1921
Volume 8, Issue 4
  • ISSN: 0002-9637
  • E-ISSN: 1476-1645
USD

Abstract

Summary

This paper is based on the comparative study of 15,516 specimens of from 36 localities and 12,776 of from 31 localities. A description of the renal region of both species is given, and it is concluded that they are distinguishable by the presence (in ) or absence (in ) of a ridge along the middle line of the membrane which covers ventrally the renal tube.

The ridge makes its appearance in specimens of about 10 mm in shell diameter and then gradually develops as the animal grows. It rises from a pigmented stripe which represents its forerunner in the small specimens under 10 mm in diameter.

The renal ridge is defined, both anatomically and histologically, and is shown to be a reliable diagnostic character of subject to age variation.

The unridged renal membrane of is also defined, with especial reference to its variation and to some unusual characteristics that may lead the taxonomist to confuse and .

Loading

Article metrics loading...

/content/journals/10.4269/ajtmh.1959.8.456
1959-07-01
2017-11-21
Loading full text...

Full text loading...

http://instance.metastore.ingenta.com/content/journals/10.4269/ajtmh.1959.8.456
Loading

Most Cited This Month

This is a required field
Please enter a valid email address
Approval was a Success
Invalid data
An Error Occurred
Approval was partially successful, following selected items could not be processed due to error