The carcinological collections of the Leyden Museum consist, besides of the European types, chiefly of forms from the East Indies and from the Japanese seas, the former being collected by the various travellers of our establishment, the latter being the types of the celebrated work of Mr. de Haan. We cannot therefore be too grateful to have found in Mr. J. A. Kruyt, Dutch Consul at Djeddah, Arabia, a man, who purposes to collect the Fauna of the Red Sea for the Museum. He already has made an interesting beginning, by presenting to us a remarkable collection of fishes aud invertebrate animals; it is of the carcinological part of the latter that I may be allowed to say a few words.