Berky- 



IKVIEW OF CEPHALOPOD GeNEKA 



359 



Chart Xo. 1 1 and fig. 65. 



Type Locality. Kadsiyama. Bay of 'I'cikyn, Japan ((Jrtmann). 



Rccanicd Disfrihiitioii- japan: Kadsiyama ( ( )i-tniann ) ; Misaki, Sagami 

 (Sasaki); Inland Sea (Sasaki). 



!\ciniirhs. ( )n the ground only of Ortmann's 

 scanty dtitii I once expressed the opinion that this 

 species might i)rove cospecific with /. pygmaeits, l)Ut 

 the nnicli more complete information since given by 

 Sasaki con\inces me that the Japanese Idioscpius is 

 clearly a distinct species. A little larger than /. p\(j- 

 inacus. it further differs in the short, thick tentacles, 

 suckered for one-half eir mcjre of their length, the 

 development of a semicircular flap near the tip of the 

 left ventral arm in the male, and the persistence of 3 to 7 suckers on the basal 

 (Hirtion of each modified arm in the male. 



The mantle length of the specimens examined by Ortmann and Sasaki is 

 given as 8-10 mm. 



I'ig. 65- Schematic view of 



\entral arms of male, oral 



aspect (after Sasaki). 



IDIOSEPIUS PICTETI Joubin, 1894. 



iSi;4. LoVuio pictcti Joubin, Kev. Suisse Zoo!., ii, p. 26. 60-64. pi. iii, iv. 

 1895. Idioscpius pictcti Joubin, Rev. Suisse Zool., iii. p. 460. 

 Chart No. 11 and fig. 66. 



Type Locality, .\mboina (Joubin). 



Recorded Distribution. Known only fr(jni the type locality. 



Reniarlcs. This species comes from the very midst 

 of a region rei)orted to be inhabited by /. pygmaeus. 

 but it seems to be a very distinct form. Here the right 

 \entral arm in the male is very short and broad, its oral 

 surface thrown into about twelve heavy transverse 

 plications, while its aboral surface bears a deep longi- 

 tudinal furrow. The left ventral arm is more slender 

 and is longer than its mate. Each arm of this pair bears 

 a single small sucker near the Ijase. (Jther than the 

 sucker and a flattened, tongue-like ])rocess on the inner face near the tip. the 

 left arm is unornamented. 



(Jther peculiarities are the small tentacle clubs, the curious fimbriated edging 

 which surrounds the narrowh' delimited sucker-bearing area on the clubs, and 



Fig. 66. Schematic \iew of 



ventral arms of male, oral 



aspect (after Joubin). 



