﻿AST. 
  17 
  NEW 
  LARVAL, 
  NEMATODES 
  SCHWARTZ 
  3 
  

  

  An 
  examination 
  of 
  Doctor 
  Cobb's 
  specimen 
  showed 
  it 
  to 
  be 
  an 
  

   immature 
  Porroeaecum 
  considerably 
  smaller 
  than 
  Porrocaecwm 
  

   encapsulatum, 
  the 
  mouth 
  structures 
  being, 
  however, 
  somewhat 
  more 
  

   developed 
  than 
  those 
  in 
  the 
  latter 
  species. 
  The 
  larval 
  nematode 
  

   from 
  the 
  mole 
  (Scalopus 
  aquations) 
  is 
  quite 
  distinct 
  from 
  the 
  form 
  

   found 
  in 
  the 
  shrew 
  (Blarina 
  hrevicauda) 
  and 
  is 
  described 
  as 
  a 
  new 
  

   species, 
  the 
  name 
  Porroeaecum 
  americanum 
  being 
  proposed 
  for 
  it. 
  

  

  PORROCAECUM 
  AMERICANUM, 
  new 
  species 
  

  

  The 
  worm 
  in 
  its 
  preserved 
  state 
  has 
  been 
  removed 
  from 
  its 
  cyst, 
  

   and 
  is 
  coiled 
  in 
  a 
  loose 
  spiral, 
  having 
  the 
  shape 
  of 
  the 
  figure 
  6 
  

   (fig. 
  3). 
  Doctor 
  Chapin 
  states 
  that 
  the 
  worm 
  in 
  its 
  encysted 
  con- 
  

   dition 
  was 
  tightly 
  coiled, 
  completely 
  filling 
  its 
  capsule. 
  The 
  speci- 
  

   men 
  is 
  7.9 
  mm. 
  long 
  and 
  225|>. 
  wide 
  in 
  the 
  middle 
  of 
  the 
  body. 
  The 
  

   cuticle 
  is 
  cross 
  striated 
  throughout 
  the 
  entire 
  length 
  of 
  the 
  specimen, 
  

   the 
  striations 
  in 
  the 
  middle 
  of 
  the 
  body 
  being 
  approximately 
  15pi 
  

   apart, 
  the 
  distance 
  between 
  the 
  striations 
  diminishing 
  as 
  the 
  two 
  

   extremities 
  are 
  approached. 
  The 
  mouth 
  structures 
  are 
  more 
  

   developed 
  than 
  those 
  of 
  Porroeaecum 
  encapsulatum, 
  the 
  three 
  

   lips 
  (fig. 
  2) 
  appearing 
  as 
  distinct 
  and 
  well-defined 
  structures, 
  

   the 
  dorsal 
  lip 
  being 
  larger 
  than 
  the 
  two 
  lateral 
  lips. 
  In 
  

   lateral 
  view, 
  cuticular 
  prominences, 
  such 
  as 
  those 
  in 
  Porroeaecum 
  

   e7icapsulatwn, 
  are 
  not 
  distinguishable. 
  The 
  esophagus 
  (fig. 
  4) 
  con- 
  

   sists 
  of 
  two 
  parts, 
  namely, 
  the 
  esophagus 
  proper 
  and 
  a 
  ventriculus. 
  

   The 
  former 
  is 
  about 
  690;j. 
  long 
  and 
  the 
  ventriculus 
  which 
  is 
  oblong 
  

   in 
  shape 
  is 
  133[x 
  long 
  by 
  about 
  SOjjl 
  in 
  mamimum 
  width. 
  The 
  nerve 
  

   ring 
  is 
  located 
  at 
  a 
  distance 
  of 
  178[x 
  from 
  the 
  anterior 
  extremity. 
  

   The 
  intestinal 
  caecum 
  (fig. 
  4) 
  is 
  440[x 
  long 
  and 
  lies 
  alongside 
  the 
  

   esophagus. 
  The 
  intestine 
  whose 
  diameter 
  is 
  more 
  or 
  less 
  uniform, 
  

   measuring 
  about 
  80\). 
  in 
  the 
  middle 
  of 
  the 
  body, 
  terminates 
  at 
  a 
  dis- 
  

   tance 
  of 
  107[a 
  from 
  the 
  posterior 
  extremity 
  (fig. 
  1). 
  The 
  tip 
  of 
  the 
  

   tail 
  (fig. 
  1) 
  is 
  apparently 
  broken 
  off 
  as 
  the 
  posterior 
  extremity 
  of 
  

   the 
  specimen 
  has 
  a 
  truncate 
  appearance 
  that 
  suggests 
  an 
  artifact. 
  

   No 
  evidence 
  of 
  a 
  genital 
  opening 
  or 
  of 
  gonads 
  could 
  be 
  found 
  in 
  

   this 
  specimen. 
  

  

  Hosts. 
  — 
  Scalopus 
  aquations. 
  

  

  Location. 
  — 
  Under 
  the 
  skin. 
  

  

  Locality. 
  — 
  Falls 
  Church, 
  Virginia. 
  

  

  Type 
  specimen. 
  — 
  United 
  States 
  National 
  Museum, 
  Helmintho- 
  

   logical 
  Collections 
  No. 
  26060. 
  

  

  EARLIER 
  REPORTS 
  OF 
  ENCYSTED 
  NEMATODES 
  IN 
  INSECTIVORA 
  

  

  The 
  first 
  record 
  of 
  the 
  occurrence 
  of 
  encysted 
  nematodes 
  in 
  Insec- 
  

   tivora 
  was 
  published 
  by 
  Goeze 
  (1782), 
  who 
  found 
  some 
  spirally 
  

   coiled 
  worms 
  inclosed 
  in 
  cysts 
  and 
  lodged 
  in 
  the 
  peritoneal 
  cavity 
  of 
  

  

  