PLATE XXVIII. 



N.B. — All figures, except figs. 16, 17 b, and 18 b, are from pencil drawings. 



Fig. 

 la, lb, 1 c. Neritopsis varicosa, Morris and Lycett. Oolite Marl, Nailsworth. My Collection 



(Wright). Front, back, and apical X 2. (Page 341.) 

 2. Neritopsis incisa, sp. nov. Base of Lincolnshire Limestone, Swan's Brickyard, Lincoln. My 



Collection. Back x 2. (Page 342.) 

 3a, 3b, 3c. Neritopsis cf. Heberlana, d'Orbigny. Stoford. My Collection. Back, front, and 



apical x 2. (Page 343.) 

 4. Neritopsis cf. sulcosa, d'Archiac, or ? a modified form of N. Philea, d'Orb. Pea-grit, Crickley. 



My Collection. Back x 2. (Page 344.) 

 5a, 5 b, 5 c. Neritopsis cf. decussata, Minister. Base-bed, Lincoln. Back, front, and apical 



x 2. (Page 342.) 

 6 a, 6 5. Nerita costulata, Deshayes (Nerita costata, Sow.). Variety from the Scarborough 



Limestone, White Nab. Herries Collection. Back and apical x 2. (Page 332.) 

 7, 8, 9. Nerita pseudocostata, d'Orbigny. Dogger, Blue Wyke. Leckenby Collection. Three 



specimens showing different aspects, each x 2. (Page 333.) 

 10. " Neritopsis laevigata.'" Dogger, Blue Wyke. Jermyn Street Museum. Front x 2. 



(Page 344.) 

 11a, lib. Nerita (Neridomus) near to ovata, B-omer (cf. also Neritina Cooksonii, Deslongchamps). 



Pea-grit, Crickley. My Collection. Front and back x 2. 11 c. Portion further 



enlarged to show colour markings. (Page 336.) 



12 a, 12b. Nerita (Neridomus) tumidula, Phillips. Dogger, Blue Wyke. My Collection. Frout and 



back x 2. (Page 335.) 



13 a, 13 J. Pileolus plicatus, Sowerby, var. A. Base-bed, Lincoln. My Collection. Apical and side 



x 3. (Page 337.) 



14 a, 14 6, 14c. Pileolus plicatus, Sow., var. B. Same locality and Collection. Apical, side and 



base x 3. (Page 337.) 



15 a, 15 b, 15 c. Pileolus Isevis, Sowerby. Inferior Oolite variety. Same locality and Collection. 



Apical, side and base x 3. (Page 338.) 

 16. Section of Pileolus to show the columellar septum. Base of Lincolnshire Limestone, Lincoln. 

 My Collection. Section x 3. (Page 337.) 



17 a, 17 J. Crossostoma cf. Prattii, Morris and Lycett. ? Irony Nodule-bed, Burton Bradstock. My 



Collection. Front and back x If. (Page 346.) 



18 a, 18 6. Ataphrus cf. lucidus, Thorent. Freestones of the Oolite Marl horizon, Nailsworth Hill. 



My Collection. Front and back x If. (Page 348.) 



