1912.] NATURAL SCIENCES OF PHILADELPHIA. 421 



keeled. Membranes bordering the sucker-bearing area well devel- 

 oped. Suckers minute, cup-shaped, in four rows on all the arms; 

 horny rings smooth. A narrow umbrella connects all the arms at 

 the base. 



Tentacles rather short, stout, the clubs very large. Suckers 

 in about four to five rows; those of the two marginal series very 

 minute, the median ones slightly larger and about six of the latter 

 very much larger than any of the others, the three nearest the mid- 

 dle of the club being largest of all (PL IX, fig. 7). The latter have 

 smooth horny rings while those of the smaller suckers seem to be 

 very minutely denticulate or crenate. 



Surface smooth throughout. 



Color dull buff-gray, heavily mottled above and more lightly 

 dotted below with blackish-slate-colored chromatophores. 



Gladius elongate-elliptical in outline, a little over one-third as 

 broad as long; chitinous margin quite wide and narrowly continuous 

 posteriorly across the short stout straight spine. Dorsal surface 

 finely rugose-granulose, the granules disposed in concentric series 

 parallel to the anterior margin; two shallow converging grooves 

 near the centre divide the shell into a narrow median and two wide 

 lateral areas; the calcareous coating over the chitinous layer is very 

 thin dorsally, especially near the edges. Ventral surface excavated 

 posteriorly; the striated area occupies about half the length of the 

 shell, but its extreme posterior portion is obscured by the heavy 

 callous which strengthens the inner cone. The limbs of the callous 

 arise near a point a little more than one-third the length of the shell 

 from the posterior end. Locular index (inclusive of chitinous 

 margin) about 43. 



Type. Cat. 2,049, Invertebrate Series, Stanford University 

 Collections [S. S. B. No. 361]. 



Type Locality. Takao, Formosa (Hans Sauter) ; one specimen. 



Measurements. 



mm. 



Tip of body to base of dorsal arms 82 



Median length of mantle (dorsal) 72 



Median length of mantle (ventral) 64 



Width of mantle 37 



Width of fin at widest point 11 



Width of head 31 



Length of funnel 26 



Length of dorsal arm 35 



Length of second arm 31 



