The gene currently identified in FlyBase as  snmRNA:342  is RNAse MRP RNA; it is described in:
Piccinelli P, Rosenblad MA, Samuelsson T. (2005) Identification and analysis of ribonuclease P and MRP RNA in a broad range of eukaryotes. Nucleic Acids Res. 33(14):4485-95
The full sequence is:
     >D.melanogaster_RNAse_MRP_RNA
       GCCGGTTTGAGTCTTCCATGCTTGTCTCTCGGGGCCACAAAACGAGTTCC
       TGGTAACTCAACTGATAATGCCCTGGGCGAAAGTCCCCGGGCCTAGGATA
       GAAAGTATCAAGGTGTAAAAAGTGTGCACAAAACACCCACCACCCCTGTG
       GTGGGTGGTGCATTCGCCTATATTCTGCGGAATTTCGCCTGGCGTATGGA
       TGAAGAGGATTTTATCCGAATCCTTACGCGCCAGGTTGTCTGCGGAAATC
       TGCCAGAGTAATCTTAGATATGGACGAGTTGGTAGGACTCGGCGGGTGGT
       GTTCACACACTTTCTCGTCTGAGAAACCGCCTACACAGAATGGGGCTTAC
       ATTGGGAAACTCGGACGGCGCACTCCCTTTTTT 
An appropriate symbol is " RNaseMRP:RNA ".