3^5 , I. IJIMA AND S. IKEDA. 



skin, the wrinkles abounding most near its margins where they 

 generally run, with interruptions, in circular curves. Many of these 

 were probably to be seen even in the living state when the arms were 

 at rest, certainly to disappear, however, under the tension caused by 

 certain movements of the latter. (3thers may be the result of contrac- 

 tion brought about by immersion in alcohol. Underlying the skin 

 there is a thick layer of very soft connective-tissue, that fills up the 

 webs and also covers the outer as[)ect of the arms ; so that, while it 

 gives such a tliickened or swollen appearance to the former, it conceals 

 the latter beneath it, making their course untracealjle on the outer 

 side of the umbrella. The same condition sliould als(3 obtain in 

 0. Agassi:ii. 



As already mentioned, the entire superior sin-face is gently 

 C(jnvex, but its central portion, i.e., the head and body proper, in our 

 alcoholic specimen must be described as being rather flattened, except 

 in the region of the eyes, where, it somewhat heaves u[) into r(3unded 

 prominences presenting the most pr(jjecting points of tlie upper 

 surface (tig. 1). Otherwise, the head is as hnv, 'nid •al)out as l;u-ge 

 and as broad, as the body. Ihe latter does not overhang in any 

 degree the branchial aperture, a condition suggesting that the 

 depression of the body in the present species is carried somewhat to 

 a greater extent than in 0. A(i(i>)si.:ii. 



The eyes, which should l:)e very large in ( K A(jassizii, are here of 

 moderate size, and are separated from each other by a wide interorbital 

 space. Their external op)enings are small semilunar slits, tlisposed 

 longitudinally and with mendjranous u[)per and thick lower lids. 

 The distance between the two o})enings exceeds twice tli( diameter of 

 the eye-bulb, but is about equal to their distance from the free edge of 

 the dorsal web. 



The fins are very small compared ^vith tinsse of O. A(jassizii. In 



