40 MARINE BIOLOGY OF THE SUDANESE RED SEA, 
The Head presents no distinctive characters. 
The Arms are subequal, the order of length being 4, 3, 2,1 on the right 
side and 4, 2,3, 1 on the left; they taper evenly towards the extremities 
those of the fourth pair are sharply keeled externally. The suckers are in 
four rows, except on the dorsal pair, where they appear to be in two rows 
owing to the lateral compression of the arms; they are of moderate size and 
. 
gl 
Fig. 5. 
Front view of the tentacular club : Back view ot he enien club : 
x 3. x 3. 
Portion of the horny ring and papillary 
One of the large tentacular suckers : area, from the same sucker as fig. 6: 
x 50. x 172. 
marked with irregular meridional grooves. The horny ring (fig. 2) has about 
fifteen teeth in the distal semi-circumference, most of these are slender and 
bluntly pointed, but some are broad, and notched at the extremity as though 
made up of two or three teeth fused together; there is a papillary area of the 
usual kind round the horny ring. What I take to bea form of hectocoty- 
lisation is seen on the fourth left arm (fig. 3) ; about one-fourth up the arm 
the two, dorsal rows of suckers become much smaller and continue so till 
rather more than halfway up ;, no arrangement of grooves and ridges was 
seen, Perhaps the hectocotylisation was only partially developed; the 
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