316 PEOP, T. E. JOITES OX THE OSTEACODA 



pi. 485, and the figure is very characteristic of a Cijpridea common 

 in the AVeald Clay, as mentioned by Sowerby. This same species 

 was referred to, and named Cypns valdensis, by Dr. Fitton in the 

 Trans. Geol. Soc. ser. 2, vol. iv. 1836, pp. 177, 205, & 228, and 

 by Sowerby at p. 3-14 ; but unfortunately another form was con- 

 fused with it and figured (]3l. 21. fig. 1) instead of it. "Whether 

 this other species was obtained from the Wealden or from the Pur- 

 beck beds is not evident from the memoir. At pp. 229 & 260 

 C. ojoldensis is also referred to as occurring in the Purbeck beds ; 

 but, in the first place, I did not meet with it, after long and careful 

 search in that formation, until lately, when it turned up, quite rare, 

 in one thin bed of the Middle Purbeck at Eidgway; and, secondly, 

 hand-specimens* collected by Dr. Pitt on and marked " C. faha " 

 (which was at that time regarded as the same) really contain 

 C. pirrhecJcensis, and not C. vcddeasis. Pitton's fig. 1 comprises five 

 sketches, namely : — (1) a piece of black shale crowded with Cyprids ; 

 (2) an individual of the natural size ; and (3) three views of a spe- 

 cimen quite different from the real C. valdensis. Believing that I 

 found some specimens like the fig. 1 above mentioned in the Weald 

 Clay of Peasemarsh, Surrey, and in the Ironstone of Shotover, I 

 separated this form as Cypridea Austeni in 1878 (Geol. Mag. dec. 2, 

 vol. V. pp. 110, 277). 



Pitton's fig. 2 (pi. 21) comprises two species under one name : — 

 h and c are Cypridea tuhercidata (Sowerby, in Pitton's memoir), and 

 a is C. Fittoni (^lanteU), both from the TTeald Clay (pp. 177, 205, 

 228, & 345). Pig. 3 is Cypridea spinigera (Sowerby), from the 

 "Weald Clay (p. 345). Pig. 4, termed " Cypris granulosa " by 

 Pitton and Sowerby (pp. 177, 260, and 345), is an important 

 species, one of the modifications of which is the Cypridea fasciculata 

 (Forbes), very common in the Middle-Purbeck beds. The little 

 Cypridiferous light-coloured block figured resembles a bit of the 

 common soft whitish Purbeck limestone, or calcareous shale, often 

 fuU of C. fasciculata ; and the two views of the bivalved carapace 

 show the surface to be, as usual, nearly bare of tubercles about the 

 middle region. The notcTi was missed by the artist, and the outline 

 not quite accurately given. This species is quoted, at p. 177, from 

 the '• ferruginous sand, Tilgate Porest " (ManteH's Collection) ; but 

 of this locality for it I have no certainty, and, indeed, C. tubercidata 

 was probably mistaken for granulosa, as was decidedly the case 

 with a specimen collected by Dr. Mantell, and now in the British 

 Museum. The localities given at p. 260 — "between Dallard's 

 Parm and Catherine Pord " and at " Dashlet, between Penthurst 

 and Teffont" — are doubtlessly true for this species. 



The figures given by Sowerby for Pitton's memoir approach very 

 closely C. fasciculata (E. Porbes), as intimated above ; and, indeed, 

 Porbes (in the letter to Mr. Bristow) refers his fasciculata with 

 some doubt to C. granulosa (meaning, no doubt, Sowerby's species, 

 though the sketch does not agree vnth it) as a variety of that 

 species. Forbes' s/ffScicwZa to does not occur in the Wealden beds; 

 * Such as those referred to at pp. 259, 260, of Pitton's memoir. 



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