ORUSTACKA — WIlITKI.KGnE. 155 



however, very distiiu't, ciicli tiilH-i-clc l)('iiii( suiinoiintcd l)y 

 numerous sinall i,^i;iiiules, wliicli occur in groups of two and iln'ee; 

 a bi'uadLsh band of siniilar granules extends from the tul)ercl(^s to 

 the intestinal region. 



In the largest female example the carapace measures 78 by 

 170 mm. ; the right chelipede is 185 mm. in length. The median 

 frontal teeth are minute and unequal ; the larger one measures 

 0"7 mm. The rounded granules on the transverse lines are about 

 0*6 mm. in diameter, and the same or less in distance apart ; on 

 the central regions they are slightly larger and crowded, but 

 rarely in contact at the base. The cardiac region has two sub- 

 median granulose elevations, but they are not higher than other 

 regional prominences. 



In another female example the carapace measures 63 by 1 40 mm. 

 and the right chelipede is about 145 mm. in length. The inter- 

 stices between the numerous bead-like granules are closely invested 

 with plumose hairs, about 0"5 mm. in length ; the branches are 

 confined to the vxpper third, and the acute apical portion of each 

 hair is unbranched. The frontal teeth are small, under 1 mm. in 

 length. The cardiac and gasti'ic tubei'cles are low, broad and 

 studded with moderately large granules, a few of which are in 

 contact at the base. There appear to be three characters which 

 are fairly constant and sexual. In the male the chelipedes are 

 greatly elongated ; the granules on the carapace are few, small, 

 distant and tend to become spiniform, and the antero-lateral teeth 

 are broader and less acute than in the female. In the latter the 

 chelipedes are short ; the granules are numerous, large, bead-like 

 and rarely more than their own diameter apart, at least on the 

 transverse lines and the regional elevations. 



The median frontal teeth vary so much that little reliance can 

 be placed on them as a character ; in fact, they are frequently 

 absent altogether. Since the ''Thetis" examples were examined I 

 have seen some hundreds of specimens exhibited for sale in 

 Sydney, and always made a point of inspecting as many as 

 possible, with a view of determining the amount of variation in 

 the frontal teeth. I have examined many specimens in which the 

 teeth were wanting, and others in which they were represented 

 by mere points or granules ; in some cases only one tooth is 

 developed, the other being absent, and the individual figured on 

 Plate X. in the Fauna Japonica presents the same feature — the 

 right submedian tooth is wanting. 



The middle lobe of the upper orbital border has a compressed 

 tooth at its outer angle, which is often acute, but this is not 

 constant ; it is frequently rounded like that on the inner angle. 



