340 PEOP. T. E. JOJfES OX THE OSTEACODA 



4. Cypbidea tenteosa, sp. noY. (PL YIII. figs. 25, 26.) And var. 



GLOBOSA. 



Length 1 mm. 



Yalves thick and broad (high) : obovate. with one edge (ventral), 

 notched and less convex than the other ; broadest (highest) at the 

 anterior third ; back elliptically rounded, with some protuberance 

 at the anterior hinge, and a steep antero-dorsal slope. The ventral 

 region has its border slightly curved, oblique, fuller in front, and 

 broadly notched; and it is turned in suddenly so much as to 

 form a broad flat base, on which the carapace can stand upright. 

 The surface bears some irregularly placed coarse tubercles and 

 ridges, the latter being on the ventral region, and having a direction 

 in general parallel or conformable with the ventral and anterior 

 borders. The beak comprises the anterior curved ridge much more 

 definitely than shown in fig. 26. Edge-view subovate. 



C. ventrosa has a near ally in C. verrucosa, var. crassa, Jones 

 (Geol. Mag. 1878, p. 108, pi. 3. fig. 4), which should (I think) now 

 be regarded as a distinct species (C. verrucosa ; see page 320). 



In specimen 44 the typical C. ventrosa is accompanied by a 

 variety (glohosa) which is quite smooth, and in some cases almost 

 loses its ventral lateral projection, though retaining a strong 

 gibbosity. The flat ventral base in C. ventrosa reminds me of a 

 somewhat similar, but more regularly constructed feature in Noto- 

 dromas, Lilljeborg {^Cyprois, Zenker, and Newnliamia, King). 



G. ventrosa is found in the Middle Purbeck, together with its var. 

 gJohosa ; and it occurs also in the Upper Purbeck : at Eurlston 

 Bay in both cases. 



5 & 5*. Opeidea GEAisrLosA (Sow.) ; and var. eascicitlata (Forbes) ; 

 and var. paucigeaxulata, nov. (PI. YIII. figs. 18-21.) 



Cypris granulosa. Sow. 1836, Trans. Geol. Soc. ser. 2, vol. iv, 

 pp. 177 (?), 260, 345, pi. 21. fig. 4, 



Cypris granulosus, Mantell, "Wonders of Geolog}% 1838, vol. i. 

 p. 344, tab. 46. fig. 9 (fig. 7 is a bad copy of a part of Fitton's 

 fig. 1, and fig. 9 of part of Fitton's fig. 4). Cypris granulosa, 

 Mantell, Wonders, 3rd edit. p. 77, fig. 9, and 6th edit. 1848, 

 vol. i. p. 405, lign. 98, fig. 3 (as fig. 9 above). 



Cypris granulosa, Mantell. Wonders, 7th edit. (T. E. Jones), 

 1857, vol. i. p. 419, lign. 104, fig. 2. 



Cypris granulosa, ManteU, Medals of Creatiou, 1844, vol. ii. 

 p. 545, lign. 119, fig. 4 ; and 2nd edit. 1854, vol. ii. (T. E. Jones), 

 p. 527, lign. 174,' fig. 4. 



Cypris fascicidata, Forbes, MS. July 18, 1851, & MS. July 23, 1854. 



Cypris fascicidata, Forbes, in LyeU's Manual Elem. Geol. 5th 

 edit. 1855, p. 295, figs. 337 h ; Elements of Geology, 6th edit. 

 1865, p. 378, figs. 371 h. 



Cypriclea gramdosa, Morris, 1854, Catal. Brit. Foss. p. 104 

 (omitting Dunker's synonym and the reference to Wealden). 



