VOL. XVIII. (i) SOME INFERIOR-OOLITE BRACHIOPODA 49 



RHYNCHONELLA AURICULIFERA, sp. nov. PL VII., 

 figs. I3fl, b, 14a and h. 



T.l. Crickley Hill, near Gloucester. 

 Hor. Pea-Grit. r). Murchisona. 

 Colin. L. Richardson. 



Description. — Shell small, the brachial valve being noticeably flattened 

 in the umbonal region. The mesial fold has usually three ribs on the upper 

 side, while the lateral areas have each of them three conspicuous and three 

 inconspicuous ribs. The beak is well projecting, and acute and more incurved 

 immature than in immature specimens. Peltidial plates prominent, almost 

 surrounding the foramen, with lateral calcareous growths resembling two 

 ear-like projections. 



Remarks. — The type-specimen came from the Pea-Grit 

 of Crickley Hill, where numerous examples are to be obtained 

 along a certain horizon. The holotype, however, is a par- 

 ticularly large specimen. Frequently more aged-looking 

 examples are to be found which are considerably smaller 

 and appear to be mature forms dwarfed. Specimens have 

 been obtained from the Pea-Grit at Birdlip and Selsley Hill, 

 near Stroud. It is common also in the Coral-Bed on top of 

 the Pea-Grit at Juniper Hill, near Stroud. 



The fossil figured in Plate VII., figs. 14a and b is from 

 the Scissum-Beds of Haresfield Beacon, near Gloucester. 

 It has only two ribs on the mesial fold, is narrower and more 

 coarsely ribbed than the form from the Pea-Grit. 



In the OoUte Marl of Westington Hill, near Chipping 

 Campden, specimens of a rhynchonellid, which are considered 

 to belong to the present species, are very abundant. The 

 majority of the specimens collected are immature, are flatter, 

 and have a more horizontally-projecting beak. The few 

 mature forms that have been obtained, have more incurved 

 beaks, one specimen is biplicate and similar to that from 

 the Scissum-Beds of Haresfield, so that for the present, the 

 specimens from the three horizons are associated under the 

 same specific name. 

 E 



