1. His observations on catfish, electric fish and angler-fish are detailed, as is his writing on cephalopods, namely, Octopus, Sepia and the paper nautilus. 正像他有关头足类动物也就是章鱼、乌贼和鹦鹉螺的著述一样，他对鲶鱼、电鱼和琵琶鱼的观察是很详细的。