deep angular notches, which are filled by as many sharp 
teeth on the edge of the other valve, which is not so much 
plaited and is altogether flatter. The length of the edge 
between the central plaits and the lateral ones is remarkable. 
This is found in the Limestone rock near Dublin, and in 
the Black rock near Cork. The stone is generally a com- 
pact darkish marble, foetid when scraped. I have had 
specimens from Messrs. Moore of Dublin, and Dr. Wood 
and Mr. Wright of Cork. A similar species is found at 
Avnhoe, Northamptonshire, in a marly stratum. 
TEREBR ATU L A crumena, 
TAB. LXXXIII. — Figs . 2% and 3. 
Spec. Char. Deltoid, gibbous, plaited; middle of 
the front elevated with three long plaits ; sides 
with four or more plaits below the middle; 
beak prominent. 
Syn. Anomites crumena. Jllartyn Petr. Derh . 
Tab. 13. f. 4. 
This species is distinguished from the last by its deltoid 
form, and the plaits extending nearly to the beak. 
Mr. Martyn long since sent me this from Winster, it is 
composed of grey Limestone. I have also casts in ferru- 
ginous Sandstone, of what I suppose to be the same species, 
from the banks of the Tees, by favour of the Rev. Mr. 
Ilarriman; they are represented, fig. 2 and 2*. Pickeridge 
has afforded Miss E. Hill the same species. 
