446 On Brachiopod yomenclature. ■ 



overlooked the fact that tliere is a still earlier name which 

 was properly applied to the Crag Terehratulce — that of Tere- 

 hratula spondt/lodes, given, with a description, by William 

 Smith * in 1817. His remarks may be reproduced here : — 



" Crag, Inequivalved Bivalves. 



" Terehratida spondylodes. 



" Oval, rather depressed, with sharp transverse lines of 

 growth ; a large circular foramen in the beak; two projecting 

 thick teeth in the lower valve ; shell thin, depressed on each 

 side of the beak. 



" [p. 13] Foxhole. 

 Newborn. 

 Aldborough, an upper valve ? 



" The large perforation in the beak is grooved circularly, 

 and also the recess beneath the beak, shell thin except at the 

 teeth of the hinge.-" 



Smith gave no figures, but he evidently had various 

 specimens of Crag Terehratulce before him ; and as they 

 formed part of the collection of the British Museum, it may 

 reasonably be expected that Smith's types of T. spondylodes 

 are in the safe custody of that institution now. Apart from 

 that, however, the description, with the formation and the 

 localities, fully indicate in a general way what Terebratula 

 was named. 



If all the Crag Terebratuloe be regarded as one species, then 

 Smith-'s name has priority, and it is the one to apply to these 

 fossils ; but if they be regarded as forms deserving of separate 

 names, then Smith's name is applicable to one of the forms. 

 There are two characters in his description which suggest 

 that the form called no. 1 above should have Smith's name — 

 that the shape is oval and that the shell is thin. No. 1 is 

 oval and the shell is thin ; in the other forms the shell is a 

 good deal thickened. 



The next name is Terehratida iierforata, Defrance, 1825. 

 Dale's figures, on which it is founded, are not good ; they 

 show two views of a damaged ventral valve. This form 

 seems to be intermediate in breadth between nos. 2 and 3, 

 and it appears to be the same as the broad form figured by 

 J. de C. Sowerby as T. variahilis'\. 



The next name is T. variahilis, J. de C. Sowerby, 1827, 



* ' Stratigraphical System of Organized Fossils, with reference to the 

 Specimens of the original Geological Collection in the British Museum ' 

 (1817), p. 12. 



t Min. Conch, pi. 576. iig. 4 (1827). 



