Programmatically read all rows containing a word from a table on a web page

In the table on http://ift.tt/2gmcW33, I want to read the second column from all rows that have "C. elegans" or "H. sapiens" in the first column. I need to do that programmatically because I have 654 web pages that have a similar table with different information. Can someone give an example code that achieves this? I would prefer an example in R, if possible.