OPHIUROIDEA OF THE BAHAMA EXPEDITION. 55 



is no distal emargination, but rather an obtuse angle. The 

 outer edge bears a row of five to seven small, conical grains. 



The adoral plates are nearly as described; one of the nar- 

 row outer lobes separates the oral shield from the first side 

 arm-plate; the other joins the first under arm-plate. The 

 latter is small and emarginate on its inner end. The other 

 under arm-plates differ a little from the description; they are 

 nearly truncate on the inner end, or else very obtusely angu- 

 lated, without any obvious "peak." 



Upper arm-plates are small and nearly as described; they 

 might be called narrow fan-shaped or quadrant-shaped, the 

 outer end being well rounded. The arm-spines are as de- 

 scribed, they are serrulated, but not rough for this genus; the 

 flattened ones are finely serrulate on the edges; the basal 

 rows are not closely approximate dorsally. The tentacle- 

 scales are rather broad and flat, lanceolate or ovate, and do 

 not rapidly change distally. One example has two pairs on 

 several basal joints. 



Diameter of disk, 6-9 mm. 



Off Havana, Sta. 2, no fathoms, one example. Taken by 

 the Blake Exp., in 123 to 411 fathoms. 



Amphipsila, gen. nov. 



Type A.fulva [Lym.) 



Disk rounded, covered with thin, naked scales, above and 

 below. Radial shields narrow, separated, naked. Arm- 

 plates distinct, above and below. Arm-spines of moderate 

 length, numerous (five to twelve) serrulate. Oral shields 

 clearly visible, at least when dry. A simple row of mouth- 

 papillae. Only two or three conical, apical papillae in a 

 marginal row; these may be considered as tooth-papillae, but 

 there is no distinct cluster of inner papillae, below the teeth, 

 as in Ofthiofisila. Tentacle-scale spiniform. 



Amphipsila maculata, sp. nov. 



