56 BRITISH OOLITIC AND LIASIC BRACHIOPODA. 



53. Terebratula spheroid alis, Sow. Plate XI, figs. 9, 19. 



Tekebbatula sph/Eroidaljs, Soio. 1825. Min. Con., vol. v, p. 49, tab. 435, fig. 3. 



— bullata, Sow. 1825. Min. Con., vol. v, p. 49, tab. 435, fig. 4. 



— — Deslong champs. 1837. Soc. Lin. de Normandie. 



— sph^roidalis, Deslongchamps. 1837. Soc. Lin. de Normandie. 



— bullata, Desk. 1836. Nouv. ed. des Animaux sans Vert, de Lamarck, 



vol. vii, p. 362. 



— — V. Buck. 1838. Mem. de la Soc. Geol. de France, vol. hi, l ere 



Serie, p. 195, pi. xviii, fig. 8. 



— — Zieten. 1832. Dei Verst. Wurttemberg, tab. xl, fig. 6. 



— SPHIEROIDALIS, Morris. 1843. Catalogue, p. 136. 



— bullata, Morris. 1843. Catalogue, p. 132. 



— — Bronn. 1849. Index Palseont., p. 1231 (but exclude all the 



other synonyms given). 



— sfh^koidalis, D'Orb. 1849. Prodrome, vol. i, p. 287. 



Diagnosis. Shell inequivalvecl, more or less circular and spheroidal; beak small, 

 much recurved, and truncated by a moderately-sized circular foramen, almost touching and 

 advancing on the umbo j lateral ridges indistinct ; margin lines of valves more or less 

 straight or curved, with or without a slightly sinuated front ; surface smooth and punctuated. 

 Loop short, attached simply to crura, and extending to about half the length of the valve ; 

 length 15, breadth 12, depth 12 lines. 



Obs. Prom the study I have made of the original types of Sow., I believe T. spharoi- 

 dalis and T. bullata both to belong to one species, and as T. sphceroidalis is the first 

 described, we have given it the preference ; but authors have not in general understood the 

 Sowerby type. Von Buch, while adopting T. bullata, places T. sphceroidalis as a synonym 

 of globata. Prof. Bronn and M. D'Orbigny have also erred on this subject by placing 

 T. bullata and spharoidalis as synonyms of T. Kleinii, Lamarck. T. spharoidalis (as I 

 understand the species) is a very variable shell, some of its varieties differing much from 

 the common shape, but inseparable in my opinion ; a few of these are illustrated in 

 Plate XI, showing it to be a more or less convex, globular, elongated, or flattened shell ; 

 figs. 9 and 19 are Sowerby's types drawn from the original specimens, the first T. spha- 

 roidalis, the second T. bullata ; it will also be seen from figs. 9, 10, 12, 13, 15, 16, 18, and 

 19, that the frontal margin line of valves is in some straight (fig. 9), in others forming 

 either a convex or concave curve (in figs. 10, 14, 16, &c), while in some differently 

 sinuated (figs. 12, 13), but not in general interrupting the regular convexity of the valves 

 in front. In some instances, nevertheless, as in fig. 19, two or more slightly produced 

 rounded costae proceed a little way from the front towards the umbo and beak ; leaving an 

 obscure furrow on each valve, but never as deeply biplicated as in T. globata ; this is an 

 exceptional character in the species under consideration. The internal loop is in all the 

 same, and we are much indebted to my friend M. Deslongchamps for having forwarded to 



