Dear Sri Joshi,
As a thumb rule, you can take the occurrence of the La-kAra as a
specialty of Rgveda recitation, which is not present elsewhere in
Sanskrit. In the Rgveda saura sUkta, for example, you will hear two
consecutive verses: the first begins, "baN mahAn asi sUrya baLAditya
mahAn asi" and the second begins, "baT sUrya SravasA mahAn asi ..."
The basic pada used in both verses is baT, which changes to baN when
followed by the word mahAn, to baL when followed by Aditya, and
remains unchanged when followed by sUrya.
You can easily deduce a rule about external sandhi here. When word
ending -T is followed by a word-initial vowel, the sound -L appears
(instead of becoming -D as in classical Sanskrit). This explains your
examples, ShaLurvI and ekarALiti - your sandhi vigraha is correct.
There are other nuances governing internal sandhi in words like ILe
and mILhuShe, but again, as a general thumb rule, -L and -Lh in Rgveda
are equivalent to retroflex -D and -Dh respectively. You may have
noticed that yajurvedins recite -D and -Dh in the same contexts,
e.g. ... ShaDurvIr uruNaH kR^iNota ..., mIDhushTama Sivatama... etc.
An aside - The word mahAn in the two Rgveda verses quoted above is
followed by the word asi, beginning with a vowel. It is pronounced not
with the dantya na-kAra, but is an anusvAra, sounding more or less
like a kaNThya nasal and written with a candrabindu in printed
editions. In the context of yajurveda recitation, the same sound would
become the heavily glottalized anusvAra, sounding like there is an
explicit -g- sound in there, e.g. mahA(g)M indro vajrabAhuH ..., ...
bAnavA(g)M uta, etc. This pronunciation complexity of the nasals has
also been lost in classical Sanskrit.
There is really no logical answer for the question why. They just are,
as characteristics of Rgveda and yajurveda chanting. What is
fascinating is how these sounds have been retained in the context of
veda recitation, even after disappearing from classical Sanskrit.
Best Regards,
Vidyasankar
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