1912.1 



NATURAL SCIENCES OF PHILADELPHIA. 



387 



by the various other writers on Japanese cephalopods. The fact 

 that the lateral arms are usually notably longer than the others, 

 the minute conical hectocotylus, reticulate surface, and reddish- 

 gray color seem to be very characteristic. The lateral arms in the 

 male show a conspicuous enlargement of one or (occasionally) more 

 of the suckers near the umbrella margin, as has been noted in numer- 

 ous other species. 



The dimensions of two cf specimens are given below : 



[No. 339] 



mm. 

 Total length to tip of arms 610 2 



Length of mantle (dorsal) '. 101 



Width of mantle 85 



Width of neck 47 



Width of head 53 



Length of funnel .-. 45 



Length of right dorsal arm, outside measurement 395 2 



Length of left dorsal arm, outside measurement 410 2 



Length of right second arm, outside measurement 470+ 2 



Length of left second arm, outside measurement 440 2 



Length of right third arm, outside measurement 380 2 



Length of left third arm, outside measurement 420 2 



Length of right ventral arm, outside measurement.... 380 2 



Length of left ventral arm, outside measurement 380 2 



Length of hectocotylus 4 



Length of umbrella between dorsal arms 55 



Length of umbrella between ventral arms 70 



Diameter of largest sucker 20 



Material Examined. 



[No. 337] 



mm. 



355 2 



71 



60 



39 



40 



33 



220 2 



200 2 



265 2 



245 2 



205 2 



250 2 



230 2 



225 2 



3 



50 

 35 

 13 



2 Measurements necessarily inaccurate. 



