NOTES ON THE CEPHALOPODA. 



365 



length ; skin firm, shagreen-like, being thickly covered with uniform warts. 

 Body oblong ; sides with neither tubercles nor ridges. Umbrella of a 

 moderate breadth, distinctly narrower between dorsal than between ventral 

 arms. Funnel organ deeply W-shaped. 



Arms slender, subequal ; dorsal pair the shortest. Right third arm 

 weakly hectocotylized, only a little shorter than the corresponding arm of 

 the opposite side ; apical organ l / n the entire length ; suckers in the normal 

 part in 59-70 transverse series. 



Frequently a few broad and dark longitudinal stripes on the back of 

 head and body, but no brick-colored patch either on head or on mantle. 

 In front of and below each eye, there is found a conspicuous black round 

 patch containing a small shining cobaltic or violet ring which never ex- 

 ceeds 4 mm. in diameter. The patch lies nearer to umbrella margin than 

 to eye. 



Branchial leaflets number 15-17 in each gill. 



General shape of vas deferens in situ hemispherical and cup-like, 

 covering over antcro-lateral parts of testis; Needham"s sac long, encircling 

 the vas deferens and testis meridionally ; spermiduct moderately long. 

 Penis slender, conspicuous, bent into V-shape, forming a swollen, elliptical 

 and well marked diverticle at the anterior extremity of the inner lobe ; 

 Needham's sac connected to the diverticle. Spermatophore 49-61 mm. 

 long; its spermatic part 23-27 mm. long, containing 230-270 coils of 

 sperm cord. 



Vagina thin, with a marked S-like curve in the middle of its course, 

 terminating a short distance posterior to anus ; oviducal ball situated on the 

 dorsal side of ovary. Ovarial ova very small, attaining only 2-3 mm. in 

 length, even when ripe. The specific name ovulum refers to the small size 

 of ova. 



Numerous specimens of the species purchased in the Tokyo market 

 are preserved in the Sci. Coll. Tokyo. 



Polypus parvus sp. nov. 

 Adult very small, only a little over 100 mm. in total length ; skin firm, 



