566 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.45. 



Photogenic organs of the ventral aspect of the head and mantle 

 of two main types differing both in size and pigmentation; on the 

 lower surface of the mantle the larger organs are arranged in longi- 

 tudinal series, with the smaller organs irregularly scattered between 

 them. The ventral surface of the funnel shows two large triangular 

 groups of organs symmetrically disposed; four of these are of the 

 larger type but do not lie in a single transverse series. 



Type.—Csit. No. 214387, U.S.N.M. [S. S. B. 275]. From Albatross 

 station 4087, northeast entrance to Pailolo Channel. 



The smgle specimen seen is badly macerated, but does not seem 

 to be conspecific with A. andamanica Goodrich, which it undoubtedly 

 much resembles. The chief differences appear in the detailed dis- 

 tribution of the photogenic organs. In the present species the two 

 median series of large organs which adorn the ventral aspect of the 

 mantle are an especially conspicuous feature. 



PTERYGIOTEUXmS MICROLAMPAS, new species. 



Body small, cylindro-conical, terminating posteriorly in a sharp 

 spine-like process extending well past the rather large circular fins; 

 fins attached along their inner margins for less than half their total 

 .length. 



Head large, rounded; eyes large and prominent. 



Arms short, nearly equal, their order 3, 2 =.4, 1; suckers in two 

 rows, on the dorsal arms about 14 pairs, the ventral members of the 

 eighth to tenth pairs transformed into hooks; second and third arms 

 similar; ventral arms without hooks, their suckei*s very minute and 

 confined to the more distal portion of the arm. Tentacles stout, 

 but little longer than the arms; stalk thickened but constricted at 

 base; club not expanded, bearing four series of minute suckers, of 

 which the five proximal members of the dorsal row are distinctly the 

 largest; two suckers and two pads in the fixing apparatus on the 

 carpus. Subocular photogenic organs 14 in number; arrangement 

 very similar to that described for P. giardi Fischer, but four uistead 

 of five small anterior organs, and the most anterior of these displaced 

 laterally so that it is not in line with the others. 



Type.— Cat. No. 214386, U.S.N.M. [S. S. B. 277]. From Albatross 

 station 4105, in the Kaiwi Channel. 



