PLATE XXXVI. 
PAGE 
Figs. 1-5. Cythere exanthemata n. sp 117 
1. Right valve of a young individual, with the nodes but little 
developed. 
2, 3. Left valves of two older individuals, showing the usual 
characters. 
4. Largest right valve seen. 
5. Interior of right valve. 
Figs. 6-8. Cytiiere kvax n. sp 119 
6. Rather short right valve. 
7. Left valve. 
8. Another right valve. 
Figs. 9, 10. Cythere evax var. orloxgata n. var 119 
9. Right valve. Plum Point. 
10. Left valve with surface ornament obsolescent probably due to 
age. 
Figs. 11-15. Cythere maktixi n. sp 112 
11-13. Three right valves showing slight differences in ornament and 
outline. 
14. Left side of an entire carapace, tilted slightly so as to show the 
dorsum of the opposite valve. 
15. Left valve of a variety differing from the typical form of the 
species in the surface ornament and in being a little 
shorter. 
Fig. 16. Cythere dorsicornis n. sp 116 
16. The left valve upon which this variety is founded. Plum Point. 
Fig. 17. Cythere producta n. sp 115 
17. A left valve showing the unusual posterior extension charac- 
terizing this species. In other specimens believed to be of this 
species the posterior end is wider. Plum Point. 
Figs. 18-20. Cythere micula n. sp 116 
18. A small left valve. Plum Point. 
19. A large right valve. 
20. Another left valve. The left valve has minute spines on the 
anterior and posterior borders that are scarcely visible at this 
magnification. 
Figs. 21-23. Cythere xitidula n. sp 107 
21. 22. Two left valves showing slight differences in outline. Plum 
Point. 
23. The interior of a third left valve showing that the anterior 
tooth of the hinge is very faintly developed in this species. 
Only a tooth socket is distinguishable at the posterior 
extremity. 
Figs. 24, 25. Cythere xitidula var. calvertensis n. var 108 
24. A left valve of this variety or species. 
25. A right valve referred to this variety or species with some doubt. 
Figs. 26-33. Cythere porcella n. sp 106 
26. 27. Two left valves of the form regarded as typical for the species. 
Plum Point. 
28. Another left valve differing slightly in shape and probably 
somewhat macerated. 
29. Inner side of fourth left valve. 
30. A right valve. 
31. A left valve somewhat doubtfully referred to this species and 
possibly indicating a distinguishable variety. 
32. A more ovate left valve that also might be distinguished. 
33. Interior of a right valve of the normal form. 
Figs. 34-39. Cy'there durnsi n. sp 103 
34. A well-preserved right valve. 
35. A smaller and apparently macerated right valve. 
36. Interior of a right valve. 
37. A large and unusually well-preserved left valve. 
38. Another left valve on which the longitudinal striation is obsolete. 
39. Interior of a left valve. 
The figures on this plate are all magnified 20 diameters and the specimens 
are all from the Calvert formation at Plum Point, Md. 
