Thank you Roger and Shanew147 for your replies. Roger, those links were very helpful, and I appreciate you going out of your way to provide them.
Shanew147, I also did the OSI Map comparisons, coupled with research in the NLI online parish records info, and came up with the same conclusion that you did. Thus far I have found that the St. Nicholas, St. Nicholas South and West, St. Nicholas North, and North and East, referred to the same parish, which I believe refers to the former the St. Nicholas Pro-cathedral on the corner of Middle Street and Abbeygate Street in Galway City. See the NLI Catholic Parish Map at: http://registers.nli.ie/parishes/0640
On the map to the right of the page click on the cross icon for for St. Nicholas South and West to see the variant names of the parish. The map also shows another cross icon just to the north of St. Nicholas South and West. This icon is for St. Nicholas East. If you click on St. Nicholas East you'll see the variant name for St. Nicholas East was Bohermore. I am wondering if this could refer to St. Patrick's Chapel on Forster Street. The OSI map from the 1829-1841 time period shows St. Patrick's, and lists it as the R.C. Chapel. Information at the NLI site suggests that the St. Nicholas East parish registers are separate from the St. Nicholas South and West parish registers. See: http://tinyurl.com/jaeyeqr
Once again Roger and Shanew147, thank you both for your input. It is greatly appreciated.
Dave