968 =  ~—s TRANS. OF THE ACAD. OF SCIENCE. 
around the large holes, which gives to ri whole a peculiar 
and graceful appearance. This arrangement is given by ale 
ternate expansions and contractions Yc the b 
coalescence of the rays. In regard to the large holes or dim- 
they are only apparently filled with foreign matter; on 
on g the 
e hides cells present, in one form, the chacanteusia as 
ed them by Keyserling, but this form seems to be the re- 
It of weathering. In perfectly preserved surfaces of two 
psa: of a new species, they are sube beircular, with a dis- 
tinetly raised lip. 
atathamaens new species above referred to, the Heyeringt 
Sad thatthe long elliptical dimples are arranged i in oblique 
lines on two sides of a middle row of elliptical dimpies, ™> 
ning perpendicular ly, or. as the barbs of a feather upon ™ 
vane; this middle of dimples is found at the bottom ' 
mnie ing ore broad and Soop jon 
Di Bi a eS rie 
die rm the Excara her tebes  ewo posite TOW! 
pn ac RN SI 
