FROM THE DEEP BORING AT RICHMOND. 767 
backwards, with a smooth thickening of the test, beginning with an 
irregular boss just behind the front hinge-joint. Posterior margin 
narrowed, depressed, bordered with a very slight, tubercled rim.. 
Some specimens from other depths in the boring (figs. 40, 41) are 
larger and show variation in the intensity of the tubercles. 
This is the Cythere (Cythereis) quadrilatera, Romer, ‘ Monogr. 
Cretaceous Entom. England,’ Pal. Soc. p. 18, pl. 3. fig. 10; pl. 4. 
fig. 10. It occurs also in the Portland Oolite of Dorset. 
5. Two obscure specimens suggest the possibility of their having 
been—one a Cythereis and the other a re ae but they are unde- 
terminable. 
The above-described Ostracoda from § I. belong to common types, 
and offer nothing specially characteristic of any particular formation ; 
similar forms ranging through Secondary and Tertiary into Recent 
times. C. quadrilatera is well known in the Chalk and Gault; and 
it accompanies other ‘Cretaceous ” forms in the soft, white, chalky 
Portland Oolite at Ridgeway, Upway, Dorset. See Quart. Journ. 
Geol. Soc. xxxvi. p. 236. 
§ IL. From the Stratum at 1151 feet to 1151 feet 6 inches. 
1. FoRAMINIFERA. 
1. CRISTELLARIA RoTULATA (Lamarck). 
Small; with nine triangular chambers in the last whorl; and 
with a subtranslucent convex umbilicus, a flush surface, sharp edge, 
and nearly straight septal lines. 
2. CRISTELLARIA ITALIcA (Defrance). 
Small, short, thick; a well-known triangular (arrested ?) form of 
Cristellaria. 
3. CRISTELLARIA, sp. indet. 
A small broken specimen, probably derived; white and rather 
rough. It looks like the butt-end (early chambers) of an elongate 
or Marginuline Cristellarca. 
2, OSTRACODA. 
1. Barrpra JuppIANA, sp. nov. (Pl. XXXIV. fig. 18.) 
Very broad (that is, the valve is very high if placed in its natural 
position), subovate, smooth, delicately pitted. 
Prof. J. W. Judd’s name is associated with this species, found by 
his careful researches in the deep strata at Richmond. 
2, Barrpra TRIGONALIS, sp. nov. (Pl. XXXIV. fig. 19.) 
Narrower than the foregoing, but broad and almost triangular; 
smooth and delicately pitted. 
