PLATE IV. 



FIG. 



1 a — c. Cypridella Wrightii, sp. nov. Carapace. Cork. (Page 34.) 



a. Left valve shown ; b, dorsal aspect ; c, front-view. Magnified 8 diameters. 



2 a — c. Cypridella quadrata, s'p. noY. Cast of carapace. Vise. (Page 35.) 



a, Right valve seen (the transverse furrow is not well shown, nor the lateral indentation 

 under the beak); 6, front- view ; c, dorsal-view (dorsal furrow not shown). Magnified 4 

 diameters. 



3 a — c. Ci/pi'idellina ffalea, s\). nov. Shell. Cork. (Page 30.) 



a, Left valve ; b, front edge ; e, ventral edge. Magnified 4 diameters. 



4 a — c. Cypridella Edivardsiana, De Koninck, var. septentrionalis, nov. Shell. Cork. (Page 32.) 



a, Right valve ; b, front-view c, dorsal edge. Magnified 4 diameters. 



5 a~c. Sulcuna cuniculus, sp. nov. Shell. Cork. (Page 37.) 



a, Left valve (antero-dorsal region is buried in the stone); b, end-view; c, edge-view. 

 Magnified 4 diameters. 



6 a, b. Sidcuna lepus, sp. nov. Shell. Cork. (Page 36.) 



a. Right valve ; b, end-view. Magnified 4 diameters. 



7 a — c. Sulcuna lepus, sp. nov. Shell. Cork. (Page 36.) 



a, Right valve (anterior end partially imbedded) ; b, end-view ; c, edge-view. Magnified 

 4 diameters. 



8 a — c. Sulcuna cunicidus, sp. nov. Shell. Cork. (Page 37.) 



a, Right valve ; b, end-view ; c, edge-view. Magnified 4 diameters. 



9 a — c. Cypridellina cyprelloides, sp. nov. Shell. Cork. (Page 36.) 



a, Left valve ; b, front end ; c, edge-view. Magnified 4 diameters. 



10 a — c. Cyprella c/u-ysalidea, De Koninck, ya.r. subannulata, nov. Shell. Settle. (Page 38.) 



«, Left valve ; b, ventral view ; c, front edge. Magnified 4 diameters. 



1 1 a — c. Cyprella chrysalidea, De Koninck, var. subannulata, nov. Shell. Cork. (Page 39.) 



a, Right valve ; b, front aspect ; c, ventral aspect. Magnified 4 diameters. 



12 a, b. Cyprella anmdata (De Koninck). Shell. Cork. (Page 40.) 



a, Right valve, magnified 4 diameters, b, Eeticulate ornament, magnified 20 diameters). 



13 ft, b. Cyprella an7iulata (De Koninck). Shell. Settle. (Page 41.) 



a. Left valve ; b, front-view. Magnified 4 diameters. 



14 a, b. Cyprella chrysalidea, De Koninck. Cast of carapace. Vise. (Page 38.) 



a, Showing left valve ; b, dorsal view of both valves, open. Magnified 4 diameters. 

 15. Cyprella chrysalidea, De Koninck. Cast of the left valve; imperfect. Vise. Magnified 4 



diameters. (Page 38.) 



16 a — c. Cyprella chrysalidea, De Koninck. Shell. Settle. (Page 39.) 



a, Right valve ; b, front-view ; c, edge-view. Magnified 4 diameters. 



17 a — c. Cyprella annulat a {De Koninck). Shell. Cork. (Page 40.) 



a. Left valve ; b, front edge ; c, ventral edge. Magnified 4 diameters. 



18 a, b. Cyprella chrysalidea, De Koninck. Compressed cast of carapace. Vise. (Page 38.) 



a, Right valve (the outline of hood and tubercle not indicated) ; b, front-view. 



19 a — d. Entomis obscura, sp. nov. Worn shell. Cork. 



a. Right valve, magnified 4 diameters, b, The same, magnified 8 diameters, c ^- d, end- 

 view and edge-view, magnified 8 diameters. 



20 a — c. Entomis Koninckiana, sp. nov. Shell. Settle. 



a, Right valve, somewhat imperfect at the antero-dorsal corner ; b, end-view ; c, ventral 

 aspect. Magnified 4 diameters. 



21 a — c. Entomis Burrovii, sp. nov. Shell. Settle. 



a. Left valve; b, dorsal view; c, end-view. Magnified 4 diameters. 

 22. Entomis concentrica (De Koninck). Carapace. Vise. Dorsal aspect in outline. Magnified 4 



diameters. 



23 a, b. Entomis biconcentrica, Jones. Carapace. Cork. 



a. Dorsal aspect, in outline ; b, end-view of the same open carapace, in outline. Magnified 

 4 diameters. 



24. Entomis obscvra, sp. nov. Cast. Settle. Right valve. Magnified 4 diameters. 



25 a, b. Entomis concentrica (De Koninck). Cast of carapace. Vise. 



a. Left side ; b, dorsal view. Magnified 4 diameters. 



26 a — d. Entomis biconcentrica, Jones. Shell. Cork. 



a. Left valve ; b, edge-view ; c, end-view ; a, b, c, magnified 4 diameters, d. Reticulate 

 and ridged surface ; magnified 25 diameters. 



27 a — c. Beyrichia yigantea, sp. nov. Shell partly preserved on cast. Longnor, Derbyshire. 



a. Left valve ; b, edge-view ; c, end-view. Magnified 4 diameters. 

 28. Beyrichia gigantea, sp. nov. Shell. Cork. Right valve. Magnified 4 diameters. 



