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May 25th; Conspectus Crustaceorum, &c. Conspectus of the Crustacea of the Exploring Expedition under Capt. Wilkes, USN, including the Crustacea Cancroidea Corystoidea; A Revision of the North American Astaci, with Observations on Their Habits and Geographical Distribution; Synopsis of the Anthicites of the United States; Description of a New Species of Ectopistes
Ruebenheber, dessen meisselartiges, vorn keilfoermig zugespitztes Schar in einen nach hinten ansteigenden und nach der Ablegeseite abgekruemmten Aushebearm uebergeht