CEPHALOPODS OF THE PHILIPPINE ISLANDS 97 



none around the sinus and none dorsoposteriorly. In the midline of 

 the head a single row of about 12 Hght organs originating between 

 the bases of arms IV and terminating posteriorly at about the level 

 of the eye pupils. On either side is a row of light organs originat- 

 ing as the middle row of arms IV and extending posteriorly as a 

 single row to the level of the eye pupils. Here, demarcated on either 

 side by a single large photophore, the row divides into two, the inner 

 row leading directly posterior into the funnel groove and terminating 

 beside the funnel supports, the outer branch turning slightly outward 

 and terminating at the base of the olfactory crest. The outer row 

 of light organs originates at the web between arms III and IV in a 

 cluster of photophores partially composed of the lower light organs 

 of arms III and IV. From there it partially encircles the eye ven- 

 trally as a semicircle, terminating posteriorly in a line drawn from 

 the olfactory crest to the lower edge of the eyelid. 



Upon the ventral arms are three rows of light organs, the ventral 

 and middle rows extending nearly to the tip of the arm, the dorsal 

 row merging with the middle row about a third of the length of the 

 arm from the base. There are a few scattered light organs on arm 

 III, both dorsally and ventrally but not extending to the tip, a single 

 light organ dorsally on the base of the arms II, and a pair of closely 

 set photophores in the midsection, one on each arm I. 



The number and position or order of the hght organs on the ventral 

 periphery of the eyeball is confusing. In two specimens (ML 21.5 

 mm. and 29.5 mm.) they are in the order extra large, medium, smaU, 

 medium, small, medium, large (seven in number); in a female 23.0 

 ML they are large, small, small, small, small, large; and in a female 

 21.0 ML they are large, medium, medium, small, large. In the re- 

 maining six, including two males, they are in the order large, medium, 

 medium, small, medium, large, and are consistent on both sides. This 

 order is somewhat the same as figured by Grimpe for A. renschi. The 

 posterior large organ is somewhat half-moon shaped, the anterior one 

 oval and often reduced. 



In addition to the light organs, A. armata may be unique in having 

 a large luminous organ on the ventral surface of the ink sac. The sac 

 is broadly oval and black, but extending across the ventral surface 

 and up the sides laterally is a distinctly demarcated bronze and pearly 

 iridescent layer which appears to be similar to the luminous hght 

 organs foimd on the ink sac in some other groups. If there is a lu- 

 minous organ, armata is unique among the Abralia, of which it is 

 definitely a member, in having an internal photophore. 



The two males (ML 27.0-29.0 mm.) had numerous spermatophores. 

 An examination of the ventral arms of these two specimens showed 



