18 CRETACEOUS ENTOMOSTRACA. 



angles are more marked. The punctation is weaker, and obsolete in some 

 specimens. Numerous sharp spinules are observable on some parts of the 

 surface. In a worn condition the valves are quite smooth, as in some from 

 Woodburn, near Carrickfergus (Antrim), collected by Mr. J. Wright. There are 

 gradations between this form and the type on one hand, and the next variety 

 (reticosa) on the other. 



Localities. — Chalk, Antrim ; Gault, Folkestone and Godstone, coll. F. Chapman. 



3**. Cythere Harrisiana, Jones, var. reticosa, nov. Plate I, fig. 46. 



Length '68 ; height "4 mm. 



This has subquadrate valves, straight above and below, but faintly sinuous at 

 the anterior hinge ; rounded in front, with a slightly raised and denticulate 

 margin ; angular at the depressed hinder margin below the main body of the 

 valve, there rising with two definite posterior angles, dorsal and ventral. The 

 latter of these is the end of a low straight ridge overhanging the nearly flat ventral 

 face of the valve, and, continuing up round the anterior third of the valve, it 

 bounds a curved furrow-like depression behind the margin. The surface has a 

 low boss just in front of the centre, and is strongly punctate with almost regularly 

 placed pits, making a coarse reticulation. 



This is evidently related to G. Harrisiana ; but its squareness, more definite 

 central and lateral swellings, and very distinct pitting separate it as a variety. 



Locality. — In the Qault at Godstone, Surrey (coll. C. D. Sherborn), and 

 Folkestone, Kent (coll. F. Chapman). 



4. Cythere gaultina, Joyies. Plate I, figs. 35, 36. 



Cttheeeis gaultina, Jones. Monogr. Entom. Cret., 1849, p. 17, pi. ii, figs. 7 a — c. 

 CxTHEEE GAULTINA, Joites. Geol. Mag., 1870, pp. 75, 77. 



Length 7 ; height '3 ; thickness -2 mm. 



We have nothing to add to the description already given. We may remark, 

 however, that Reuss's Cythere pertnsa (' Denksch. Akad. Wiss. Wien,' vol. vii, 

 1854, p. 142, pi. xxvii, figs. 5 a, h, from the Cretaceous series of the Eastern 

 Alps, may claim a relationship with C. gaultina, though the two difi'er in 

 the arrangement of the elevations of the surface. 



Localities. —The Gault of Folkestone, Kent, and of Godstone, Surrey. 



