VOL. Xv. (2) C. UPTON—BRACHIOPODA 87 
T. Wrightt Dav., but a person moderately well acquainted 
with the Jurassic Brachiopoda would not, I think, con- 
found 7. degenerata with any of them. 
4. AULACOTHYRIS ALVEATA, Quenstedt. ? 
PALL figs: F4——19. 
1871. TEREBRATULA CARINATA ALVEATA, Quenstedt. 
Die. Brach. p. 349, pl. xlvii., figs. 47—50. 
In the upper portion of the Lower Limestone (belonging 
to the Pea-Grit series) there occurs somewhat sparingly a 
form of Waldheimia ( Aulacothyris) which does not appear 
to have been noticed by Dr Davidson. The shell is a very 
striking one, strongly resembling the well-known 4. carz- 
nata of the Ragstones. The brachial valve has a broad and 
deep furrow throughout its length, and the pedicle valve is 
strongly carinate. Mr Buckman suggests that it may be 
the same shell as that which Quenstedt figures and de- 
scribes as Zer. carinata alveata in the work above referred 
to, and I accept that identification ; but in accordance with 
the modern system of nomenclature the specific name 
“alveata” can alone be retained. The generic name also 
must be abandoned, as the fossil does not belong to the 
group now distinguished by the name Zerebratula. It 
has been recorded by Mr Richardson from the Pea-Grit,* 
and I have obtained specimens from Kimsbury Castle 
(Painswick Hill), Crickley and Leckhampton Hills. 
The shell is probably a development of the small, almost 
circular Audlacothyris Blaket, Walker, which occurs in the 
Opatinum-Zone: indeed, young specimens of A. alveata 
are scarcely distinguishable from 4. Blakez.’ 
The specimens figured are from the upper portion 
of the Lower Limestone of Crickley Hill. 
1 “ Handbook Geol. Cheltenham” (1904), p. 243. 
2 Specimens of 4. Blakei sometimes occur much larger than those figured by 
Dr Davidson, which are immature. 
