Brach'iopod Nomenclature. 225 



Rovvorby Collection (British Museum, Natural History) under 

 No. 43464 arc four specimens — one in one box, tliree in 

 another. The one alone is said to be tlie figured specimen 

 0^ Anomiies crumena, Martin (Petrif. Derb. pl.xxxvi. fig. 4) ; 

 but Martin's figure is coloured light ochre, while this is a 

 blackish-grey fossil of much smaller size and with less 

 marked costoe. In the pedicle-valve of this blackish speci- 

 men I cannot find any mesial septum. It has the appearance 

 of a Lower Lias Rhynchonella^ and it is possibly the example 

 mentioned by Sowerby as from Pickeridge (Min. Conch, i. 

 p. 190). 



Of the three specimens in a box, one is claimed as the 

 original of tlie example of T. crumena figured by Sowerby 

 in fig. 3 of pi. 83. This and another specimen in the box 

 may both have supplied details of what is perhaps a com- 

 posite figure — what Schuchert calls a synthetograph *. But 

 these three specimens are not from Mountain Limestone as 

 claimed : they are from Middle Lias ]\[arlstone and are the 

 well-known Rhynchonella northamptonensis^ Walker. David- 

 son's Ool. & Lias. Brach., Suppl. pi. xxix. fig. 8, represents 

 them exactly. 



The T.-globata series. 



The Inferior -Oolite and Fuller's- Earth species, which 

 liitherto have been designated by the above term, form a 

 remarkable group ; but their identification with Terehratula 

 fjlohata is erroneous. It is necessary to revise. 



Terehratula glohata, J. de C. Sowerby. 

 1823. Min. Concb. pi. 436. fig. 1. 



An examination of the types of the species shows that the 

 identification usually made, on the lines of the specimen 

 figured as T. glohata by Davidson in Ool. & Lias. Brach., 

 Suppl. pi. xvii. 3, is quite incorrect. Sowerby's species is 

 a very globose, almost uniplicate, barely biplicate shell, not 

 at all well depicted by Davidson, Ool. Brach. pi. xiii. 2, 3. 

 Sowerby's species is the shell which the late J. F. Walker 

 has for years distinguished and distributed by the MS. name 

 of a village near Frome : that will be a guide to its identifi- 

 cation in many cases. 



I suspect that Dav. Suppl. pi. xvii. 5 is really T. glohata 

 and nf)t T. hullata. These two species are remarkably 

 alike : they are isochronous homoeoraorphs — members of two 



•^ " C'atiil<viie of Tvpe Specimens," Bull. I'.S. Nat. Mas. vi>l. liij. 

 p. l.-)(lUOo). 



