PLATE LX. 
1. Gryphsea Incurva. (Incurved Grypluea.) Elongated; larger valve incurved; beak, when 
visible, sharp; smaller valve oblong, externally concave; surface concentrically undulated; sometimes 
laminated; sides straight. 
2. G. Bullata. (Gem Grypluea.) Transversely obovate, thin, smooth, compressed; upper valve 
smaller than lower; lower valve concave, with concentric lines of growth ; beaks minute; lateral lobe 
small, obscure. 
3. 10, 11, 12, 13. G. Conica. (Conical Grypluea.) Oblong, curved; larger valve convex, with 
conical, obtuse beak and small, wing-like process; smaller valve oval, flat, with margin and wing 
crenated. 
4. G. Recurvata. (Recurved Grypluea.) Sub-rotund; one valve very convex, conical, with 
curved apex; the other shallow, lid-shaped; beak sub-involute; hinge indistinct; surface smooth. 
5. G. Sinuata. (Bent Grypluea.) Obliquely ovate; larger valve concave, bent, with one side 
flat; umbo curved, minute; smaller valve flat, triangular; surface smoothisli, with many lines of 
growth; hinge-pit marginal, long, narrow, curved. 
6. 7, 8, 9. G. Haliotoidea. (Haliotis-formed Grypluea.) Oval, compressed; one valve, with deep, 
internal groove; margin thin, broad, fringed externally, crenated internally; surface transversely 
wrinkled; beaks involute. Length, 1 ^ in. 
14, 15. G. Undata. (Waved Grypluea.) Elongated, convex; deeper valve carinated along 
centre; with a series of branching ribs, diverging from keel; flat valve smooth, plain. 
16. G. Digitata. (Fingered Grypluea,) Obliquely elongated, curved, gibbose ; with five or six, 
marginal, canaliculated, finger-like processes; surface smooth; deeper valve with several ridges. 
17. G. Laevigata. (Smooth Grypluea.) Elongated, curved, smooth; deeper valve inflated, 
obtusely carinated near hollow side ; flat valve semi-circular ; beak small, pointed. 
18. Hinnus Dubissoni. (Dubisson’s Hinnus.) Oblong, thickish; with many, divergent ribs, 
imbricated towards lower part of valves, and with remote lines of growth ; ears nearly equal, with a 
few, longitudinal sulci; umbo obtuse. 
19. G. Macullochii. (Maeulloch’s Grypluea.) Longitudinal, obovate, gibbose, oblique; beaks 
produced, incurved; base angular; surface strong, with curved lines of growth. 
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