The legs, usually, take the colour of the cephalothorax, and are, hence, generally lighter than the abdomen, but to this there are exceptions. Where the individual legs differ in colour, the two first pairs are the darkest, and the dark hue corresponds in tint with the dark markings on the cephalothorax. The joints of the legs are in many species emphasized with dark colour, which is often repeated in bands along the limb. The most remarkable point is, however, the pattern on the abdomen, which, though varied in all possible ways, always preserves a general character, so that we might speak with propriety of a spider-back pattern. This pattern is fairly well illustrated in the genus _Lycosa_, but is seen to perfection, and in its simplest form in _Segestria senoculata_, Plate VIII., Fig. 1, and in _Sparassus smaragdulus_, Plate VIII., Fig. 2. This peculiar pattern is so like the dorsal-vessel that lies just beneath, that it is difficult to avoid the conclusion that we have here an actual case of the influence of internal organs on the integument, and this we believe to be the case. No matter how curious the abdominal markings may seem to be, they never so far depart from this fundamental pattern as to appear independent of it. Thus, in the genus _Lycosa_, which is by no means the best for the purpose, but is chosen as illustrating Gegenbaur's diagram, Pl. VIII., we have the dorsal-vessel well marked in _L. piscatoria_, Plate VIII., Fig. 3, from which may be developed the other forms. In _L. andrenivora_, Plate VIII., Fig. 4, the male shows the vessel-mark attenuated posteriorly; and in the female, Fig. 5, the hinder part has become broken up into detached marks, still preserving the original shape, while the upper part remains practically unchanged. In _L. allodroma_ the disintegration of the mark has further advanced, for in the male, Fig. 6, the upper portion has lost something of its shape, and the lower part is a series of isolated segments. This process is carried still further in the female, Fig. 8, where the upper portion is simplified, and the lower almost gone. In _L. campestris_, Fig. 10, the mark is reduced to a stripe, corresponding with the upper part of the vessel-mark only: and, lastly, in the male _L. agretyca_, Fig. 7, this upper part is represented by two spots, though even here traces of the original form can be seen. A simplification of marking of another sort is seen in _L. rapax_, Fig. 13, where the chamber-markings are almost obliterated, and merely an irregular stripe left. The stages by which this modification is arrived at are too obvious to need illustration.