Bekky. — Cephalopoda from, the Rermadec Islands. 



141 



these the central one is distinctly the largest, the anterior terminal one the 

 smallest. To the naked eye the central organ appears to be nearly circular 

 in outline, the organs on each side of it more oval, and the terminal organs 

 quite elongate, but when the entire series is removed and mounted in balsam 

 their outline as seen under a low-power lens is more as shown in the ac- 

 companying diagram (fig. 1). The large central organ is so conspicuous 

 that it is visible through the outer integument even in preserved speci- 

 mens. The funnel is short, compressed, and bluntly conical. Locking 

 cartilages simple, comprising a slightly curved cartilaginous groove with 

 raised margins on either side of the base of the funnel, and a very long 

 and narrow ridge on the inner surface of the mantle, the ridge being about 

 half again as long as the groove. 



Arms very unequal in length, their relative order 3, 2, 4, 1, or perhaps 

 3, 2 =4, 1. Dorsal pair notably the shortest and more slender than the 

 others ; not keeled except for a faint carination along their 

 distal portions ; each bears a single small heavily pigmented 

 photogenic organ in the tissues of the outer portion of the 

 arm, near the tip. Sjcond-arm pair similar > 



to the first, but larger and with a somewhat J\ ii 



better-developed keel distally ; each pos- 

 sesses a photogenic organ a little larger than 



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Fig. 3. 



Fig. 2.—Nematolampas regalis : Right third arm of type, showing terminal filament 

 and photogenic organs, the latter represented as small black dots. 



Fig. 3. Nematolampas regalis : Portions of terminal filament of right third arm of 



type, showing photogenic organs (the small dots in this drawing are 

 chromatophores). Greatly enlarged freehand sketch from mount in balsam. 



Fig. -i.—Nematolampas regalis : Portion of stalk of right tenacle of type, showing the 

 large distal photogenic organ. Optical section from mount in balsam. 



those of the dorsal arms, but otherwise similar. Third-arm pair stouter than 

 any of the others and much the longest, terminating distally in an exceedingly 

 slender beaded filament (fig. 2), which when straightened out is considerably 

 longer than the entire remaining portion of the animal and is devoid of 



