Bracluopod Nomenclature. 225 



Sowerby Collection (British Museum, Natural History) under 

 No. 43464 are four specimens — one in one box, three in 

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

 of Ano77iites crumena, Martin (Petrif. Derb. pi. 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 costte. In the pedicle-valve of this blackish speci- 

 men 1 cannot find any mesial septum. It has the appearance 

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

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

 p. 190). 



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

 original of the example of T. crumena figured by Sowerby 

 in fig. 3 of pi. 83. This and another specimen in tlie 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 Marlstone and are the 

 well-known Rhi/nchonella 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 

 hitherto have been designated by tlie above term, form a 

 remarkable group ; but their identification witli Terehratula 

 glohdta is erroneous. It is necessary to revise. 



Terehratula glohata, J. de C. Sowerby. 

 1823. Min. ConcL. pi. 436. fig. 1. 



An examination of the types of the species shows tliat the 

 identification usually made, on the lines of tlie 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, ahnost uiiiplicate, barely bipiicate siiell, 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 not T. hullata. These two species are remarkably 

 alike : they are isochronous homoeomorphs — members of two 



P 



* "CatalOjTue of Tvpe Specimens,'' JJull. U.S. Xal. Miis. vol. liii. 



i-irieoo). 



. l--) (1905 



