OF THE PUEBECK FOKMATION. 313 



4. " Cypris striatopmictata,^' fig. 371, a, 



5. " fasciculata," fig. 371, b, 



6. " granulata,'' fig. 371, c, 



are referred to the " Middle Purbecks ;" and 



7. " Cypris purheckensis^'^ fig. 375, a, 



8. " punctata, ''' fig. 375, 6, 



are referred to the " Lower Purbecks." 



All of these species, except (jranulata* (fig. 371, c), were referred 

 to " E. Forbes " by Lyell ; presumably, however, tuherculata is after 

 Sowerby, and striatopunctata was named probably after Romer, but 

 erroneously. The woodcuts, and the remaining few of the diagrams 

 from which they were probably reduced, are very unsatisfactory 

 illustrations of these Ostracods, several essential features not being 

 shown in the oblique and clumsy drawings ; and in some cases pro- 

 bably waterworn or weathered specimens have been taken for types. 

 This is especially noted in Proc. Geol. Assoc, vol. viii. 1883, p. 58, 

 as regards fig. 375, a, which is comparable with only one indi- 

 vidual on the slab of Purbeck limestone, Xb^, in the Museum of 

 Practical Geology, probably examined by E. Porbes, and that is a 

 waterworn or weathered little " specimen, in which the valve lying 

 uppermost has been worn or dissolved away by water so far as to 

 leave the edge of the underlying valve exposed all round it, and like 

 a marginal rim belonging to it." 



Of the foregoing list, No. 1 is not readily recognizable, and is not 

 noticed in the MS. note of July 23, 1854 (hereafter mentioned) ; 

 but it is probably a variety of -punctata, and, like that, most common 

 in the upper part of the series. To this conclusion, Eorbes's letter 

 to ]\lr. Bristow (July 18, 1851) and the study of punctata and its 

 variations easily lead me, having in view a large series of Purbeck 

 specimens. No. 2 is met with rarely in the Middle and Upper 

 stages of the Purbeck formation. JSTo. 3 is easily recognized in the 

 Middle, and occurs also in the Upper beds. 



No. 4. The form here intended is rare ; it is better figured in the 

 sketch in the letter to Mr. Bristow. It is found in the Middle 

 Purbeck. No. 5 is very characteristic of the Middle Purbeck (as is 

 also noted by E. Forbes, and known to the Bev. 0. Fisher and Mr. 

 W. Cunnington), both by its abundance there and its absence from 

 the other divisions of the series. No. 6. This, if intended for the 

 granulosa of Sowerby, is not that species. Most probably it is the 

 granulosa of Bomer and Dunker, which is rare (as BunTceri, see 

 p. 339) in the Middle and Upper Purbecks. 



No. 7 is the characteristic Lower- Purbeck form; and, although 

 badly drawn in fig. 375, a, it is well known to the Bev. 0. Fisher 

 and Mr. W. Cunnington by direct information from E. Forbes, and 

 is plainly indicated in his letter to Mr. Bristow. No. 8 is different 

 from any Lower-Purbeckt species, and, indeed, is recognizable as an 



* Referred to " Sowerby." It is not, however, the granulosa of Sowerby, 

 but is rather the granulosa of Romer and Dunker, which I now term DimTceri. 



t Although this form occurs in the so-called " Lower Purbeck " of Swindon, 

 we must remember that the whole of the series (Upper, Middle, and Lower) 

 is represented there. (See further on, p. 331.) 



