Figs. 17-24.-—Hyolithus primeevus, sp. nov. 
18. . YS. .°¢ x12 diam.) 
ee 
7. (XS diam.) 
OT aa 
i 
} 
| 
i. 
/ 
(x6 diam.) 
Fig. 17.-Dorsal view of a specimen, part of the shell of which is preserved. 
From the Hollybush Sandstone (M 448). 
18.— Transverse section of the same. 
Figs. 19 & 20.—Cross-sections of two other individuals from the same locality. 
Fig. 21.—Dorsal view of an internal cast. From the Malvern Quartzite 
(M 244c); figs. 22 & 23, transverse sections of the same, taken at 
the broad and narrow ends respectively. 
24.—A second internal cast from the same locality. 
