  Islands, 
  in 
  ten 
  fathoms 
  stony 
  mud 
  about 
  

   the 
  reefs. 
  

  

  Sipho 
  HaUii, 
  n. 
  s. 
  PI. 
  II, 
  fig. 
  3. 
  

  

  Shell 
  fusiform, 
  solid 
  and 
  heavy, 
  of 
  five 
  and 
  a 
  half 
  whorls, 
  the. 
  last 
  much 
  the 
  

   largest 
  ; 
  suture 
  subcanaliculate, 
  not 
  deep, 
  but 
  very 
  distinct 
  ; 
  whorls 
  moderately 
  

   convex, 
  somewhat 
  appressed 
  toward 
  the 
  suture. 
  Canal 
  rather 
  long, 
  much 
  re- 
  

   curved 
  ; 
  aperture 
  elongate, 
  acute 
  behind 
  ; 
  inner 
  lip 
  much 
  thickened, 
  white 
  ; 
  

   outer 
  lip 
  hardly 
  thickened, 
  posteriorly 
  waved. 
  Shell 
  covered 
  with 
  a 
  yellow- 
  

   brown 
  epidermis, 
  with 
  very 
  faint 
  revolving 
  striae, 
  crossing 
  the 
  slightly 
  evident 
  

   waved 
  lines 
  of 
  growth. 
  

  

  Lon., 
  1.7 
  in.; 
  lat., 
  0.8 
  in.; 
  lon. 
  apert. 
  0.95 
  in.; 
  defl. 
  45°. 
  

  

  Habitat.— 
  Sanborn 
  Harbor, 
  Nagai 
  ; 
  three 
  dead 
  specimens, 
  with 
  Paguri, 
  

   found 
  by 
  Capt. 
  W. 
  G. 
  Hall, 
  sailing 
  master 
  of 
  the 
  U. 
  ^. 
  C. 
  S. 
  Schr. 
  Humboldt, 
  

   to 
  whom 
  I 
  am 
  indebted 
  for 
  many 
  valuable 
  additions 
  to 
  our 
  collections. 
  

  

  This 
  species 
  is 
  smaller 
  and 
  more 
  solid 
  than 
  most 
  of 
  the 
  genus, 
  and 
  does 
  not 
  

   resemble 
  any 
  of 
  the 
  east 
  coast 
  species 
  closely 
  enough 
  to 
  require 
  a 
  comparison. 
  

   It 
  has 
  a 
  little 
  the 
  aspect 
  of 
  a 
  Campeloma, 
  in 
  some 
  of 
  its 
  characters. 
  

  

  Margarita 
  vorticifera, 
  n. 
  s. 
  PI. 
  II, 
  fig. 
  4, 
  a, 
  b, 
  c. 
  

  

  Shell 
  depressed, 
  with 
  three 
  flattened, 
  rapidly 
  expanding 
  whorls, 
  which 
  have 
  a 
  

   tendency, 
  in 
  old 
  individuals, 
  to 
  overhang 
  the 
  suture 
  anterior 
  to 
  them. 
  The 
  

   upper 
  surface 
  is 
  traversed 
  by 
  numerous 
  slender, 
  slightly 
  elevated, 
  revolving 
  

   threads, 
  which 
  are 
  crossed 
  by 
  faint 
  lines 
  of 
  growth. 
  Outer 
  edge 
  of 
  whorls 
  sub- 
  

   carinate. 
  The 
  basal 
  surface 
  is 
  less 
  flattened, 
  but 
  similarly 
  sculptured, 
  except 
  

   that 
  the 
  very 
  wide 
  and 
  funnel-shaped 
  umbilicus 
  is 
  destitute 
  of 
  revolving 
  strice, 
  

   and 
  the 
  lines 
  of 
  growth 
  are 
  here 
  a 
  little 
  stronger. 
  Aperture 
  excessively 
  oblique, 
  

   with 
  the 
  anterior 
  angle 
  much 
  produced 
  ; 
  lips 
  hardly 
  thickened, 
  and 
  but 
  slightly 
  

   interrupted 
  at 
  the 
  junction 
  with 
  the 
  body 
  whorl. 
  Nacre, 
  salmon-color; 
  exter- 
  

  

  