﻿ACADEMY 
  OF 
  SCIENCES. 
  61 
  

  

  All 
  these 
  varieties 
  of 
  the 
  well 
  known 
  Buccinum 
  glaciale, 
  are 
  beautifully 
  and 
  

   thoroughly 
  connected 
  by 
  the 
  really 
  magnificent 
  series 
  of 
  that 
  species 
  obtained 
  

   by 
  us 
  during 
  the 
  season 
  of 
  1871-2, 
  in 
  the 
  Aleutian 
  Islands. 
  It 
  belongs 
  to 
  the 
  

   Arctic 
  fauna. 
  

  

  2. 
  Volutopsis 
  Beringi 
  (Midd..) 
  A. 
  Ad. 
  

  

  Trilonium 
  Beringi, 
  Midd. 
  Mai. 
  Eos. 
  p. 
  147, 
  pi. 
  iii, 
  f. 
  5-6. 
  1849. 
  

   (? 
  Volutopsis 
  norvegica, 
  Chemn., 
  N. 
  European 
  seas.) 
  

   Neptunea 
  castanea, 
  Mcerch., 
  p. 
  7, 
  pi. 
  1, 
  f. 
  1-2.= 
  

   Neptunen 
  badia, 
  Moerch. 
  (on 
  plate.) 
  

  

  This 
  species, 
  if 
  not 
  identical 
  with 
  the 
  European 
  form, 
  is 
  a 
  member 
  of 
  the 
  typi- 
  

   cal 
  Aleutian 
  fauna. 
  

  

  3. 
  Chrysodomus 
  {Helioiro'pis) 
  harpa, 
  Dall, 
  ex 
  Mcerch. 
  

   Neptunea 
  harpa, 
  Mcerch., 
  p. 
  2, 
  pi. 
  1, 
  f. 
  3-4. 
  

  

  This 
  is 
  an 
  Aleutian 
  species, 
  found 
  from 
  the 
  Shumagins 
  to 
  Unalashka, 
  but 
  

   everywhere 
  very 
  rare. 
  

  

  It 
  belongs 
  to 
  a 
  group 
  characterized 
  by 
  thin 
  sinistral 
  shells, 
  with 
  mammillated 
  

   apices 
  ; 
  an 
  operculum 
  very 
  small 
  when 
  compared 
  with 
  the 
  size 
  of 
  the 
  animal 
  ; 
  

   solitary 
  ovicapsules 
  of 
  hemispherical 
  form, 
  attached 
  by 
  the 
  entire 
  base, 
  smooth 
  

   above, 
  and 
  maturing 
  only 
  two 
  or 
  three 
  individuals 
  to 
  each 
  sac, 
  although 
  of 
  

   much 
  greater 
  size 
  than 
  the 
  ovicapsule 
  of 
  any 
  other 
  species 
  of 
  mollusk 
  in 
  the 
  

   region 
  ; 
  and, 
  probably, 
  by 
  dentition. 
  This 
  group 
  may 
  take 
  the 
  sub-generic 
  

   name 
  of 
  Heliotropis. 
  Our 
  largest 
  specimen 
  exceeded 
  six 
  inches 
  in 
  length. 
  Fus- 
  

   us 
  contrarius, 
  of 
  authors, 
  of 
  the 
  North 
  European 
  seas, 
  may 
  also 
  belong 
  to 
  this 
  

   group. 
  

  

  Buccinum 
  Dalei, 
  Sby., 
  or 
  a 
  related 
  form, 
  was 
  found 
  by 
  us 
  at 
  the 
  Shumagins. 
  

  

  Fleurotoma 
  circinaia, 
  n. 
  s. 
  PI. 
  II, 
  f. 
  5. 
  

  

  Shell 
  slender, 
  elongate, 
  covered 
  with 
  a 
  brownish 
  epidermis 
  ; 
  whorls 
  six, 
  with 
  

   a 
  single, 
  sharp, 
  narrow 
  carina, 
  about 
  the 
  middle 
  of 
  the 
  whorl, 
  in 
  the 
  upper 
  

   whorls 
  ; 
  this 
  carina 
  does 
  not 
  interrupt 
  the 
  even 
  rotundity 
  of 
  the 
  whorls 
  so 
  as 
  to 
  

   produce 
  any 
  flattening 
  of 
  the 
  latter, 
  but 
  appears 
  as 
  if 
  it 
  had 
  been 
  placed 
  upon 
  

   the 
  equator 
  of 
  the 
  whorl, 
  after 
  the 
  latter 
  had 
  been 
  completed. 
  The 
  posterior 
  

   surface 
  of 
  the 
  carina 
  and 
  that 
  part 
  of 
  the 
  whorls 
  behind 
  it, 
  are 
  destitute 
  of 
  any 
  

   but 
  the 
  most 
  microscopic 
  revolving 
  striiB, 
  though 
  plainly 
  marked 
  by 
  the 
  deeply 
  

   notched 
  lines 
  of 
  growth. 
  The 
  anterior 
  surface 
  of 
  carina 
  and 
  whorls 
  isvcovered 
  

   with 
  sharp, 
  revolving 
  grooves, 
  with 
  wider 
  interspaces, 
  being 
  about 
  twelve 
  on 
  

   the 
  body 
  whorl, 
  between 
  the 
  posterior 
  edge 
  of 
  the 
  aperture 
  and 
  the 
  carina. 
  

   The 
  notch 
  is 
  deep, 
  and 
  about 
  one-third 
  of 
  the 
  way 
  from 
  the 
  carina 
  to 
  the 
  suture. 
  

   Aperture 
  and 
  canal 
  long 
  and 
  narrow 
  ; 
  outer 
  lips, 
  before 
  the 
  carina, 
  effuse. 
  Nu- 
  

   cleus, 
  white. 
  Lon. 
  3.0 
  in. 
  ; 
  lat. 
  1.0 
  in. 
  ; 
  defl. 
  42°. 
  

  

  Habitat 
  : 
  Nateekin 
  Bay, 
  Captain's 
  Bay, 
  Unalashka 
  ; 
  one 
  specimen, 
  dead 
  on 
  

   beach. 
  

  

  This 
  species 
  was 
  at 
  first 
  supposed 
  by 
  me 
  to 
  be 
  the 
  adult 
  form 
  of 
  Drillia 
  Ken- 
  

   nicottii, 
  Dall, 
  but 
  on 
  comparison, 
  I 
  find 
  them 
  distinct, 
  as 
  the 
  latter 
  has 
  nearly 
  

   as 
  many 
  whorls 
  in 
  less 
  than 
  a 
  third 
  of 
  the 
  length, 
  and 
  the 
  carina 
  is 
  duplicated 
  

  

  