DESCKIPTION OF OPISTHOTEUTHIS DEPRESSA X. SP. 399 



size üikI tlic zone between the two rows of cirri lessen in breadth to- 

 wards the h;ise of tlie arms. The free ends are ratlier slender, are coni- 

 pressed, and more or less outwardl}" curled. lîy far the greater 

 extent, say about nine tenths of the entire lenoth of arms, is plainly 

 webbed, and such p(3rtions show a remarkal)le (iirxature on the same 

 ])lane, viz., both rioht and left arms are all moi-e or less curved dorsad, 

 so that while the two dorsal arms face each c^tlier with their r-oncü^itv, 

 the two ventral arms do so with their convexity so that their ends ww 

 turne<l laterad aw;iy from each other (lig'. o). Xone of the arms 

 shows any sign of hectocotylization. 



Consequent upon the horizontal carvature of the arms, the edge- 

 line of tlie dorsal web is the least extensive of all, since the two dorsal 

 arms approach each other towards their ends, ^[oreover, it is deeply 

 slackened in, o-iving' rise to a median angular notch, the two sides of 

 whicli are symmetrical. On the other hand, the ventral web has, as 

 is easily comprehensible, the most extensive edge-line, which is almost 

 straightly stretched. With respect to the lateral webs, their edge-lines 

 are all of about the same extent, always with this peculiarity, that 

 every one of them is oblicpiely indented, so as to form an open angle, 

 the a])ex of which lies at least four times more distant from the tip 

 of the next dorsal arm than from tliat of the next ventral. As the 

 result of this fact, a lateral web can not be divided by anv line into 

 two symmetrical parts and each lateral arm, as also the ventral arm, 

 has a greater stretch of narrowed web-continuation along the ^ entrai 

 than along the dorsal side near its end. There is then an appearance 

 as if the two ends of the free edge of a lateral web terminated at 

 unequal distances from the tips of the arms connected by it, as is 

 known to be the case in some Cepiialopod species. But such seems 

 not to be the real state in 0. depressa. We are rather inclined to 

 consider that the above described condition of lateral webs is merelv 



