TY - JOUR T1 - A Letter from Dr. Parsons, F. R. S. to Mr. Peter Collinson, F. R. S. concerning the Shells of Crabs JF - Philosophical Transactions (1683-1775) VL - 47 SP - 439 EP - 440 PY - 1753/01/01/ UR - http://dx.doi.org/10.1098/rstl.1751.0074 M3 - doi:10.1098/rstl.1751.0074 AU - Parsons, J. ER -