52 PROCEEDINGS COTTESWOLD CLUB 1912 



It is a very neat form and almost suggests the use of 

 the term " globular " wherewith to describe it. This feature 

 distinguishes it at once from Rhyn. hampenensis, S. Buckman, 

 which is more transverse. 



RHYNCHONELLA SUBDECORATA, Davidson 



T.f. 1851-2. Davidson, Monogr. Brit. Oolitic and 

 Liassic Brachiopoda. PI. XVIII., fig. 10, and Appendix, 

 PL, A., figs. 23 and 25. 



T.l. " Birdlip Hill, Gloucestershire." 



Hor. " Inferior Oolite." [SmsMw-Beds. r). Scissi.] 



Colin. PI. A, figs, 23 and 25 ; British Museum [Davidson 

 Colin., Reg. No., B. 5558].' 



Remarks. — Several forms have hitherto been grouped 

 under the name " Rhynchonella subdecorata, Davidson," one 

 of which is now named "Rhynchonella cheUensis" (see 

 page 50.) 



The first specimen that came into his hands, Davidson 

 figured as " a most remarkable variation of Rhvn. tetrahcdra, 

 approaching to Rhyn. dccorata and said to be from the Inferior- 

 Oohte of Cheltenham " (explanation to pi. XVIII., fig. 10, 

 of his Monograph). In Plate A of the Appendix to this vol. I. 

 of his Monograph, Davidson names the form " Rhynchonella 

 subdecorata " and figures specimens from the Inferior Oolite, 

 Birdlip Hill, Gloucestershire ; " a series of ages and varieties, 

 figs. 23 to 26." Of these figures 23 and 25 accurately picture 

 a fossil that is not at all infrequent in the 5cissw7«-Beds of 

 the Cotteswold Hills, and it is highly probable that Davidson's 

 specimens from Birdlip came from the same horizon.'' 



Specimens of the true Rhyn. subdecorata, Dav., have been 

 obtained from the Scissum-Beds of Oxenton, Birdlip, Cooper's 

 and Nottingham Hills — all near Cheltenham. 



1. The specimen ligurcd in pi. .wiii., fig. 10, is said by Davidson to be iu ihe Walton 

 Collection, but Mr R. B. Newton informs us that it is not in the British Museum (Nat. Hist.). 



2. Figs. 24 and 26 represent a smaller form which is found at the top of the Lower Lime- 

 stone near its junction with the Tea-Grit, especially at Cud Hill, near Painswick, and is not the 

 young stage of Rhynchonella subdecorata as here depicted. 



