CEPHALOPODS OF THE PHILIPPINE ISLANDS 103 



these two large ones are three others, much smaller, round, and in 

 long preserved specimens sometimes indistinct. The two end ones, 

 nos. 2 and 4, are smaller than the middle one, no. 3, and placed very- 

 close to the adjoining terminal organs. The middle one is shghtly 

 larger than its companions and is placed about midway of the other 

 organs. I find no variation in size or arrangement of these organs in 

 any of the specimens. 



The light organs in the skin show considerable variableness in 

 numbers and patterns. On the body, head, and arms the photo- 

 phores are ventrally arranged, only a few on the dorsal surface of the 

 arms, head, and mantle. There is one near the base of arm II, plus 

 several smaller ones on the arm, and two on the head below the junc- 

 tion of I and II. On the ventral surface of the mantle the photo- 

 phores are crowded, indistinctly arranged in longitudinal rows and 

 in some specimens there appears to be a ventral clear midstripe devoid 

 of light organs. 



The ventral surface of the funnel bears numerous light organs in 

 orderly arrangement. 



The ventral surface of the head and arms bears numerous photo- 

 phores. On the ventral surface of the head there are 9 or 10 indistinct 

 rows of dark- type medium-size light organs. On the inner or ventral 

 side of arms IV a single row of light organs extends from near the 

 tip to the base of the arm; there the rows from the two arms unite 

 and descend to near the base of the head as a midline. The midrow 

 of each ventral arm extends from the tip to the base of the arms 

 where they converge slightly toward the midline and thence descend 

 into the funnel groove. The dorsal row of IV originates near the 

 tip and descends along the dorsal edge to the base where it tm"ns 

 slightly dorsal and then sharply turns back upon itself to describe 

 a semicircle around the ventral side of the eye, yet separated from 

 the eyelid circlet. Between this dorsal row and the midarm row 

 lie two short rows on the head, originating slightly upon the arm 

 and descending to near the base of the head. On the ventral surface 

 of the head are 10 large white photophores arranged in a regular 

 pattern : two in the midline, one on each side of the funnel and three 

 on each side of the head in a single row. There are also two on the 

 dorsal surface of the head and one near the base of each dorsolateral 

 arm and of each ventrolateral arm. There are 29 light organs 

 encircHng the eye on the right side of the male and twelve posteriorly 

 on the eyelid on a female examined. 



Measurements and indices of 27 females and 4 males of Abralia 

 andamanica Goodrich, 1896, with stations where collected, are as 

 follows: 



