On a New Species of Star Fish, from the Forest Marble, Wilts. 
By Dr. Tuos. Wricut, F.R.S., F.G.S., &e. 
Genus.—Uraster—Agassiz, 1835. 
Body, stellate; rays, five, moderately long, cylindrical or 
lanceolate, deeply cleft on the under side, fringed below 
with rows of small, and laterally with larger spines. Skeleton 
composed of small irregularly-shaped and femur-like ossicula, 
articulated together in a reteform manner. Upper surface of 
the body studded with blunt or pointed spines, scattered or 
grouped together in tufts, and arranged more or less regularly 
in longitudinal rows. Ambulacral avenues wide, composed 
internally of two rows of long femur-like bones, spaced out for 
the four series of tentacula. Anal opening small, sub-central, 
madreporiform body simple. This genus first appeared in the 
‘Lias, and ranged onward through the Jurassic, Cretaceous, and 
Tertiary periods into our existing seas. 
Uraster sprnieera.— Wright, nov. sp. 
Diagnosis.—Rays, five, short, broad, curved and pelatoidal ; 
ambulacral areas wide; margins bordered by a series of 
small ossicles, which form beaded ridges on each side of the 
ambulacral spaces. The ossicles support numerous small, short, 
blunt spines which lie in profusion on the sides of the rays ; 
similar spines appear to have clothed the dorsal surface and are 
seen “in situ” in the twisted portion of one of the rays, as 
delineated in the subjoined figure, drawn by the late Mr. C. R. 
Bons, and enlarged two diameters. 
