M. VIRIDIS. _M._ lævis membranaceus, cardine terminali.

M. RUBER. _M._ rugosus, valvulis obliquis, postice dilatatis, margine

antico apicem æquante.

The preceding mussel spoken of was not _viridis_, but _ungulatus_. The

reading was not "brevissimo, compresso," but "brevissime compresso."