[Taxacom] help with Gastropoda reference

[Rodrigo Salvador]

Dear all,

I'm having a hard time finding the original reference for the
gastropod *Theodoxus
macri* (Sowerby, 1849).
Could anyone point me towards it?

Kind regards,
Rodrigo Salvador.

-- 
*M**Sc Rodrigo Brincalepe Salvador*
Staatliches Museum für Naturkunde Stuttgart. Stuttgart, Germany.
*Website:* https://rodrigobsalvador.wordpress.com/
*Curriculum:* http://lattes.cnpq.br/5151462660557382
*ResearchGate:*
https://www.researchgate.net/profile/Rodrigo_Salvador/?ev=hdr_xprf
*Editor of Strombus*, journal of the Conchologists of Brazil:
http://www.conchasbrasil.org.br/strombus/default.asp