336 PROF. T. E. JONES ON THE OSTEACODA 



6. Metacypris Forhesii, nov. 1 Eare, and peculiar to the 



6*. , var. verrucosa, nov. J Mid-Purbeck. 



LowEE-PiTEBECK Species (5 species, all peculiar to this Division). 



5. Oypris ]jurheckensis, Forbes. Most abundant. 



4. Candona hononiensis, Jones. 1 Often common with C. pur- 



3. ansata, nov. J becJcensis. 



2. Cy there transiens, nov. 



1. retirugata, nov. 



1*. , var. rugulata, nov. 



1«*^ ^ yar^ textilis, nov. 



► Marine forms : rare. 



§ YIII. Desceiption- or the Species. 

 I. Genus Cypeibea, Bosquet, 1852. 



Cypris, Auctorum, 



Cypridea, Bosquet, 1852, Mem. couron. Acad. Eoy. Belg. vol. 

 sxiv. P. 47 of the Memoir, " Description Entom. foss. Terrains tert. 

 Prance et Belg." 



Cypridea (subgenus of Cypris). Jones in Morris's Catal. Brit. 

 Poss. 1854, p. 104. 



Cypridea (? subgenus of Cypris), Jones, Monogr. Brit. Tert. 

 Entom. 1856, pp. 9, 10. 



Cypridea, Jones, Monogr. Poss. Esth. 1862, p. 106, & Appendix, 

 p. 127. ^ 



Cypridea, Huxley & Etheridge, Catal. Coll. Possils Mus. Pract. 

 Geol. 1865, p. 254. 



Cypridea, H. "Woodward, CataK Brit. Poss. Crustac. 1877, p. 88. 



Cypridea, Jones, Geol. Mag. dec. 2, vol. v. 1878, pp. 107 &c 



Carapace-valves subtriangular, obovate, or ovate-oblong ; convex 

 in the middle ; broad (high) at the anterior third ; narrower 

 behind ; one or both ends obliquely rounded ; somewhat compressed 

 anteriorly ; notched at the antero-ventral angle, behind a small 

 beak-like process ; sometimes having only a slight indentation below 

 and behind a thickening of the antero-ventral angle; sometimes 

 this is traceable only by a curvature of the edge inside. Edge-view 

 more or less narrow-ovate. End-view subovate. Surface punctate ; 

 sometimes almost smooth ; often tuberculate ; tubercles small or 

 large, variously disposed. The hinge-margin is definitely straight 

 along the middle third or more of the dorsal edge, with the hinge- 

 angles more or less defined, and is oblique to the main axis of the 

 valve. The left valve is the largest, and receives the dorsal edge 

 and a straight ridge of the other valve in grooves on its dorsal and 

 ventral contact-margins, the outer edge of the ventral margin of 

 the left valve overlapping that of the light valve. The ridges and 

 furrows or ledges of contact vary in intensity in difl'erent individuals. 



1. Ctpeidea vau)ensis (Pitton). [Not figured here.] 



Cypris fata. Sow. (not Desmarest). Annals of Philos. vol. viii. 

 1824, p. 376; Min. Conch. 1824, tab. 485, pp. 136-8. 



