SHUMARD—NEW PALAEOZOIC FOSSILS. 
113 
El^acrinus Kirkwoodensis, n. sp. 
Body very small, subglobose, a little longer than wide, flat¬ 
tened above and below. Basal pieces very gently concave, 
with their edges on a level with the plane of the under side. 
Radial pieces (fork pieces) reaching to the base and occupy¬ 
ing niore than four fifths the entire length of the body, narrow 
below and widest in the middle, sides gently arched. Interra- 
dial pieces subdeltoid, very prominent towards the apex, much 
longer than wide, obtusely angulated below, acutely angulated 
above, and notched on either side a short distance below the 
summit. Pseudo-ambulacral areas extending from base to 
summit, narrow,'deeply impressed; sides nearly parallel; pore 
pieces amounting to about fifty in each field. A longitudinal 
fissure of slit extends from the central summit opening down¬ 
wards, separating\the pore pieces of one side from their fel¬ 
lows of the opposite for the distance of about one fifth the 
length of the field, thence their inner edges are united in the 
median line to the base. Pseudo-ambulacral spaces lanceo¬ 
late, sloping gently from their edges to the sutures. Ovarial 
apertures eight, very minute, situated at the notches of the 
nradial plates. Anal o pening large, circular or very slight- 
JuojLplaiiily. exhibited. 
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