L. RICHARDSON AND J. W. TUTCHER : PTEROMYA CROWCOMBEIA 55 
under the name of " Modiola minima Moore." Through the kindness 
€f the Rev. H. H. Winwood, of Bath, we have been able to examine 
the specimen from the Flinty Bed " of Beer Crowcombe fiuured by 
Moore as Modiola >niini)ia Sowerby."* Under this name Moore also 
recorded the form from the Langport Beds, which we have named 
" Volsella langportensis.'' The specimens from neither the Flinty 
Bed " nor the Langport Beds, however, are Volsella niinhna (J. 
Sowerby) . 
The form that we have selected as the type of Volsella langport- 
ensis is that which is most individually numerous. Certain variations, 
however, occur. The commonest vaiiety in the Langport Beds is a 
narrower shell — var. augustiforinis {vide supra), a less common one is 
a straigliter shell — var. erecta {vide supra). 
VOLSELLA LIASINA (tERQUEm). 
Plate IX., fig. 6. 
1855. Terquem, Palceont. Liasique Luxem., p. 312, plate xxi., fig. 9. 
Remarks. — We have collected several examples of this species 
from the lower portion of the Angidata-Beds (hemera warmorerp) in 
the Bristol district. 
volsella minima (j. sowerby). 
Plate IX., figs. 2 and 3. 
1818. Mineral Conchology, Vol. III., p. 19, plate 210, figs. 5-7. 
Remarks. — This name has been somewhat indiscriminately 
applied. Sowerby has figured three specimens, two extremely small 
(plate 210, figs. 6 and 7), and one larger (fig. 5), which represents about 
the average size of the mature specimen. This last may be selected 
as the type. It was sent to Sowerby " from Taunton." It may have 
been obtained from the neighbourhood of West Hatch, where specimens 
identical with that figured by Sowerby (fig. 5) are very common in 
the basal portion of the Pleuromya-'Beds. 
We do not recollect having found typical specimens of Volsella 
minima (J. Sowerby) outside the Pleuromya-Beds. 
Specimens have been procured wherever the Pleuromya-Beds are 
exposed. 
* Quart. Journ. Geol. Soc, Vol. XVII. (1861), p. 505, pi. xv., figs. 
26 and 27. 
