e 



THE OPHIURIDiE. 



155 







rounded or almost straight, much stress camiot be laid upon that difference. 



*■ 



The naked space which separates the side arm-plates is not mentioned by 

 LymaN; nor seen in his figure ; it is not distinct from the dorsal side. All 

 the primary plates are distinct, but small -, Lyma]^ mentions only the cen- 

 tral plate. Along the outer edge of the radial shields there are one or 

 more narrow scales. The inner arm-joints have 4-6 spines. In regard to 

 the tentacle scales, they correspond in the curious fact that such are found 



only on a few of the inner joints. ' In one specimen they had the form 

 seen in Figure 11. 



Our specimens are larger than Lyman's, the largest being 15 mm. in 

 diameter of disk. The arms are broken. 



Lyman's specimens were taken in the Atlantic, Lat. 36° 44' S., Long. 

 46° 16' W., 2650 f , gray mud. 



35- Amphiura granulata n. sp 



^ 



ys 



Plate X. Figs. 1-4. 



Diometer of disk, 6 mm. ; width of arm close to disk, 1 mm. ; length of 

 arms, c. 9 times the diameter of the disk. Two mouth papilla) on each side, 

 making a continuous row with those on the apex; the outer one is the 

 widest; both are flat and rounded. Mouth shield rhomboidal, with an acute 

 angle within, the sides a little re-enteringly curved, corners rather sharp. 

 Side mouth shields somewhat curved, outer end a little broader than the 

 inner end where they meet. 



First ventral plate very small, thick, and swollen, forming a little tubercle 

 at the outer end of the mouth slit. Those beyond inconsiderably more w^ide 

 than long, all more or less distinctly separated. They have an angle 

 within, enter edge doubly curved, with a cut in the median line ; inner 

 laterals re-enteringly curved, outer almost straight; outer corners rounded. 

 A feeble keel along the median line. The side arm-plates with rather 

 prominent spine-ridge (not sufficiently prominent in the figure). No naked 

 space separating the side arm-plates distinct. Dorsal plates twice as broad 

 as long, rather broadly in contact; with an obtuse truncated angle within, 

 sides feebly curved, outer corners sharply cut (not sufficiently distinct in the 

 figure). A feeble keel along the upper side of the arm. 



Dorsal side of the disk covered with small, delicate, overlapping scales, 

 among which the primary plates are not distinct; along the margin are 



/*• . 



