PLATE LI. 
Goncavum-zone. 
Figs. 1 — 10. — Haplopleurooeras subspinatum, S. Buclcman. 
Fig. 1. — Side view of a specimen with strong spines in the umbilicus. This 
is the original specimen which was figured in the ' Proc. Dorset Field Club,' as 
" AmaWieus sit,hspinatus.^' Halfway House, Compton, Dorset. My Collection. 
(Page 300.) 
Fig. 2. — Front view of the same specimen. 
Fig. 3. — Part of the suture-Hne of the same specimen showing siphonal and 
superior lateral lobes. 
Fig. 4. — Side view of an immature form with distant ribs. Bradford Abbas. 
My Collection. (See also PI. XLIX, figs. 5, 6.) 
Fig. 5. — Front view of the same specimen showing the thick whorls. 
Fig. 6. — Side view of an example of which the inner whorls have more regu- 
lar and more numerous ribs, whereon the spines are but little developed. The 
last part of the whorl of this specimen was figured in the ' Proc. Dorset Field 
Club,' as showing the mouth-border ; but I do not feel sure that that conclusion 
was correct — the body-chamber seems so short. Bradford Abbas. From my 
father's Collection. 
Fig. 7.— Suture-line of another specimen; the superior lateral lobe has a 
marked ventral twist. Bradford Abbas, My Collection. 
. Fig. 8. — Side view of a close-ribbed form. Bradford Abbas. My Collection. 
Fig. 9. — Back view of the same specimen showing obsolescent furrows on the 
ventral area. 
Fig. 10. — Portion of the ventral area of the same specimen enlarged, showing 
attempted crenulation of the carina. 
Figs. 11, 12. — Haplopleueoceras munuum, S. Buchnan. 
Fig. 11. — Side view of an example showing the broad whorls and numerous 
fine ribs. (By an oversight on my part the specimen is represented reversed ; that 
is to say, it is the ornamentation of the right-hand side which has been depicted 
in the plate.) Bradford Abbas. From my father's Collection. (Page 302.) 
Fig. 12. — Front view of the same specimen showing the compressed whorls. 
Figs. 13 — 15. — An ahnormal form. 
Fig. 13. — Side view of an individual of HapJopleuroceras, probably H. sub- 
spinaium, which has suffered injury. Bradford Abbas, Dorset. From the collec- 
tion of Mr. Darell Stephens, F.G-.S. (Page 301.) 
Fig. 14. — View of the other side, showing the injury which happened at about 
the commencement of the last whorl. 
Fig. 15. — Back view of the same specimen, showing that the result of the 
injury has been to cause the carina and sulci to disappear, and the ribs to cross 
the ventral area. It may be noted in the other figures that the injury caused the 
spines to disappear. 
