INTRODUCTION
THE present work is the continuation of a series of studies (Al-Hussaini, 1945-7) attempting to correlate the structure of the alimentary canal with the feeding habits of teleosts. These earlier studies were based on distantly related species and thus the differences observed and described might well be due to congenital factors rather than to purely adaptive causes—of this no certain answer can yet be given. The present study is an attempt to exclude congenital factors as nearly as possible by choosing three closely allied species
[Quarterly Journal Microscopical Science, Vol. 90, part 2, June 1949]
2421.10 T