EEVISION OF PALEOZOIC STELLEROIDEA. 277 



EUCLADIA WOODWARDI Sollas. 



Plate 37, figs. 1, 2. 



Eucladia woodwardi Sollas, Quart. Jourii. Geol. Soc. London, vol. 55, 1899, p. 

 695, figs. 1 and 2 on p. 694. 



Original description. — Ten specimens "agree in presenting five 

 paired series of appendages, proceeding from the ventral surface 

 of the body, which now possesses a more or less oval outline. The 

 specimens arc all of nearly the same size, the central body measur- 

 ing about 2 by 3 cm., the longest arms 2.5 cm. in length, and about 

 3 mm. in breadth where broadest. Not more than four, possibly 

 only three, paks of arms can be traced in connection with each 

 radius, but an additional pair may have existed close to the buccal 

 armature, and have since become crushed out of recognition. 



" The dorsal surface [fig. 1]. — This is completely covered by nu- 

 merous rounded polygonal or u-regular scales, about 0.2 mm. thick 

 and not exceeding 5 mm. in diameter; their surface is richly granu- 

 lated. They are not arranged according to any discoverable law, 

 though there may be a tendency to run parallel with the ambitus. 

 In theu" present state they overlap each other to such an extent 

 that one plate may be haK concealed by another; no doubt they 

 w^ere imbricated during life, but the excessive overlap now presented 

 is probably due in part to crushing. The du-ection of the imbrica- 

 tion is upward, that is, in the direction opposite to that of tiles on 

 a roof, and thus resembles the imbrication of the dorsal surface of a 

 recent Ophiuroid, The plates are all of the same nature, and there 

 are no openings on the dorsal surface. 



" T/ie ventral surface [fig. 2]. — In the center the powerful buccal 

 armature is a very conspicuous object. It consists of five pairs 

 of strong plates or ossicles, precisely similar in their form and 

 arrangement to those of Eucladia johnsoni. Around the armature 

 are numerous small plates, irregularly disposed; from their form 

 and size these may be regarded as elements of the test, though they 

 may possibly include remains of crushed arms. If, as judging 

 from analogy we might suppose, minute arms proceeded from the 

 outer angles of the jaws, they have since disappeared. 



"Outside the irregularly scattered small plates larger ones are 

 seen arranged; along the five radii these are escutcheon-shaped, 

 imbricated, and form a single series of three. DistaUy, each plate 

 is produced into three processes, a single median and two lateral; 

 the angle formed by the side of the plate and each lateral process 

 is rounded and thickened to form one side of a circular aperture 

 for the passage or insertion of the arm, and the other half of the 

 aperture is completed by the thickened margin of a similarly exca- 



