PLATE XLVIII. 
1 7 2. Sipho Clathrata. ( Barred Sipho.) Conical ; vertex thick, incurved ; with strong, longitudinal ribs 
from apex to base ; crossed by transverse ribs ; aperture oval. 
ij, 4. Emarginula Reticulata. ( Reticulated Emarginula .) Conical, elongated ; vertex elevated ; with 
twenty-four or more divergent ribs, crossed by many, filiform strise ; fissure short; aperture oval; smooth 
internally. 
5, 5% 6. E. Scalaris. ( Ladder-Wee Emarginula .) Conical ; vertex eccentric, obtuse ; with divergent, equal 
ribs ; crossed by fine strise ; aperture obovate. Diameter £ in. Fig. 5*, natural size. 
7, 8. Fissurella Grseca. ( Creek Fissurella.) Oblong-ovate, convex ; with many, small ribs ; crossed by 
many, transverse, filiform ribs; inside oblong-oval, smooth, margin crenulated. 
9, 10. E. Crassa. ( Thick Emarginula.) Conical, thick; vertex short; apex sub-acute; with equidistant, 
divergent, flat ribs ; intervening sulci with four or five longitudinal strise, crossed by lines of growth ; marginal 
fissure wide ; aperture oblong-oval, glossy. 
11. Patella Mucronata. (. Pointed Patella.) Smooth, sub-conic, depressed ; apex mucronate, central, acute : 
aperture orbicular ; marginal lips concave. 
12, 13. P. Striata. ( Striated Patella .) Oblong-ovate, oblique, conical; with many, acute, divergent ribs : 
sides frequently pressed inwards ; vertex acute. 
14, 14*, 15. E. Tricarinata. ( Three-keelecl Emarginula.) Conical; with three, principal, divergent ribs ; 
aperture elongated, quadrangular. Fig. 14*, natural size. 
16, 16*, 17. E. Sulcata. ( Furrowed Emarginula.) Acute, conical; with seventeen flat ribs and broad 
sulci between, crossed by fine strise ; marginal fissure short; aperture sub-orbicular. Fig. 16*, natural size. 
18. P. Rugosa. {Rugged Patella.) Obovate, thick, depressed ; apex depressed; dorsal end concave; with 
many divergent ribs and two or three concentric undulations. 
19. P. Sinuosa. {Crooked Patella.) Oviform, smooth, depressed, sub-conic; vertex irregular, prominent: 
with indistinct lines of growth. 
20. P. Scutiformis. {Scuttle-shaped Patella.) Scutiform, smooth, elliptical, depressed; vertex inflexed, 
acute ; with fine, divergent strise. 
21. 22. P. Laevis. {Smooth Patella.) Sub-conic, slender, depressed; vertex obtuse, eccentric; surface 
smooth, shining ; aperture oviform. 
23. P. Lata. {Broad Patella.) Obovate, depressed ; vertex eccentric ; with thirty, obtuse, divergent ribs. 
24, 25, 26. P. Nana. {Dwarf Patella.) Oblique, smooth, sub-conic; vertex obtuse ; aperture oval. Fig. 26, 
natural size. 
27, 28, 29. P. Aneilloides. {Ancilla-shaped Patella.) Convex, smooth, depressed; vertex spiral; apex 
reflected. Fig. 29, natural size. 
30. P. Retrosa. {Retroflexed Patella.) Sub-conic, smooth, depressed ; apex retroflexed, acute ; with about 
fourteen, broad, divergent ribs; aperture elliptical; margin undulated. 
31,32. P. AJqualis. {Equal Patella.) Conical, smooth; with a few, obsolete radii; apex obtuse; base 
oviform. 
33. P. Curvata. {Curved Patella.) Conical, smooth; anterior end curved; vertex inclined posteriorly; 
apex acute ; aperture deep, orbicular ; marginal lip plain. 
34. P. Latissima. {Very Broad Patella.) Depressed, smooth, thin ; vertex eccentric, flat; concentrically 
undulated ; aperture orbicular. 
35. 40. Metoptoma Imbricata. {Imbricated Metoptoma.) Conical, scutiform ; apex obtuse ; with concentric 
imbricated ribs. 
36. P. Lateralis. {Lateral Patella.) Sub-conic, smooth; vertex depressed ; apex acute ; with lateral sulcus 
and posterior radiations. 
37. M. Sulcata. {Furrowed Metoptoma.) Convex; posterior side arcuated; concentrically sulcated ; apex 
obtuse. 
38. M. Oblonga. {Oblong Metoptoma.) Oblong, cordiform, conical, convex ; margin rounded ; vertex obtuse. 
39. M. Pileus. {Bonnet Metoptoma.) Scutiform, conical, smooth ; apex obtuse. 
41. M. Elliptica. {Elliptical Metoptoma.) Elliptical, sub-conic, smooth ; vertex terminal, acute, elongated. 
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