4 CRETACEOUS ENTOMOSTRACA. 



this kind of Pontocypris, while his C. unguiculus and arcuata (op. cit.) look more 

 like Paracypris, unless they prove to be males. 



Dr. G. S. Brady has described and figured an allied form as Pontocypris faha 

 (Reuss), from the Antwerp Crag (' Trans. Zool. Soc.,' vol. x, 1878, p. 382, 

 pi. Ixiii, figs. 6 a — e), but it is obliquely rounded in front and has a greater 

 thickness of carapace at the anterior third. 



Locality. — P. trigonalis has been collected from the Gaidt of Folkestone by 

 Mr. F. Chapman. 



Neither Pontocypris attenuata, Brady, ' Ann. Mag. N. H.,' ser. 4, vol. ii, 1868, 

 p. 35, pi. iv, figs. 12 — 14, nor Pontocypris intermedia, Brady, ibid., p. 220, 

 pi. xiv, figs. 1, 2, though closely allied, embrace our Pontocyprides from the Chalk. 



2. Pontocypris triquetra (Jones). Plate III, figs. 22 — 24, 35 — 37. 



Baiedia teiquetea, Jones. Monogr. Entom. Cret., 1849, p. 27, pi. vi, figs. 



19 a—c. 



Fig. 22. Length "694 ; height "361 ; thickness '44 mm. 



Fig. 35. „ '725; „ '375; „ "375 „ (large variety or female). 



This is a near ally to P. acuminata and P. attenuata referred to above, but it 

 is much stouter, being thicker, higher, not acuminate behind, and its greatest 

 thickness is medial (not at the anterior third) ; it is related also to P. trigonalis 

 just described, but is thicker, higher, and more triangular. 



Fig, 22 shows a sloping, and fig. 35 a rounded antero-dorsal margin ; such 

 conditions seen in Dr. Gr. S. Brady's figures of P. faha, alluded to above, are 

 regarded by him as sexual features. 



Edge view of carapace long-oval ; end view nearly circular, rather oval. 



Localities. — Two valves from the Chalk of Gravesend, four carapaces from the 

 Detritus, Charing, and one valve from the Greensand of Blackdown, Devon. 



3. Pontocypris Bosquetiana, sp. nov. Plate II, fig. 65; and Plate IV, fig. 3. 



Baiedia angusta (partim), Jones. Monogr. Entom. Cret., 1849, p. 26, pi. vi, 



figs. 18/,/' (not a— e'). 

 CxTHEEiDEis ANGUSTA (partim), Jones. Geol. Mag., 1870, pp. 75, 77. 



Fig. 65. Length -88 ; height "4 ; thickness '3 (?) mm. 



Fig. 3. „ -8; „ -4 



One of the old figures of this form (interior of a left valve, PI. IV, fig. 3) has 



