Fras. 
6. 
al 
PLATE XXIV. 
Spondylus spinosus (Sow.) (continued). (P. 127.) 
Upper part of M. cor-anguinum zone, Mitcheldever. Dr. Blackmore’s Col- 
lection. a, left valve; b, posterior view. 
M. cor-anguinum zone, Fletcher’s pit, Gravesend. Woodwardian Museum. 
Small portion of left valve near the middle of the ventral border x 3. 
M. cor-anguinum zone, Hungry Down, Blandford. Woodwardian Museum 
(Coll. Mr. Jukes-Browne). Left valve, umbo slightly imperfect. 
Lower part of Marsupites zone, Witherington. Dr. Blackmore’s Collection. 
a, left valve; b, section of ribs of the same near the mid-ventral border 
se 
Same horizon, locality, and collection. a, left valve; b, section of ribs of left 
valve near the mid-ventral border x 2; c¢, posterior outline. 
Marsupites zone, Margate. Dr. Rowe’s Collection. a, right valve; 6, section 
of ribs of right valve near the mid-ventral border x 2; c, posterior 
outline; d, umbo of left valve x 5. 
A. quadratus zone, West Harnham, Salisbury. Dr. Blackmore’s Collection. 
Left valve. 
