PLATE XCVII. 
1, 2, 3. Pollicipes Sulcatus. {Furrowed Pollicipes.) Valves, with longitudinal striae ; terminal valve, Fig. 2, 
elongated, rhomboidal; posterior valves, Figs. 1 and 2, acuminated, broad, lanceolate, carinated; both with 
sharp, longitudinal striae. 
4, 5, 6. P. Unguis. {Claw Pollicipes.) Valves very curved, broad, smooth. 
7, 8, 9. P. Rigidus. {Rigid Pollicipes.) Posterior valves, with thin, transverse, prominent elevations; lateral 
valves elongated. 
10, 11. P. Radiatus. {Radiated Pollicipes.) Valves cuneiform, flat, with sharp, elevated rays diverging 
from their apices. 
12. P. Cornucopia. {Horn of Plenty Pollicipes.) 
13, 14, 15, 16, 17, 18. P. Maximus. {Large Pollicipes.) Terminal valves plain, rhomboidal, sometimes with 
central ridge and lines of growth ; posterior valve lanceolate, elongated, arcuated ; posterior valve, Figs. 13 and 
18, terminal; valve 17, anterior valve. 
19, 20, 21, 22, 23, 24. P. Lsevis. {Smooth Pollicipes.) Lateral valves rhomboidal, smooth, thin, flat. 
25, 26, 27, 28, 29, 30, 31, 32, 33, 34. P. Reflexus. {Reflected Pollicipes .) Posterior valve lanceolate, straight 
or recurved ; lateral valves flat, smooth. 
35, 36. P. Antiquus. {Ancient Pollicipes.) Posterior valves long, curved, narrow, with transverse striae ; 
lateral valve oblique, sub-quadrate ; striae triangular. 
37, 38, 39, 40, 41, 42, 43, 44, 45, 46. P.Minutus. {Minute Pollicipes.) Posterior valves elongated, straight; 
lateral valves triangular, with waved striae. 
47, 48. Coronula Diadema. {Crown-shaped Coronula.) Compressed, with six, prominent, longitudinally- 
ribbed valves, alternating with as many transversely striated ones. 
49. Balanus Tessellatus. {Chequered Balanus.) Obliquely conical, thin, with six, smooth valves; interstices 
finely tessellated ; aperture oval. 
50. B. Balanoides. {Acorn Balanus.) Sub-conic, sub-depressed, smooth; aperture wide; operculum, with 
two, anterior valves, with transverse striae; posterior valves smooth. 
51. B. Spongeosus. {Sponge Balanus.) Ovate, with six, angulated compartments ; three anterior divisions 
broad; surface wrinkled, and with many, spiniform processes; operculum four-valved, anterior pair, with 
strong, deep ridges, crossed by longitudinal striae; internal margins serrated; posterior pair long, sharp-pointed, 
arcuated; base of shell cup-shaped. 
52. 53, 54, 55, 56. B. Crassus. {Thick Balanus.) Oblique, thick, with six, smooth, obscurely-ribbed valves ; 
aperture triangular. 
57. B. Rugosus. {Rough Balanus.) Sub-conic, with six compartments ; posterior ones broadest, crossed by 
deep divisions, formed by lines of growth, sometimes wrinkled or striated longitudinally ; aperture large; inner 
margin transversely ridged. 
58. B. Punctatus. {Punctured Balanus.) Sub-conic, with indistinct compartments; with many, longitudinal 
ribs and several, transverse lines of growth; aperture wide ; operculum punctured. 
59. Adna Sulcata. {Furrowed Adna.) Sub-conic; with many, longitudinal, plain ribs ; aperture wide. 
60. B. Tintinnabulum. {Little Bell Balanus.) Obtusely sub-conic, with three, raised compartments, longi¬ 
tudinally striate, and three depressed ones, transversely striate ; aperture wide. 
61. Clitia Verruca. {Wart-like Clitia.) Depressed; compartments strongly ribbed diagonally, finely striated 
transversely; margin of base serrated ; aperture, closed by operculum. 
62. B. Costatus. {Ribbed Balanus.) Sub-conic, depressed; circular at base; with seventeen to nineteen, 
equidistant, smooth ribs, extending beyond basal margin; aperture small, sub-ovate. 
63. B. Communis. {Common Balanus.) Strong, rugged, conic ; compartments unequal, with many, longi¬ 
tudinal, squamous ribs ; interstices transversely wrinkled ; aperture contracted. 
64. Agnostus Pisciformis. {Fisli-shaped Agnostus.) 
65. Acidaspis Brightii. {Bright's Acidaspis.) 
66. A. Tuberculatus. {Tuberculated Agnostus.) 
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