PLATE LXXXYII. 
1. Astarte Borealis. (Northern Astarte.) Depressed, sub-orbicular, equilateral; beaks small, pointed; lunette elongated, 
acute, deep; surface, with fine lines of growth; margin entire. 
2, 3, 4. A. Pumila. (Dwarf Astarte .) Obliquely ovate, convex; anterior side produced, obtuse; posterior side small, with semi¬ 
circular edge; surface, with many, concentric ridges; edge, crenulated within. 
5, 6. A. Impolita. (Unpolished Astarte.) Obovate, convex, cuneiform; angular at beaks ; lunette in lanceolate groove; surface, 
with many, transverse grooves. 
7. A. Bipartita. (Double-parted Astarte.) Globose, obcordate; beaks acute; lunette large, concave, smooth; surface, with six 
to eight, large, transverse ribs ; internal edge crenulated. 
8. A. Nitida. (Shining Astarte.) Depressed, transversely obovate; beaks pointed; lunette lanceolato; surface plain; edge 
crenulated. 
9. A. Triangulata. (Triangular Astarte.) Triangular; beaks produced; posterior side curved; basal line straight; surface, 
with rude, transverse ribs and sulci. 
10. 42. A. Lurida. (Pale Astarte.) Convex, transversely oblong, depressed; surface, with many, transverse ribs; margin inter¬ 
nally crenulated; lunette elliptical. 
11. A. Lae vis. (Smooth Astarte.) Sub-orbicular, convex, elongated; beaks acute; surface smooth. 
12. A. Elegans. (Elegant Astarte.) Convex, transversely oblong; disc depressed; surface, with many, transverse ribs; lunette 
cordate; margin internally crenulated. 
13. A. Extensa. (Extended Astarte.) Sub-trigonal, elongated; beaks obtuse; surface smooth, with ridge from beak to base; 
with three or four, concentric sulci. 
14. A. Gairensis. (Gairloch Astarte.) Transversely ovate, sub-compressed; beaks small, pointed; lunette lanceolate, deep; 
surface, with many, broad, concentric ribs; external margin broad, plain. 
15. A. Oblonga. (Oblong Astarte.) Convex, transversely oblong; beaks small; lunette cordiform, pointed, concave; surface, 
with large, transverse ribs; internal edge crenated. 
16. A. Multicostata. (Many-ribbed Astarte.) Sub-orbicular, compressed; beaks prominent; lunette lanceolate; surface, with 
many, concentric ribs. 
17. 18. A. Scotica. (Scottish Astarte.) Sub-cordiform, sub-compressed; umbones central; lunette cordiform; surface, with 
many, parallel, transverse ribs. 
19. A. Obliquata. (Somewhat Oblique Astarte .) Obovate, transverse, depressed; surface, with many, concentric striae, crossing 
a few ribs or lines of growth; internal margin crenulated; shell slender. 
20. Venus Imbricata. (Imbricated Venus.) Cordiform, orbicular, convex; lunette elongated, flat; hinge-line arcuated; internal 
edge crenulated; surface, with nine to eleven, imbricated ribs. 
21. A. Obovata. (Obovate Astarte.) Convex, obovate ; anterior margin sub-truncated; lunette impressed; surface corrugated, 
with transverse ribs ; interior margin crenated. 
22. A. Excavata. (Excavated Astarte.) Convex, obovate; anterior side truncated; beaks ill-defined; lunette hemispherical, 
excavated; with deep sulcus enclosing cartilage; edges sharp ; margin dentated ; surface, with transverse ribs; teeth striate. 
24. A. Formosa. (Handsome Astarte.) Sub-triangular, compressed; edges thickened; beaks obtuse; lunette elongated, con¬ 
cave ; surface, with about ten, transverse, reflected ribs. 
25. A. Minima. (Least Astarte.) Sub-orbicular; beaks obtuse, central; sides equal; surface, with strong, concentric ribs. 
26. A. Carinata. (Keeled Astarte.) Sub-triangular; sides straight; with ridge from beak to margin; surface, with concentric 
ribs and sulci. 
27,28. A. Orbicularis. (Orbicular Astarte.) Lenticular; hinge-line ending in angle; surface, with many, concentric, reflected 
lamellae; edge smooth. 
29. A. Trigonalis. (Trigonal Astarte.) Triangularly cordiform, compressed; beaks acute; anterior side smooth ; posterior edge 
concave near beaks ; surface flattened; disc, with many, transverse sulci. 
30. A. Rugata. (Wrinhled Astarte.) Obovate, gibbose; anterior side sub-truncated; lunette obovate, concave; with a few ribs 
near beaks ; edge crenated internally. 
31. A. Cuneata. (Wedge-shaped Astarte.) Gibbose, cordiform ; back broad, flattened; lunette cordiform; margin entire within. 
32. 33. A. Multistriata. (Many-striated Astarte.) Sub-triangular, convex, cuneiform; surface, with many, concentric ribs; 
intervening spaces, with longitudinal striae; lunette large, broad. 
34. A. Ovata. (Ovate Astarte.) Obovate; beaks obtuse; 1 nnette lanceolate, narrow; surface, with concentric wrinkles. 
35, 36. A. Rotunda. (Rounded Astarte.) Lenticular, inflated; lunette elongated, deep ; surface, with small, concentric sulci; 
posterior surface plaited ; internal edge crenulated; shell very thick.| 
37. A. Lineata. (Lineated Astarte.) Obovate, lenticular, depressed ; anterior side truncated; lunette lanceolate; surface, with 
about thirty, concentric, transverse ribs; intervening sulci, with many, minute striae; shell thin; margin entire. 
38. A. Concinna. (Neat Astarte.) Oblong-ovate, convex; beaks oblique; lunette elongated, deeply sunk; surface, with many, 
concentric sulci. 
39. A. Aliena. (Alienated Astarte.) Sub-orbicular, elongated; beaks central, acute; surface, with transverse sulci. 
40. A. Striata. (Striated Astarte.) Lenticular; beaks small, approximating; lunette ovate, flat; surface, with many, transverse 
striae; margins obtuse ; shell thick. 
41. A. Sulcata. (Fuirowed Astarte.) Sub-orbicular, compressed; beaks prominent, central; lunette lanceolate, shallow; sur¬ 
face, with a series of flat, concentric ribs; internal margin crenulated. 
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