Whole of th é 
ig however, upon further examination, they should prove to 
ere ak a a Se a i fala le Saad wi 
A. Hyatt on the Beatricee. 265 
chambers, as the septa are in Endoceras, and if, at the same time, 
the central cup-like cavities were supposed to be prolonged into 
cones, we should, without violence to the typical idea of the or- 
nization, have transformed the Beatricea into a shell separable 
tom the Endoceras by only one character, the vesicularity of the 
he analogies which the Beatricese have with plants in their 
general aspect, with Radiates in their internal vesicular struc- 
ture, and with Hippurites in the arrangement of the parts, are 
Close as to entirely bury, as it were, their true affinity wit 
80 
Cephalopoda, which ‘only becomes obvious after diligent com- 
s 
There still remains a question which I have not been able to 
Solve in a : 
A 
ot the 
fom Enelis 
internal, which I consider doubtful, the cycle of their ana- 
| ot only to lower types, but have certain features in common 
oem 
-, Allman’s fresh-wat, 
the more highly organized dibranchiate Cephal 
two 
. p lOpo Ss, 
“en are but two known species of the order Ceriolites, both 
t 6 
: os Billings, in describing the species, states that they differ 
ts ki bf 
'n the external ornaments or mar ings. 
er Polyzoa. Ray Soc., 1856, p.55 
, 18 . 55. 
a indebted to Prof. J. D. Dana for the loan 
of tome fragment above i have been inde a 
eport, Canada Geol. Survey. 1853-56. p. 343, 
