RECENT OPHIURANS. 255 



it has not seemed proper to identify these specimens with that Australian species. 

 On the other hand there is no other species to which I can so well refer them. 

 The specimen from Yeddo Bay was examined by Mr. Lyman, who made a few 

 hasty sketches of certain detaUs and laid the specimen by with only the label 

 " Amphiura." The other specimens have come into the collection more recently 

 from the well-known Yokohama dealer, Mr. Alan Owston. 



691. A. MACILENTUS (Verrili,). Plate 8, f. 1, 2. 

 Amphiura madlenla Verrill, 1882. Amer. joum. sci., ser. 3, 23, p. 142. 



Amphioplus macilenta Verrill, 1899. Trans. Conn, acad., 10, p. 314. 



88 specimens, including 40 cotypes. Off Marthas Vineyard, 63 fms. 

 Off No Man's Land, 65 fms. 



692. A. MEGAPOMUS H. L. Clark, 1911. Bull. 75 U. S. N. M., p. 170. 



4 specimens, including 1 diskless paratype. Japan: off eastern coast, 

 37 fms. ; mouth of Bay of Yeddo. 



As this species was described from a diskless specimen, and no figures 

 were given, it may be added here that the disk is covered with a coat of scales, 

 about 16-18 series between center and margin and about 12-14 across an inter- 

 radial area between the radial shields; the interbrachial areas below are also 

 covered with very fine scales and where these meet the scaling of the upper surface 

 there is a sharp margin. Radial shields short and wide, 1.2 mm. by .7, closely 

 joined except at inner end. 



These specimens from the mouth of the Bay of Yeddo are evidently smaller 

 than the types of megapomus but they have the characteristic big tentacle-scales, 

 the long oral shields and only 3 arm-spines. The upper and under arm-plates 

 are not in perfect agreement with those of the larger specimen, but the differences 

 do not seem to be more than should be expected. 



693. A. NEREIS (Lyman). 



Amphiura nereis Lyman, 1883. Bull. M. C. Z., 10, p. 250, pi. 5, f. 61-63. 

 Amphioplm nereis Verrill, 1899. Trans. Conn, acad., 10, p. 314. 



Holotype. Off Montserrat, 148 fms. 



694. a. NOTACANTHUS (Lutken and Mortensen). 



Amphiura rwlacantha Lutken and Mortensen, 1899. Mem. M. C. Z., 23, p. 158, pi. 13, f. 7-9. 



1 specimen, diskless. Gulf of Panama, 1020 fms. 



695. A. PARVICLYPEUS, sp. nov. (parvus, small + dypeus, shield). Plate 7, f. 5-8. 



Disk, 10 mm. in diameter; arms 60-70 mm. long. Disk with big inter- 



