CEPHALOPODS OF THE PHILIPPINE ISLANDS 55 



chromatophores on the aboral surface giving a barred effect. There 

 are additional pigment spots on the arms on each side near the base 

 of the outer row of suckers. 



There is no gladius. 



There is a prominent saddle-shaped luminous organ on the ventral 

 surface of the ink sac. 



Measurements and indices of eight specimens of Euprymna steno- 

 dactyla Grant are: 



Type. — Not traced. 



Type locality. — Mauritius. 



Discussion. — -In the present study I have disregarded the structure 

 of the suckers of the tentacular club, which Adam (1954, p. 127-128) 

 discussed briefly, because I do not think that such highly modifiable 

 structures are of any real value when the object itself is so minute and 

 the organs subject to change in shape from strong crowding. If one 

 disregards these structures and centers upon the size and arrangement 

 of the arm suckers, some cohesion becomes apparent. I have 

 examined specimens of E. morsei and berryi from Japan, and find that 

 they consistently conform to the illustration and description given by 

 Sasaki (1929, p. 144). 



A paratype of Berry's scolopes, also available for direct comparison, 

 does not approach these specimens. Hoyle's description of steno- 

 dactyla Grant corresponds very closely and differs only in the lack of 

 keels in the Arno Atoll specunens (probably due to preservation). 

 Hoyle gives the arm order as 3.2.1=4. Grant said that they were 

 equal, but his figure distinctly shows III to be the longest. In 1954, 

 I published on some Euprymna from the Marshall Islands, calling them 

 stenodactyla. One of these is available to me for direct comparison 

 and again close agreement is found. The Marshall Island specimen 

 differs from the present material only in having two or three enlarged 

 suckers on the ventral row of III (4 in present specimens) and one or 

 two enlarged suckers on the dorsal row of IV. This slight variance 

 may easily be geographical and varies in the same degree from those 



