PLATE XVII. 
Fia. 
la. Turritella Dorsetensis, sp. nov. Irony-nodule bed, Burton Bradstock. My 
Collection. 
1b. Variety of the same. Murchisonx-zone, Bradford Abbas. My Collection. 
le. Turritella Dorsetensis. Composite figure drawn from three specimens; the 
apical and anterior portions from the irony-nodule bed, Burton Brad- 
stock; median portion from the Murchisone-zone, Stoford. My 
Collection. (Page 228.) 
2a. Turritella (Mathilda) abbas, sp. nov. 2b. The same, apical condition. 
2c. Variety of the same. All from the concavus-bed, Bradford 
Abbas. My Collection. (Page 280.) 
3a. Turritella (Mathilda) opalina, Quenstedt. Concavus-bed, Bradford Abbas. 
36. Variety of the same, approaching var. canina. Murchisonex-zone, 
Stoford. Both in my Collection. (Page 231.) 
4, Turritella (Mathilda) opalina, var. canina, Hudleston. Dogger, Blue Wyke. 
British Museum. (Page 232.) 
5. Turritella (Mathilda) strangulata, sp. noy. Concavus-bed, Bradford Abbas. 
My Collection. (Page 233.) 
6. Turritella (Mathilda) quadrivittata, Phillips. Dogger, Blue Wyke. My Col- 
lection. (Page 233.) 
7. Turritella (Mathilda), cf. binaria, Héb. and Desl. Neighbourhood of Bea- 
minster. My Collection. (Page 234.) 
8.' Cerithinella cingenda, Sowerby. Dogger, Blue Wyke. British Museum. 
9. Pseudomelania procera, var. minor, Deslongchamps. Parkinsoni-zone, Burton 
Bradstock. My Collection. (Page 238.) 
#. Mathilda, ef. euglypha, Laube. Upper Lias, Heyford. Crick Collection. 
Magnified ; apex largely magnified. (Footnote, page 235.) 
N.B.—All other species figured in this plate are natural size, with one whorl 
enlarged. 
1 Possibly the type-specimen of Twrritella cingenda, Sow. Subsequently this was regarded as a 
Nerinxa (vide Hudleston, ‘ Geol. Mag.,’ dec. 3, vol. i (1884), p. 112, pl. iv, fig. 9). For an account 
of Oerithinella see p. 186 of the present work. 
