OPHITTROIDEA OF THE BAHAMA EXPEDITION. 31 



Ophiura reticulata Say, Jour. Phil. Acad. Nat. Sci., V, p. 148, 1825. 

 Ophiolcpis nereis Eutken, Vid. Meddel., p. 11, March, 1856. 



Tortugas, four examples; Bahama Banks, two examples; 

 Egg Key, one example; off Havana, no fathoms, 1 example. 



Common in shallow water from Florida to Colon; Cumana, 

 and throughout the West Indies. Bermudas (Coll. Goode); 

 Abrolhos Reefs, Brazil, (Coll. Hartt). Bahia and Rio de 

 Janeiro (Rathbun). 



Ophioplax ljungmani Lym. 



Ophioplax ljungmani Eyman, 111. Cat. Mus. Comp. Zool., Vol. VIII, p. 

 22, pi. II, figs. 24, 25, 1875; Voyage Challenger, pp. 164, 314, pi. 

 XLJ, fig. 7 (anatomy). 



Sta. 13, off Havana, 200 fathoms, 6 examples. 

 Taken by the Blake Exped. in 80 to 250 fathoms. 



Ophiactis dispar Verrill. sp. or var. nov. 



Plate VIII; Figures 3 — 3^. 



Arms five. Radial shields large, elongated, semielliptical, 

 separated by a single narrow row of small plates, except dist- 

 ally; their inner edges nearly straight, diverging but little; 

 distal end thickened, bearing a small round knob; lateral 

 edges convex. Central and interradial areas covered with 

 pretty regular, small, very distinct scales, many of which bear 

 small conical spinules, especially near the center and close to 

 the margin. Arm-spines, six to eight; four, or sometimes 

 five of the lowe.r ones are white, short, subequal, flat at tip, 

 blunt, nearly parallel, and close together, two or three of the 

 upper ones are decidedly longer, abruptly different in color 

 and form, divergent, tapered, acute. Mouth-papillae two, 

 small, flat, placed close together, on each side of the distal 

 part of the mouth angles, just above the outer oral tentacle; 

 one small, oblong, flat, blunt tentacle-scale. Under arm- 

 plates about as long as broad, with the outer edge subtrun- 

 cate or rounded and with a thickened and raised rim; distally 

 they become longer than broad. Upper arm-plates trans- 



