OPHIUROIDEA OF THE BAHAMA EXPEDITION. 73 



In our specimen the oral shields are broader and less ovate, 

 the outer ends being more rounded than in Lyman's figure. 

 The under arm-plates are longer, narrower, and more shield- 

 shaped, the sides being strongly emarginate, and the prox- 

 imal end narrower; they are all, even at the base of the arms, 

 separated by the lateral plates. The tentacle-scale is very 

 small. The arm-spines are minute, near together, short, ob- 

 tuse, the lower one slightly larger. 



The basal upper arm-plate is very small, short, transversely 

 elliptical, partly concealed by three supplementary, thickened 

 disk-scales outside the ends of the radial shields; the second 

 plate is larger, thick, transversely elliptical; the succeeding 

 ones are top-shaped with rounded outer, and very acute inner 

 ends; sides incurved, usually not separated by the lateral 

 plates. The two basal plates are, therefore quite unlike Mr. 

 Lyman's figure. 



The disk-plates are very different from Mr. Lyman's fig- 

 ure; the radial shields are narrower and at their inner ends 

 there are five large, swollen, pear-shaped radial plates, their 

 points inward, and separated by about three small scales, and 

 with a small central scale. None of the disk plates bear 

 tubercles or granules. The disk is high and swollen and the 

 plates are not closely soldered together, as they are said to 

 be by Mr. Lyman. Color of the dry specimen yellowish 

 brown above, yellowish white below. 



Order II. EURYAL^ Mutter & Troschel, 1842. 

 Euryalidce Gray, 1840. 

 Astrophytonidce Norman, 1866. 

 Phytastra Haeckel, 1866. 

 Astrophytidce Lyman, Ljung-man and others. 



EuryalcE Ejung., Oph. Viv., p. 334, 1867. Carus Fauna Medit., p. 97, 



1884. 



Cladophiurce Bell, 1892. 

 Etiryalida of several authors. 



