Miscellaneous. 345 here so reduced in size as to be quite invisible from above, and only demonstrable with difficulty from below, whence it appears in ordi-nary positions under the microscope as a convex ovuidal or heart-shaped plate ; it, moreover, looks downwards and slightly backwards, instead of upwards and backwards or directly backwards, as it usually does. The legs are long, slender, simple, equal in length, rather more than twice as long as the body (including the rostrum), and are com-posed of eight joints, terminated by a weak slightly curved claw. Their three basal joints are as broad as long, equal, and almost glo-bular ; the fourth is club-shaped at the distal end ; the fifth is all but as long as the fourth, and, with the remaining joints, perfectly filiform ; the sixth is shorter and about twice the length of the two last together ; these are subequal. millims. Length of the body (including the rostrum) 13 ,, „ legs 26 „ „ second pair of cephalic appendages 10 „ third „ „ „ ^ 12 From the linear form of the body and the slenderness of the legs I conclude that rhy specimen is a male — a conclusion by no means invalidated by the presence of the third pair of cephalic aj)pendages, which, being a,pparently invariably developed in both sexes through-out several genera {Nymplion, &c.), consequently possesses no value in the determination of questions of sex. Hah. Dredged by the writer at Port Blair, Andaman Islands, in 25 fathoms of water, at which depth the bottom was clothed with a dense tangle of delicate filamentous algae so closely resembling the animal in point of colour and form that the latter was with difficulty distinguishable. In conclusion, I dedicate the first species of Pycnogonida hitherto discovered in these seas to the memory of the illustrious Danish naturalist whose name is so indissolubly connected with the history both of the Pycnogonida and of the lower Crustacea. — Jo^irnal of the Asiatic Society of Bengal, vol. xlii. part 2 (1873). On the Development of Distomum nodulosum. By 0. von Linstow. The author has ascertained that Distomum nodulosum is not pro-duced from the Cercaria Planorbis carinati as supposed by De Filippi, but from another form which was not previously known. To follow the migrations of this Avorm the author put individuals full of ova into a vase containing freshwater mollusca (Lymneus, Pahulina, Planorbis, Valvata, etc.). The Distoma were soon de-composed and their ova were set free. The first embryos were hatched in two or three days ; they swam about rapidly by means of their vibratile covering. It was in the alimentary canal of certain ChDetopod Annelids by which they had been swallowed that M. von Linstow was best able to follow the first transformations of these larva? ; they had lost their cilia, and there was clearly to be
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