TRIGONIA nodosa. 
TAB. DVII.—/fg. 1. 
Spec. Cuar. Obovate, depressed ; anterior part 
covered with rows of large knobs, a portion of 
the posterior part plain ; superior edge straight. 
e514 as 
A warce rather depressed species: two or three rows 
of slightly elevated tubercles extend from the beaks to- 
wards the posterior margin, which is truncated irregu- 
larly : from that row of tubercles which passes over the 
disk, 8 or 10 others extend obliquely over the whole of 
the anterior portion. Much resembling T. dedalea 
(M. C. 88.) ; but it is larger, and the tubercles are less 
numerous, and do not cover the posterior portion. Casts 
of the insides have been preserved in Mr. Sowerby’s 
Museum since 1815: they were foundin the Green-sand 
at Hythe in Kent. 
