THE OPHIURID^. . 187 



Radial shields broad and flat, covering almost the whole dorsal side of 



the disk. Genital slits very short. 



Stations 3360, 1672 f. (2 specimens); 3375, 1201 f. (1 specimen); and 

 3376, 1132 f. (1 specimen). With the A. Locanli Koehler (64) there are now 

 known five species of Asteroni/x. (The A. tcnuisjnna Verr. was later trans- 

 ferred to the genus Ilcmieiirycde by VEmiiLL himself.) These species may 

 be thus distinguished : — 



1. The arm-spines transformed into hooks (except the lowest) ...... 2. 



The arm-spiues not transformed into hooks 4. 



2. Lowest arm-spine not elongated - A. Locardi'^odihx, 



Lowest arm-spiuc elongated . . j ^• 



3. Arms about equally long and large A. LoveniU.Tx. 



Anns unequal ; the lowest arm-spine prolonged only on the large arms . . A. dlspar Ltk. & Mrtsn. 



4. Side arm-plates elongated ; genital slits long A. ex cav at a l.iV. tmi^^x. 



Side arm-plates not elongated ; genital slits very short , A. plana Ltk. & Mrtsn. 



65. Astroschema sublsevo n. sp. 



riate XXTT. FJss, 13, 14. 



Diameter of disk, 12 mm. ; width of arm close to disk, 5 mm. ; height of 

 arm, 5 mm. ; length of arms, c. 300 mm. Mouth angles and the whole 

 under side usually perfectly smooth ; a few specimens, however, have some 

 small grains on the ventral side of the disk ; 8-9 well developed, rounded 

 teeth. Usually no mouth papilla) distinct, only some few grains at the sides 

 of the apex. In the smaller specimens the mouth papilla) may be rather 



distinct. 



The rather high arms are wholly naked below ; the sides and the dorsal 



side of the arms and the dorsal side of the disk covered with round rough 

 grains of different size, smaller on the sides, larger on the dorsal side of the 



On the disk the ribs are closely covered with large grains, the spaces 

 between them only sparingly beset with smaller grains. The genital slits 



arms. 



almost as high as the side of the disk. 



At the first two pores there are no tentacle scales (or arm-spines), at the 

 third one or two, and from the fourth there are two, sometimes three. The 

 inner one is elongated, in the middle part of the arm as long as two joints, 

 club-shaped, enclosed in thick skin ; the outer one is scarcely longer than 

 half a joint ; the end is rough, especially on the large one. 



Color in alcohol : brown. 



