320 REPORT OF COMMISSIONER OF FISH AND FISHERIES. [110] 



transverse breadth, across alee, 32 mm ; transverse breadth, across anterior 

 edges of alae, at teeth, ll mm . 



These jaws agree pretty nearly in form and size with those of 0, 

 pteropus, as figured by Steenstrup, but the latter have a deeper notch in 

 the upper mandible, with a more evident lobe beyond it, while the lower 

 mandible has a broader and less triangular notch. 



The buccal membrane is large, thin, prolonged into seven acute angles 

 or lobes, of which the upper is in the median plane, opposite the inter- 

 val between the dorsal arms; the six others a e opposite the three other 

 pairs of sessile arms. The inner surface of rhis membrane is covered, 

 near the periphery, with small rounded papillae ; externally it is con- 

 nected to the arm by seven membranous bridles, 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 mar- 

 ginal 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.. In front of the bases of each of the 

 dorsal and tentacular arms there is a large opening to the space beneath 

 this membrane. 



The beak is closely surrounded by a thick, prominent, lobed, and 

 wrinkled fleshy collar, with papillae on its inner surface; outside of this 

 there is a smooth, sharp-edged, erect collar, less prominent than the 

 inner one. 



The odontophore is similar to that of Ommastrephes ; it is sharply bent 

 upon itself anteriorly, with the ventral end less than half as long as the 

 dorsal ; the dentigerous zone is yellowish brown in color, and bordered 

 laterally by a thin ridge formed by a row of small plates ; the lateral 

 membrane is broad, thin, and pale yellow, running straight across, from, 

 the ventral end, at right angles to the dorsal portion, and then folding- 

 back upon itself joins the dorsal part of the odontophore farther back, 

 near its middle; beyond this point it is very narrow and rolled in. 

 Length of the dorsal portion, 19 mm ; of the ventral, 9 mm ; breadth of the 

 dentigerous zone, anteriorly, 5 mm ; breadth of marginal membrane, ante- 

 riorly, 7 mm . 



The median teeth (Plate XVII, fig. 4, a) are broad, with three stout 

 points, the middle one nearly twice as long as the lateral ; the inner 

 lateral teeth (&) are much longer, with one long stout point and a short 

 denticle on the outer side, below the middle ; the two outer rows (c, d) 

 have simple, long, and rather stout, curved teeth, those of the outermost 

 row a little longer and narrower than the others. The teeth differ de- 

 cidedly from those of 8. megaptera in the shortness of the lateral denticles 

 of the median and inner lateral teeth ; moreover, all the teeth are stouter 

 and less acute. 



The pen (Plate XVII, figs. 5, 5 a) resembles that of Ommastreplies ; it is 

 long, widest anteriorly, bordered by strong ribs, obtusely pointed at the. 



