THE BRITISH FOSSIL BRACHIOPODA. 275 



37. Rhynchonella Gingensis, Waagen. Dav., Appendix to Supplements, Vol. V, PL 



XX, figs. 1, 1 a. 



Rhynchonella Gingensis, Waagen. Geognostisch-palaont. Beitrage, pi. 32, fig. 3, 



1867. 

 — — S. S. Buckman. Proc. Dorset Nat. Hist. Club, vol. iv, 



p. 45, 1882. 



Shell obscurely subpentagonal, somewhat broader than long, widest about the middle. 

 Dorsal valve gibbous and divided into three lobes, the central one forming a rounded 

 mesial fold. Ventral valve less convex than the opposite one, with a broad, flattened 

 mesial sinus ; beak small, incurved with a circular foramen under its angular extremity, 

 and lying close to the umbo of dorsal valve, lateral portions of the beak and umbo bent 

 inwards at acute angles. Surface of each valve ornamented with about twenty angular 

 ribs of which five or six occur on the fold, four or five in the sinus. 

 Length 16, breadth 17, depth 13 lines. 



Obs. — In his notice of this Bhgnchonella at p. 45 of his paper on the 'Brachiopoda 

 from the Dorset Inferior Oolite,' Mr. S. S. Buckman says that it is " a species which is 

 closely allied to RJiyn. subtetrahedra, Dav., but it is much deeper, with a far more 

 convex dorsal valve, and is not nearly so broad." I quite agree with Mr. S. S. Buckman 

 in these remarks ; and it is very probably no more than a variation in shape of the species 

 I had named Bh. subtetrahedra. The British examples from the Inferior Oolite of 

 Bradford- Abbas in Dorset are larger than the one figured by Dr. Waagen, and it 

 is stated by Buckman that it occurs chiefly in the zone of Am. Murchisoni and less 

 seldom in that of Am. Sowerbgi. Dr. Waagen quotes it from Gingen (Wiirttemberg), 

 from many places in France, and from Gunsberg and Betzenan (Switzerland). 



38. Rhynchonella fallax, E. Desl. Dav., Appendix to Supplements, Vol. V, PI. XX, 



figs. 4, 4 a, b, and 5. 



Rhynchonella. fallax, E. Deslong champs. Etudes critiques sur des Brachiopodes 



nouveaux ou peu connus, p. 20, pi. iii, 

 figs. 1—5, Caen, 1862. 



Shell subpentagonal, wider than long. Dorsal valve moderately convex, somewhat 

 depressed, divided into three lobes, central lobe wider than the lateral ones, forming a 

 broad, flattened, mesial fold, with large lateral slopes, and ornamented by three or four 

 longitudinal angular ribs ; three or four ribs are present also on each of the lateral lobes. 



37 



