MONOGRAPH OF JAPANESE OPfflUKOIDEA. 49 



is very small, cylindrical, enclosed in skin, more or less rough at 

 the free end. The adradial one is club-shaped, enclosed in skin, 

 very rough at the free end. The arm spines are largest at the 

 middle of the arms, the adradial one being one and a half times 

 as long as, and the abradial one a little shorter than, the cor- 

 responding arm joint. They are transformed into compound hooks 

 with three to six booklets towards the very extremity of the arm. 

 The oral tentacle pore and the first three or four tentacle pores 

 are provided with tubes. 



Colour in alcohol grayish brown. 



Like A. intectum Lyman and A. migrator Kœhlee, this 

 species appears to be an intermediate form between the sections 

 Asteroschema s. str. and Oplnocreas. 



Asterosche/ina (Ophiocreas) caiidaficni (Lyman). 



OpUocreas caudatus : Lyman, Bull. Mus. Comp. Zool., VI, 1879, p. 64, 

 PI. XVI, figs. 439-442; Lym.\n, Eep. Challenger, V, 1882, p. 281, PI. 

 XXXn, figs. 5-8. 



Ophiocreas œdipus : Claek Bull. U. S. Nat. Mus., LXXV, 1911, p. 

 283. (Non Lyman, 1879.) 



Asteroschema {Ophiocreas) sagamimim : Döderlein, Abh. Math.-Phys. 

 Kl. K. Bayer. Akad. Wiss., Suppl.-Bd. I, 1911, p. 60, PI. VI, figs. 6 & 

 6 a, PI. Vn, fig. 10. 



Asteroschema {Ophiocreas) caudcdum : Döderlein, ibid., p. 113. 



One specimen ; Otaba, Sagami Sea ; 420 fathoms. Numerous 

 specimens ; outside Okinosé, Sagami Sea ; 330 fathoms. Numerous 

 specimens ; Sagami Sea. 



These specimens range from very small to very large ones. 

 In the largest one, the disk is 25 mm. in diameter, and the arms 

 are 420 mm. in length and 7.5 mm. in width. The oral tentacle 



