8 
CUCULLABA decussata. 
TAB. CCVL—Figs. 3 and 4 , 
Syn. Cucullsea decussata. Parkinson III. 171. 
Spec. Char. Transversely ovate; gibbose, with 
flattish longitudinal ridges ; anterior side an- 
gular ; lines beneath the cartilage few. 
About one-fifth wider than long : the ridges are but 
little elevated, and are decussated by fine and close lines 
of growth : the interior margin in old shells is crenu- 
lated : the teeth of the hinge, when they are not worn, 
are striated or crenulated upon their sides, as I have ob- 
served when speaking of C. glabra, (Vol. I. p. 152, t 67.) 
I received this from the same gentleman who sent Mr. 
Parkinson the specimens he describes, Mr. Francis Crow, 
who collected them all near Faversham, in Kent : they 
are silicious casts, with a small portion of the shell re- 
maining. 
