Fias. 
Oo 
“JI 
FAL ASI ET pox Nexen Ae 
PECTEN (continued). 
Pecten (Chlamys) eretosus, Defr. Upper Chalk. (P. 174.) 
A. quadratus zone, East Harnham. Dr. Blackmore’s Collection. a, right 
valve x 13; /, part at antero-ventral edge xX 4; ¢, antero-ventral part 
of left valve of the same specimen x 4. 
Same horizon, ete. wo, left valve; b, part just behind the mid-ventral edge 
<3: 
Same horizon, ete. a, left valve x 14; /, part at postero-ventral margin 
x 4. Fine concentric ridges cover almost the entire shell, but are not 
shown in the figure. Near the umbo the radial ribs are spiny. 
M. cor-anguinumn zone, Porton. Dr. Blackmore’s Collection. a, left valve; 
}, part just behind the mid-ventral margin x 3. 
Marsupites zone, Witherington. Dr. Blackmore’s Collection. Left valve. 
M. cor-anguinum zone, Gravesend. Mr. G. E. Dibley’s Collection. «, right 
valve, with interior of anterior /eff ear; ), part of mid-ventral third 
x 4 
Upper Chalk, Bromley. Wiltshire Collection. Right valve of specimen with 
coarse ribs. «, antero-yentral part; }, portion of same part X 3. 
Same horizon, ete. Part of mid-ventral third of left valve x 6. 
B. mucronata zone, Norwich. Norwich Museum, No. 2056. Part of left valve 
near the middle of the ventral edge Xx 4. 
A. quadiatus zone, Kast Harnham. Dr. Blackmore’s Collection. Part at the 
mid-ventral edge Xx 4. 
Upper Chalk, Charlton. Wiltshire Collection. Right valve of a specimen 
with the scaly spines large and well-preserved. Part near the ventral 
edge X 6. 
Upper Chalk, Trimingham. Mr. R. M. Brydone’s Collection. Right valve. 
Form with numerous slender ribs. Portion at the dorsal third x 6. 
