RECENT OPHIURANS. 253 



680. A. CUNEATUS (Lyman). 



Amphiura cuneaia Lyman, 1878. Bull. M. C. Z., 5, p. 225, pi. 2, f. 34-36. 

 Atnphioplus cuneata Verrill, 1899. Trans. Conn, acad., 10, p. 314. 



3 specimens, including holotype and 1 paratype. Gulp of Mexico, 399 

 fms. Off Grenada, 370 fms. 



681. A. CYRTACANTHUS, sp. nov. (wpros, bent + iiKavSa., spine). Plate 7, f. 14, 15. 



Disk wanting and arms all broken, but judging from scars and estimating 

 by proportions, it is probable the disk was 8-10 mm. in diameter and the arms 

 75-100 mm. long. Upper arm-plates transversely elliptical but not twice as 

 wide as long; all in contact. Oral shields distinctly longer than wide, somewhat 

 diamond-shaped with rounded angles, the proximal half wider than the distal; 

 madreporite much larger than the others and more oval. Adoral plates rather 

 small but just meeting within. Oral papillae 4 on a side, and the tentacle- 

 scale of the first oral tentacle being nearly in the same plane, there is the appear- 

 ance of 5 on a side; subdental papillae very large and thick; the others small 

 and scale-like, the penultimate largest. Under arm-plates somewhat longer 

 than wide, more or less in contact; distal margin with a shallow notch. Side 

 arm-plates narrow and prominent but not meeting either above or below; each 

 one carries a series of sharp spines, more or less abruptly bent at the tip (hence 

 the name); on the basal joints there are 6 of these spines, of which the third 

 or fourth (from above) is smallest, the lowest the longest; the number of spines 

 soon drops to 5, at the middle of the arm there are only 4 and distally only three; 

 as the number decreases, the spines become subequal; everywhere the longest 

 spine greatly exceeds a joint. Tentacle-scales 2, but very small and the one on 

 the under arm-plate is not infrequently wanting distaUy. Color (dried from 

 alcohol), very pale brown. 



Holotype (M. C. Z. 1489) Philippine Islands. "Muddy sand and 

 stones." Semper collection. 



In spite of the loss of the disk, I have no hesitation in describing this speci- 

 men, since the hooked arm-spines form such an obvious distinguishing character. 



682. A. DALEA (Lyman). 



Amphiura dalea Lyman, 1879. Bull. M. C. Z., 6, p. 27, pi. 12, f. 320-322. 

 Amphioplus dalea Verrill, 1899. Trans. Conn, acad., 10, p. 315. 



4 specimens, including 2 cotypes. Off mouth of Rio de la Plata, 

 2650 fms. Gulf of Panama, 1471 fms. Lower California: southwest from 

 Magdalena Bay, 1760 fms. 



