302 



DISCOVERY REPORTS 



small plates in the corners between the primary plates, in larger specimens the primary 

 plates are wholly separated by smaller plates. Generally there are two larger plates in the 

 interradii. The radial shields are small, oval, widely separated by a series of two to three 

 plates. The ventral interradii are covered by a varying number of plates, none of which 

 are particularly conspicuous. The genital slits are narrow and short, not reaching beyond 

 the end of the first lateral plate. The buccal shields are slightly irregular, with an acute 

 inner angle; the inner sides concave, the outer edge convex; they may be distinctly 

 longer than broad, or equally long and broad, there being thus a rather considerable 

 variation in their shape. The adoral shields are short, broad distally, narrowing towards 



Fig. 30. Ophiozonella falklaiidica, n.sp Part of oral side (a). <i2. Dorsal side of two different 



specimens {b,c). b, xg; c, x6. 



the median line, where they join; sometimes, however, they are about equally broad 

 in their whole length, almost square. There are three or four square mouth papillae; the 

 teeth are broad, rounded. 



First ventral plate broader than long, with rather sharp corners. The following ventral 

 plates contiguous till some distance beyond the disk; their outer edge somewhat pro- 

 duced. Dorsal arm plates contiguous on the proximal three or four joints, with straight 

 sides and strongly convex distal edge. Two short, conical arm spines, the lowermost the 

 longer, not half the length of the arm joint. One large, oval tentacle scale. Colour of 

 the preserved specimens whitish. 



This species is viviparous, but not hermaphrodite. There is only one gonad at each 

 bursa, placed interradially. Some of the larger specimens, 6-8 mm. diameter of disk. 



