% 
OF 
versing the joints, without grooves; articulations of 
the side lobes being manifest continuations of those of 
the middle lobe, and consequently, agreeing in num- 
ber. 
BRoNGNIATIA PLATYCEPHALA. Eaton. 
@ 
Head and fore abdomen very broad and depressed, 
the abdomen with ten joints curved forwards at the 
undulations$ post abdomen and tail with about fif- 
teen joints curved backwards at the undulations; the 
three lobes of the tail more distinctly separated; divi- 
sions between the joints of the abdomen double. 
The representation of B. platicephala, figure 20 
plate 2, of the Geological Text Book, i 
bits it be accu- 
rately drawn, is certainly of a trio bitag> ever hetane 
described. On the buckler, which is without eye: 
there is delineated a sient not unlike some of the | 
leaves of the mulberry tree. | 
The tail is also very peculiar. In Silliman’s Jour- 
nal, Volume 21st, page 136, ne | Eaton pro- 
posed for this curious fossil the temporary name of 
Ogygies latissimus. “It is found, he observes, in the 
upper soft slaty variety of the rock which has been 
so successfully used for the lias cement at Chitteningo, 
&c. Dr Smith, of me (N. Y.) sent me two 
specimens, taken from a continuation of the Chitten- 
ingo lias rock, immediately beneath the geodiferous 
lime rock on which the cherty (cornitiferous) re- 
poses.” The whole animal is six inches long, and 
three broad. + | 
4 m 
: | 
2 Se 
te } ¥ 
