ACÏIN'OPODOUS HOLOTHURIOIDEA. 109 



like the eyo-spots of //. argus, but here the outer brown rim is 

 a well-defined line, instead of shading off gradually centripetally ; 

 moreover, there is no central dark spot. In the largar patches, 

 there may be a papilla in the centre of each component circle, but 

 in the very largest, it is not possible to observe the papillae. The 

 patches along the edges of the dorsum are more or less circular, 

 measuring 1 — 2 cm. in diameter, and on the whole form a row 

 on each side. In general, the dorsum looks like the map of an 

 archipelago consisting of numerous large and small islands of all 

 shapes, and well supports the name marmorata. 



On the ventrum the ground color is white. There is an ill- 

 defined longitudinal band of a dark sooty color occupying about 

 one-third of the ventrum. In this streak, surrounded by white 

 spaces, are yellow- ochre patches of the same type as on the dor- 

 sum but generally of only small sizes. Of these there are 

 roughly speaking two longitudinal rows, one on each side of the 

 median line. Outside of the sooty band, there is on each side 

 an irregular row of the same patches, closely bordering on the 

 darker dorsum. These lateral rows consist on the whole of larger 

 patches than those near the median line, most of them being 

 about 1 cm. across. The patches on the ventrum show no central 

 papilla. 



In alcohol, the colors are arranged as in the living specimen, 

 but the ground color of the dorsum has acquired a purplish tinge. 

 The ochre-yellow patches now appear dark-brown or mars-brown, 

 and those on the sides are more conspicuously visible than those 

 on the more dorsal parts, as the white of the ventrum seems to 

 extend around those patches and make them stand out distinctly. 

 In the macerated specimen (No. 1047) the colors are much faded, 

 and tlie irregular patches a})pear light on the general auburn 



