OPHIUHA. ECHINODERMATA. 403 



A. nodosa, Lin. With five carinated and spinous rays ; margin un- 

 armed. Inhabits Indian seas. Lam. ii. 557- 



A. papposa, Lin. Back and margin muricated with pappose pen- 

 cils, reddish or ferruginous., with twelve to fifteen lanceolate rays. 

 Inhabits European and Asiatic seas. Lam. ii. 559. 



A. endeca, Lin. Rough, with very small spines, and from six to 

 nine tortuous rays. Inhabits Northern seas. Lam. ii. 560r 



** Rays much longer than the diameter of the central disc. 

 A. glacialis, Lam. With five long, tortuous, angular-ribbed rays ; 

 ribs warty and spinous ; three dorsal ribs. Sometimes 1^ foot 

 in diameter. Inhabits Northern ocean. Lam. ii. 561. 



A. rubens, Lam. With five lanceolate papillous and spinous rays ; 

 papillae of the back scattered, and nearly in rows. Common in 

 the seas of Europe Lam. ii. 562. 



A. aranciata, Lin. Disc wide, with five depressed lanceolate rays ; 

 back rough with short spines ; margin articulated and ciliated 

 with spines. Inhabits seas of Europe. Lam. ii. 563. 



Gen. 17. OPHIURA, Lani. 



Body orbicular, depressed, with the back naked, and a row of 

 slender, elongated, cirrous, simple, papillous or spinous rays 

 upon the sides, almost pinnated ; lower surface of the rays 

 flattened, and destitute of furrow or canal ; mouth inferior 

 and central ; pores in the vicinity of the mouth. 



The Ophiuras have in general a very small body, and the rays are very long, cir- 

 rous, scaly, and articulated. These rays are furnished on both sides with short pa- 

 pillae, or spines disposed in transverse rows, but the spines are only articulated at 

 their base. The rays which have spines appear as if pectinated. The animal uses 

 the rays as a species of legs for the purpose of locomotion. The stomach has no 

 crecums. 



* Rays rounded or convex on the back. 



O. lacerlosa, Lam. Rays elongated, smooth and subulate ; lateral 

 papilla very short, often adpressed in a transverse series. Inha- 

 bits seas of Europe. The rays resemble the tail of a lizard. 

 Lam. ii. 542. 



** Rays flattened on the back. 



O. squamata, Lam. Disc orbicular and smooth ; back of the rays 

 with broad imbricated scales ; spines of the margin short. Inha- 

 bits European and Atlantic seas. Lam. ii. 545. 



O. fragility Mull. Back of the disc rough with spines, and ten li- 

 near and subulate rays, spinous and pectinated at the margin. 

 Inhabits Northern ocean. Lam. ii. 546. 



Gen. 18. EUR YALE, Lam. Asterias, Lin. 

 Body orbicular, depressed, with the back naked, divided in its 

 circumference into a row of slender elongated dichotomous 

 rays, which are subdivided and cirrous ; rays flattened below, 

 and cylindrical on the back ; mouth inferior and central ; ten 

 elongated openings under the disc, and towards its margin. 



