L. RICHARDSON AND .T. W. TUTCHER : PTEROMYA CROWCOMBEIA 57 
Fig. 6. - Piece of Pleuromya-Bed limestone with Pleuromya tatei to 
show the abundance in which specimens occur at this horizon. 
(Three-quarters nat. size.) 
Locality. — West Hatch, near Taunton, Somerset. 
Collection.— J. W. Tutcher. 
Plate IX. 
Fig. 1. — Volsella hillana (J. Sowerby). (See p. 53.) 
Horizon. — Pleuromya-Beds. Lower Lias. 
Locality. — Pickeridge Hill, near Taunton. 
Collection. — 1^. Richardson. 
Figs. 2 and 3. — Volsella minima (J. Sowerby). (See p. 55.) 
Horizon. — Pleuromya-Beds. Lower Lias. 
Locality. — (2, mature specimen) Aust Cliff, near Bristol ; (3, im- 
mature specimen) West Hatch, near Taunton. 
Collection.— J . W. Tutcher. 
Fig. 4. — Volsella wickesi sp. nov. (See p. 56.) 
Horizon. — Pleuromya-^eds. Low^er Lias. 
Locality. — Redland ("New Clifton"), Bristol. 
Collection. — J. W. Tutcher. 
Fig. 5. — Volsella laevis (J. Sowerby). (See p. 54.) 
Horizon. — Pleuromya-Beds. Lower Lias. 
Locality. — Redland C' New Clifton"), Bristol. 
Collection.— :5 . W. Tutcher. 
Fig. 6. — Volsella Hasina (Terquem). (See p. 55.) 
Horizon. — Angulata-Beds (hemera marmoreae). Lower Lias. 
Locality. — Winford (Somerset), near Bristol. 
Collection. — J. W. Tutcher. 
Figs. 7, 11a, and h. — Volsella langportensis sp. nov. (Nat. size.) 
(See p. 54.) 
Horizon. — Langport Beds. 
Locality. — (11a and h) Norton Down, near Stratton-on-the-Foss, 
near Radstock, Somerset ; (7) young specimen — Clan Down, 
near Radstock. 
Collection.— :^. W. Tutcher. 
Figs. 8a and 6.— Volsella hillanoides (Chapuis and Dewalque). (Nat. 
size.) (See p. 54.) 
Horizon. — Angulata-Beds (hemera marmoreae). Lower Lias. 
Locality. — Hobbs Wall, Farmborough (Somerset), near Bristol. 
Collection.— 3 . W. Tutcher. 
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