CEPHALOPODA. — BERRY. 285 



Eyes niodei'ately large, appearing as aiitero -lateral swellings 

 on the central hiimp. Funnel posterior in position and 

 direction ; apparently minute as seen from the exterior, but 

 in reality long and narrow, only the apical portion protruding ; 

 interior si"milarly narrow, its walls 

 lined by a wrinkled epithelium. 



Funnel organ (Fig. 64) very 

 simple, comprising merely a pair 

 of small, well separated, oblique, 

 oval pads situated well back on 

 the clorso - lateral walls of the 

 chamber. 



A rms moderate , practically 

 equal in length ; little or not at 

 all evident outwardly, and within 

 only as sucker-bearing thickenings ^ig- ^^"t.—Opisthoteuthis 

 in the umbrella; inconsistency Pj«<« [468], funnel laid open 

 , „ ' ^ , , '^ along medio-ventral line to 



not much hrnier than the expose funnel organ. 

 interbrachial membrane itself. 

 Suckers uniserial, relatively firm and 

 hard, moderate in size, the 5th to 7th 



from the mouth usually the largest, thence rapidly diminishing 

 in size proximally and more gradually distally to the extremity 

 of the arm ; first three at base very small in relation to those 

 succeeding them ; flanked on each side by an equal number 

 of alternating cirri as usual in the genus, both suckers and 

 cirri apparently more or less completely retractile within a 

 circular fold of the integument sometimes forming a sort of 

 pocket-like sheath ; the pockets for receiving the cirri, some- 

 times, though not always, visible from the exterior through 

 the integument, extending transversely or somewhat obliquely 

 inward almost to the line of suckers (PI. Ixxxii., fig. 6) ; total 

 number of suckers to be readily counted on each arm of a 

 large specimen, 80-85. Umbrella (PI. Ixxxiv.) exceedingly 

 ample ; its greatest extension usually in front where it webs 

 the arms (in the type) to within about 2 cm. of their tips ; 

 dorsal arms more or less curved, the concavities of the curves 

 facing so that the margin of the web between them is relatively 

 short ; remaining arms usually evincing a tendency to curve 

 forward, the ventral arms therefore just the reverse of the 

 dorsal in this particular, and with the web connecting them 

 correspondingly wide . * 



* The result of all this is that the umbrella, in fact, the entire disk, 

 shows a much stronger bilateral symmetry than would otherwise be the 

 case. A thoroughly similar condition, with only minor points of differ- 



