AMPIIIURIDAE 



273 



St. 144. 5. i. 27. Off mouth of Stromness Harbour, South Georgia, 155-178 m. 12 specimens. 



St. 148. 9. i. 27. Off Cape Saunders, South Georgia, 132-148 m. i specimen. 



St. 149. 10. i. 27. Mouth of Cumberland Bay, South Georgia, 200-234 m. 2 specimens. 



St. WS 27. 19. xii. 26. 53° 55' S, 38° 01' W, South Georgia, 107 m. 2 specimens. 



St. WS 33. 21. xii. 26. 54° 59' S, 35° 24' W, South Georgia, 130 m. ca. 20 specimens. 



St. MS 71. 9. iii. 26. East Cumberland Bay, South Georgia, 110-60 m. 2 specimens. 



Diameter of disk apparently not surpassing ca. 5 mm. ; arms short, not more than 

 four to five times the diameter of disk. Circumference of disk round. 



Dorsal side of disk with rather large, irregular scales, the largest at the centre ; primary 

 plates not distinct. Radial shields short, rather broad, widely diverging, sometimes 

 contiguous distally. Ventral interradii wholly covered with rather large scales; the 

 proximal part of the interradii in the adult usually more or less swollen (on account of 



Fig. 13. Amphiura monorima, n.sp. Part of oral side (a) and dorsal side (/)). ■: 20, 



the sexual products). Buccal shields with a rather sharp inner angle and a broad 

 truncated outer lobe. Adoral plates joining within, generally broadly so. Outer mouth 

 papilla rounded, very small, sometimes totally wanting, infradental papillae rather 

 pointed, well developed. The pore of the outer mouth tentacle continues inwards in a 

 furrow, produced by the scale of the inner mouth tentacle being somewhat raised. 

 As the jaws are somewhat sunken the part of the mouth frame proximally to the adoral 

 shields is rather conspicuously sunken; round this sunken part the adoral shields, 

 together with the buccal shields and the first ventral plate, form a somewhat raised 

 pentagon, the corners of which are occupied by the buccal shields. The sides of the 

 pentagon are slightly concave. 



The first ventral plate is rather large, elongate hexagonal, contiguous with the second 

 plate, which has a truncate inner end. The following ventral plates are merely in contact 

 or slightly separated ; they are about as long as broad, with a slightly convex outer edge. 

 The dorsal plates are contiguous, having a truncate inner angle and a slightly convex 



