Size 23µ base width, 41µ long, total volume 5678.17. Temp. range 24.5 to 28.17, salinity range 12.14 to 15.65. Collected July to Sept. from all Rhode River stations and in the Chesapeake Bay. This species is one of the most common varieties and is cosmopolitan in cold temperate to warm tropical water, although we rarely see it past September in this part of the bay.