NOTES ON A GIGANTIC CEPHALOPOD. 45 



three other pairs. Seven membranes united these tnl^ercles with the 

 base of the sessile arms exactly in the manner described by Veerill* 

 for Sthenoteutlm jyteropus. He says : * * * externally it (the 

 bnccal membrane) is connected to the arm by seven membranous bri- 

 dles, corresponding to the seven angles ; of these the dorsal one forks, 

 one branch going to the inner margin of each dorsal arm ; the upper 

 lateral ones join the margiiial membrane of the upper angle of the 

 upper lateral arms ; the lower lateral ones join the lower marginal 

 membrane of the third pair of arms ; the ventral ones join the marginal 

 membrane outside of the sucker-bearing face of the ventral arms." 



The Beaks : In the UpiJcr Mandible (Fig. 6a), the rostrum 

 was strong, convex, acute, and was curved considerably forward, with 

 concave cutting edges, with 710 notch at their Jmse. The surface 

 l^etween the two cutting edges was nearly flat, with a broad low median 

 ridge. The angle which the cutting edges made with each other at the 

 tip of the rostrum was abont 4r/. The anterior edge of the ala was 

 irregular with three low teeth. The paJatine lamina was broad and 

 thin. The colour of the rosti-um was dark brown, changing to black 

 towards the tip. The ala and rostrum were sharply marked off from 

 each other. by colour, the black colour of tip running down on each side 

 along nearly two-thirds of the line b-g (Fig. 6a). "J^he palatine lamina 

 was darlc brown in the median part, became gradually lighter towards 

 the sides until it was almost colourless. The measurements (taken 

 after being in alcohol a few days) were as follows (letters refer to simi- 

 larly marked points on Fig. e)a):~a — d^-SH mm., a — b = ll mm., a-e 

 = r)i mm., b-g = 12 mm.,/-c = 10 mw., Ji-i = p] mm., breadth at b = 

 <^.5 mm., breadth at cj — ir) mm. 



In the Lower Mandible (Fig. 6 b), the rostrum was stouter and less 

 curved ; its tip was acute, with a distinct notch just below the tip. 

 The cutting edges were nearly straight, with a very small notch at 

 their base. A ridge ran from the tip somewhat ventral to the cutting 

 edge, and limited a more flattened area having fainter ridges running in 



* loc. cit. p. 228. 



