PLATE XXVII. 
N.B.—About half the figures are drawn from photographs, more or less enlarged. 
Fre. 
1a, 1b. Onustus pyramidatus, Phillips. Wide-angled variety with straight ribs. 
From (?) Murchisone-zone, Chideock. My Collection. Front and 
base x 13. (Page 326.) 
2a,2b6. The same. Specimen believed to be the type, Dogger; Blue Wyke. 
York Museum. Back and base x 14. 
3. Onustus acuminatus, sp. nov. Murchisone-zone, North Dorset. Whidborne 
Collection. Back x 14. (Page 328.) 
4a, 46. Onustus heliacus, d’Orb., var. opalina. Opalinus-zone, Drympton. My 
Collection. Front and base x 14. (Page 329.) 
5a, 56. Onustus ef. lamellosus, @Orbigny. (The base shows a deeply excavated 
umbilicus as in d’Orbigny’s figure, but the radial ornaments are 
wanting). Concavus-bed, Bradford Abbas. My Collection. Front 
and base X 13. (Page 328.) 
6a, 6b. Onustus Heberti, Laube. Stoford. ? Parkinsoni-zone. My Collection. 
Front and base X 2. (Page 329.) 
7. The same. Wide-angled variety, with the spirals in the base and the 
crenulations of the margin more strongly developed. Cadomensis-bed, 
Oborne. My Collection. Base x 2. 
8a, 8b. Onustus ornatissimus, d’Orbigny. Parkinsoni-zone, Burton Bradstock. 
My Collection. Front and base xX 14. (Page 330.) 
9a, 9b, 9¢. Neritopsis Bajocensis, @Orbigny.  Parkisoni-zone, Burton Brad- 
stock. My Collection (Stephens). Front, back, and apex x 15. 
(Page 340.) 
10. Operculum of Neritopsis Bajocensis, V’Orb. Humphriesianus-zone, Sherborne 
district. My Collection (Stephens). In position, natural size. 
lla, 116, lle. Neritopsis Philea, @Orbigny, Inferior Oolite variety. Concavus- 
bed, Bradford Abbas. My Collection. Front, back, and apex X 15. 
(Page 341.) 
