Frof. T. Rupert Jones — Fossil Bivaked Entomostraca. 109 



Fig. 4. Partly imbedded and partly broken left valve. 



Fig. 5. Shows tlie shell (broken) of a left valve. 



Fig. 6. Shows a restored right valve from a hollow impression of 

 exterior. 



Fig. la. Shows the shell of a left valve, imperfect at the notch. 



Fig. Ih. Shows the dorsal aspect of the same specimen. 

 These are all magnified 20 diameters. 



Cypridea verrucosa has some resemblance to Lyell's figure of 

 Cypris tuhercidata, Forbes. But the latter shows no notch ; and, if 

 it be distinct from Sowerby's C. tuhercidata, its name is pre-engaged. 



3. Cypridea bispinosa, sp. nov. Plate III. Figs. 9 and 10. 

 Valves ovate-oblong, with indenture and notch, and with a coarsely 



pitted surface, bearing two sharp tubercles on the posterior third. 

 This has a near relation to Cypridea spinigera (Sow.), but is more 

 oblong in shape, having a straighter ventral edge ; and instead of 

 one central tubercle, it possesses two spinous processes, one on the 

 postero-dorsal third of the valve, and one below and rather behind 

 the middle of the valve. 



Fig. 9 is restored (reversed) from a hollow impression of the 

 exterior of a right valve. Fig. 10 is an internal cast of a left valve, 

 showing traces of the muscle-spot. Both are magnified 20 diameters. 



4. Ctpkidea Valdensis (Fitton). Plate III. Fig. 8, oblong var. 

 of C. Valdensis (?) ; internal cast, showing muscle-spot. Fig. 11, 

 outline of one of the common ovate and notched forms of C. Valdensis. 

 Magnified 20 diameters. 



The most common species found in the Wealden is that which 

 Sowerby at first referred to Desmarest's Cypris faba, see Min. Conch., 

 pi. cccclxxxv. (1824), and which Fitton, with Sowerby, subsequently 

 named Cypris Valdensis. From Sowerby's figure, and from the many 

 particular Cypridiferous strata to which Fitton alludes in his memoir 

 " On the Strata below the Chalk," etc., we know that the specially 

 abundant form to which he refers has ovate-oblong valves, with a 

 decided antero-ventral beak and notch. The form has been recog- 

 nized also by Dunker and others as the C. Valdensis. The figure, 

 however, given by Sowerby and Fitton in the above-mentioned 

 Memoir, Trans. Geol. Soc, 2nd ser. vol. iv. pi. 21, fig. 1, is unfortu- 

 nately not that of the common form, but of an oblong variety (if not 

 species), with the notch and beak indistinct or nearly obsolete. 



The ovate and strongly beaked form of C. Valdensis is present 

 (though rare) in the Shotover sandstone (Fig. 11). It is narrower 

 than the individual drawn in the " Monogr. Foss. Estherise," Pal. 

 Soc, pi. 5, fig. 28 ; and approaches closely Dunker's figure of this 

 species. 



Among the badly preserved casts of valves in the iron-sandstone, 

 is one of an oblong carapace (Fig. 8), possibly of the squarer form of 

 C. Valdensis, since its surface shows no trace of tubercles. This is 

 of considerable interest as showing marks of the muscle-spot. In 

 this valve there were six small internal pits ; three parallel in a 

 vertical row, with one oblique mark in front and two oblique 

 behind. 



