236 



" ENDEAVOUR " SCIENTIFIC RESULTS. 



Tentacles variable, usually differing considerably from one 

 another in longitude, the left (in the specimens at hand) almost 

 invariably the longer, attaining a length from 70-98% that 

 of the mantle ; more oi' less compressed, particularly near the 

 base, and strongly keeled along their outer angles for their 

 entire length, the keel reacliing its maximum development on 

 the distal half of the club ; oral face of stalk not flattened at 

 base, though at a point about half Avay from the base to where 

 the suckers begin there commence a pair of slight lateral 

 thickenings which soon pass into the trabeculate lateral mem- 

 branes of the sucker-bearing area ; sucker-bearing portion of 

 tentacle about 60-70% of the entire length, about two-thirds 

 of this comprised by the club proper. Tentacle club with 

 suckers borne in four rows ; all the suckers of both marginal 

 rows small ; about eight pairs of the central suckers much 

 larger than the others, the 4th-5th pairs of these largest of 

 all ; after the 8th pair, suckers of the two mechan series 

 suddenly reduced so that thenceforth those of the ventro- 

 marginal series are largest ; all suckers on distal one-third or 

 so of the club relatively small, graduallj'' diminishing in size 

 dorsaily and distally, finally terminating in an oval group of 

 verj' minute, crowded suckers just proximal to the smaJi 

 apical cap of the club ; suckers of two median rows not 

 changing in size with such abruptness proximally, but the 

 eight large pairs succeeded by three pairs of evenly diminishing 

 suckers, which, with the marginal series pass imperceptibly 

 into two rows of very small suckers (some 4-6 pairs) on the 

 carpus (PI. Ixvi., fig. 2) ; carpal suckers evincing a tendency 

 to occur in alternating, but only slightly cUfferentiated, sizes, 



T'ie. 24. — Onmiastrejihps ha- 

 waiiensif! J [243], horny ring 

 of sessile arm sucker of type, 

 viewed obliquely from upper 

 side ; camera drawing from a 

 mount in balsam. 



Fig. 2~j. — Oinmastrequhes hcnvaii- 

 ensis J [243], horm' ring from large 

 tentacular sucker of tjqje ; camera 

 drawing from a mount in balsam. 



