88 



I. I.JIMA AND S. IKKDA. 



that the above-mentioned compression, to which the animal was 

 subjected, must have unnaturally augmented the thickness of the layer 

 in the marginal region at the expense of that both above and below. 

 The same layer, as already indicated, extended itself over the arms and 

 the webs in such a way that the external surface of the umbrella pre- 

 sented no elevations corresponding to the course of the arms below. At 

 about the middle of the umbrella the layer was nearly 5 mm. thick over 

 the arms, while the web measured as much as 12 mm. in thickness. It 

 somewhat decreased in thickness towards the umbrella edge, which, 

 nevertheless, presented a swollen appearance. On side-views of the arms 

 it could plainly be made out that the inner surface of these had the same 

 gelatinous layer as that on the outer and that the suckers lay buried 

 in it up to their external opening. The external surface of the layer, 

 and therefore that of the animal, was quite smooth and slippery. 



Numerous small chromatnphores of madder-brown to yellowish 

 colors besprinkled the surface of the otherwise perfectly colorless and 

 clear gelatinous envelope. In greater abundance and larger sizes were 

 they found also in the deepest stratum of the layer, closely over the 

 muscular tunic of the mantle, along the surface of the brachial muscles 

 and on the eye-bulbs. According to the collector's statement, the 

 animal, when in full vigor of life, should have displayed a vivid and 

 beautiful change of color, now " intensely red " and then " nearly 

 colorless." 



Through the gelatinous envelope were indistinctly discernible the 

 deeper outlines of the body, the head and the siphon. The body and the 

 head, in this sense, together formed a roundish or ovoid mass, nearly 

 transparent in the posterior portion but more opaque towards the head 

 and the siphon. Between the head and the crown of arms there was a 

 distinct neck-like constriction, which was not in the least shared by the 

 outer gelatinous envelope. The arm-bases were rather opaque ; 

 however, there could be seen through them the faintly colored buccal 

 mass, marking the fundus of the umbrella. For the rest the arms were 

 sufficiently transparent as to show beautifully their ganglionic chain. 



