38 THE ENTOMOSTRACA OF 



Cythere {Cythereis) senilis is very nearly allied to C. fistulosa and C. runcinala, 

 Baird : x it is represented by one specimen only from the Crag of Suffolk. 



No. 2. Cythereis Bowerbankiana, spec. nov. Plate VI, figs. 7, 8. 



INCH. 



Length, ^ Eocene : London. 



Carapace-valves oblong, obliquely rounded in front, contracted behind, most convex 

 posteriorly and ventrally ; margins of the extremities depressed, more or less coarsely 

 denticulate ; ventral portion strongly ridged and coarsely spined : surface of valves 

 coarsely and irregularly reticulate ; bearing coarse irregular spines along the dorsal 

 portion, and scattered short spines or tubercles about the central portion ; both spines 

 and reticulations variable in their development. 



Dorsal profile sagittate with jagged outline; end-view triangular. 



A few specimens of single valves of this species occurred in the London Clay of 

 the Copenhagen Fields at the Great Northern Railway cutting ; and Mr. W. K. Parker 

 has lately favoured me with two fine perfect carapaces from the London Clay of 

 Wimbledon Common. 



I associate with this characteristic and remarkably fine species the name of one of 

 the most successful and distinguished of the geologists who have studied the natural 

 history of the London Clay, and of the British fossiliferous deposits generally. 



No. 3. Cythereis horrescens, Bosquet. Plate V, figs. 9, 17 a, 17 b. 



Cytheke horuescens, Bosquet. Mem. Couron. Acad. Belg., xxiv, p. 116, t. 6, fig. 5. 

 ? — latidentata, Bomemann. Zeitsch. Deutscb. geol. Ges., vii, p. 366, t. 21, fig. 6. 



INCH. 



Length, -^ Recent : Norway. 



Eocene : England ; France. 



Carapace-valves oblong, rounded at the ends, which are more or less coarsely denti- 

 culate ; ventral ridge coarsely spined : surface beset with scattered blunt spines 2 and 



1 ' Proceed. Zool. Soc. London,' 1850, p. 256: Annulosa, t. 18, figs. 1 — 3, 7 — 9. Possibly these are 

 varieties of one species. 



2 In fig. 9 the dorsal portion of the valve ought to bear blunt spines, not tubercles. 



