MONOGRAPH OF JAPANESE OPHIUEOIDEA. 



21 



the genuine or secondary oral papilla?. The primary oral papilla) 

 are usually predominant in many genera, which have exposed 

 second oral tentacle pores. 



Ophiodera anisacantha (Clark). 



OpMomyxa anisacantha : Claek, Bull. U. S. Nat. Mus., LXXV, 1911, 

 p. 277, fig. 136. 



One specimen; Suruga Gulf; 115 fathoms. One specimen 

 Mera-out-Oisegaké, Sagami Sea ; 300 fathoms. Five specimens ; 

 Sagami Sea. One specimen ; Uraga Channel ; 125 fathoms. 



Uraga Channel; 197 fathoms (Claek). Suruga Gulf; 108-131 

 fathoms (Claek). Off Suno Saki, Sagami Sea ; 83-158 fathoms 

 (Claek). Eastern Sea ; 95-181 fathoms (Claek). 



Diameter of disk 28 mm. Length of arms 140 mm. Widtli 

 of arms at base 4 mm. 



Disk pentagonal or five- 

 lobed, with concave or slightly 

 notched interbrachial borders, 

 covered by a thick skin, which 

 is finely and almost concentric- 

 ally wrinkled in alcohol. 



The radial shields can be 

 observed by drying the speci- 

 mens ; they are exceedingly 

 small and club-shaped. Genital 

 slits long, not quite reaching 

 the disk margin, narrow in the 

 outer part, bordered adradially 

 by the stout genital plates, 

 much widened in the inner part 





Fig. 4. OpUodera anisacantha. x3. a. From 

 above. 5. From below, c. Side view of four 

 arm joints near disk. 



