. Journal of entomology and zoology. e a littlesmaller than the others. Five ganglia are described by Dohrn 81 and others, due nodoubt to a more definite fusion of certain centers. In theembryo of Palene, as described by Morgan 91, there areganglia corresponding to each of the pairs of appendages,those of the seventh or last ]>air and the abdominal gangliaappear last in development. Merton 07 describes six pairs of ganglia in Nymphonparasiticum, the second pair, or the first subesophageal center,is clearly shown to be composed of two parts on each side, butthe last pair represents the abdom
. Journal of entomology and zoology. e a littlesmaller than the others. Five ganglia are described by Dohrn 81 and others, due nodoubt to a more definite fusion of certain centers. In theembryo of Palene, as described by Morgan 91, there areganglia corresponding to each of the pairs of appendages,those of the seventh or last ]>air and the abdominal gangliaappear last in development. Merton 07 describes six pairs of ganglia in Nymphonparasiticum, the second pair, or the first subesophageal center,is clearly shown to be composed of two parts on each side, butthe last pair represents the abdominal ganglia, if one mayjudge from the figure given. In L. marginatus the first three cephalic ganglia are quiteclose to each other and partly fused, as the figure shows. Thelast three ganglia are more widely separated. From one totwo abdominal ganglia are described in other pycnogonids. Inthis species the abdomen is very small and no ganglia werefound. Probably all of the abdominal elements are fused withthe last thoracic Diagram of the position of the nervous system of Lecythorhynchus marginatns,compiled from longitudinal and cross sections. Slightly diagramatic. , 2 and 3, first, second and third appendages. 136 JOURNAL OF ENTOMOLOGY AND ZOOLOGY The supraesophageal ganglion is of rather small size. Itsends small nerves to the eyes, to the first pair of appendagesor chelifori and a mid-ventral branch to the proboscis. The subesophageal ganglion supplies the other cejihalieappendages. There are three branches from each side of thisganglion, one pair is for the proboscis, one for the palpi, orsecond appendages, and one pair for the ovigers, or thirdappendages. The second and third appendages are spoken ofby some authors as being supplied by distinct ganglia. In thisspecies there is no division into two centers. The chief branches of all of the other ganglia are to thefour larger appendages, or walking legs. IMPORTANT LITERATURE Adlcrz, G. 1888 Bidrag till Pantop
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