342 



PROP. T. E. JOIfES ON THE OSTEACODA 



Pord, with Cydas in slaty Purbeck stone ; also, with Cydas and 

 Modiola, in grey freshwater limestone. Dashlet, between Pent- 

 hurst and Teffont." 



In two mnltigranulate specimens from Teffont (No. 83) the " lucid 

 spots " ('• muscle-spots ") are visible, consisting of six suboblong 

 marks, three in a short, shghtly curved, transverse row, one lying 

 behind and across them, and two others separate, at a little distance 

 from the ends of the aforesaid row. 



This species is highly characteristic of the Middle-Purbeck beds, 

 both by its abundance and by its being peculiar to that division of 

 the series. 



Some forms of Cy^jvidea verrucosa^ Jones, 1878, were separated 

 from G. granulosa (Sow.) on account of the supposed absence of 

 the beak and notch in the latter ; but one of these (fig. 6, pi. iii., 

 Geol. Mag. 1878) is evidently the same as the granidosa (multi- 

 granulate) we have before us, and now know to have the notch. 



This essentially Mid-Purbeck species certainly occurs in the 

 Cypridif erous shales of Obernkirchen, Cassel, IS'orth Germany (speci- 

 mens in the British Museum), although it is not described nor 

 figured by Eomer and Dunker. It is of much interest, as support- 

 ing the late Dr. W. Bunker's opinion that the Hanoverian shales 

 are of Purbeck and not of Wealden age. 



6. Cypeidea ttjbeeculata (Sowerby); and var. adjui^cta, nov. (PL 

 YIII. figs. 22, 23, 24.) 



Cypris tuherculata, J. De C. Sow., in Eitton's Memoir, Trans. 

 Oeol. Soc. ser. 2, vol. iv. 1836, pp. 177, 205, 228, 345, 352, pi. 21, 

 fig. 2 (including another form, indicated in the description at p. 345, 

 and subsequently separated off as Cyjpris Fittoni by Mantell). 



Cypris tuhercidata, Lyell, Elements of Geology, 1838, p. 348, 

 fig. 186 (after Sowerby); 2nd edit. 1841, vol. i^p. 417, fig. 202; 

 Manual of Elementary Geology, 3rd edit. 1851, and 4th edit. 

 1852, have the same woodcuts as the foregoing; 5th edit. 1855, 

 p. 294, fig. 334 h (after E. Forbes) ; 6th edit. 1865, p. 378, fig. 



msh. 



Cypris tuberculata, Eomer, Yerst. nordd. Ool. 1839, p. 52, pi. 20. 

 fig. 23. 



Cypris tuhercidata, Mantell, Medals of Creation, 1st edit. 

 1844, vol. ii. p. 545, lign. 1819, figs. 3, 3a ; 2nd edit. (Jones), 

 1854, vol. ii. p. 527, lign. 174, figs. 3, 3« (fig. 2 is C. Fittoni, 

 ManteU, in both cases). 



Cypris tulerculata ?, Dunker Monogr. nordd. Weald. 1846, p. 60, 

 pi. 13. fig. 30. 



Cypris spinosa, Eorbes, MS., July 18, 1851; C. tuberculata?, 

 MS., July 23, 1854. 



Cypridea tuberculata, Morris, Catal. Brit. Eoss. 2nd edit. 1854, 

 p. 104. 



Cypridea tulerculata, H. Woodward, Catal. Brit. Eoss. Crust. 

 1877, p. 89. 



Length | millim. 



