Terebratula. 
MOLLUSCA. 
139 
Carboniferous Limestone, Ireland; Devonian Shales, 
Plymouth and Newton. 
94. Terebratula dimidiata. —The Divided Terebratula, 
pi. LVI.* fig. 22, 23. 
T. dimidiata. Sower by, III. p. 138, pi. 277, fig. 5. 
Transversely obovate, and subcomprcsscd, and wider than 
long; beak straight, a little produced ; upper valve convex; 
surface with about thirty plaits, the half of which on one sido 
elevated, producing the appearance of being medially divided. 
Its straight beak and greater width than length distinguish it from 
T. inconstans. 
Greensand, Haldon. 
95. Terebratula peotita. —The Little-Comb Terebra- 
tula, pi. LVI. fig. 88, 89. 
T. peel it a. Sowerby, II. p. 87, pi. 138, fig. 1. Brongniart 
Env. de Paris, pi. 9, fig. 3. 
Suborbicular; gibbose ; with a medial hollow, extending 
from the beaks to the base ; beak considerably produced and 
slightly incurved ; surface with very numerous longitudinal 
rounded striae, which are frequently furcated towards the 
base. 
Under Greensand, Warminster and Swanage Bay. 
96. Terebratula seminula. —The Little Seed Tcrebra- 
tula, pi. LY.* fig. 6, 7. 
T . seminula. Phillips, II. p. 222, pi. 12, fig. 21, 22, 23. 
Nearly orbicular; beak rather pointed, perforation very 
small; surface smooth, with one lateral plait. 
Carboniferous Limestone, Bolland. 
98. Terebratula antiquata. —The Ancient Terebratula, 
pi. LY.* fig. 17, 18. 
T. antiquata. Phillips, II. p. 223, pi. 11, fig. 20. 
Oblong-oval, beak prominent; hinge line nearly parallel; 
base rounded; upper valve plane, with two ribs emanating from 
the combs, and divergent; lower valve convex; surface smooth. 
Carboniferous Limestone, Bolland. 
99. Terebratula penivedra. —The Pentagonal Terebra¬ 
tula, pi. LV.* fig. 19, 20. 
T. pentcedra. Phillips, II. p. 221, pi. 12, fig. 3. 
Pentagonal; compressed ; beak rather large, the perforation 
minute ; front and sides emarginate; surface undulated. 
Carboniferous Limestone, Bolland. 
100. Terebratula lentifoiimis. — The Lens-shaped 
Terebratula, pi. LY.* fig. 23, 24. 
T. lenliformis . Woodward, Geo. Nor. pi. 6, fig. 11. 
Nearly orbicular, slightly lenticular; beak small, perforation 
minute; surface smooth. 
Upper Chalk, Norwich. 
101. Terebratula ruomboidea. —The Rhomboidal Tere¬ 
bratula, pi. LV * fig. 29, 30, 38, 39. 
T . rhomboidce. Phillips, II. p. 222, pi. 12, fig. 18, 19, 20. 
Ib. Pall. Foss. p. 88, pi. 35, fig. 158. 
Subrhomboidal ; beak large and rounded, perforation minute, 
destitute of lateral plaits. 
Carboniferous Limestone, Bolland and Whitehall. 
102. Terebratula obsoleta. —The Obsolete Terebra¬ 
tula, pi. LVI. fig. 90. 
T. obsoleta. Sowerby, I. p. 192, pi. 83, fig. 7. 
Almost orbicular, gibbose ; centre of the front a little elevated 
by seven plaits ; beak produced; sides with from seven to 
eleven sharp plaits; depth about two-thirds the length. 
103. Terebratula pentagonalis. —The Pentagonal Tere¬ 
bratula, pi. LY.* fig. 14, 15. 
T. pentagonalis. Phillips, I. p. 91, pi. 1, fig. 17. T. pen - 
langulata . Woodward, Geo. Nor. p. 54, pi. 6, fig. 10. 
Pentagonal; beak but slightly produced ; sides nearly paral¬ 
lel ; a shallow mesial furrow, extending from the beak of the 
larger valve to the base; small valve depressed in the centre ; 
baso concave in the centre; surface smooth. 
Under Chalk, Dane’s Dike and Hartford. Red Chalk, 
Hunstanton. 
104. Terebratula lineolata. —The Lined Terebratula, 
pi. LY.* fig. 32. 
T. lineolata. Phillips, I. p. 95, pi. 2, fig. 27. 
Subquadrate, beak considerably produced ; slightly incurved, 
sides moderately rounded; base with a broad central projec¬ 
tion ; surface with rather wide divergent striae or linea- 
tions. 
Specton Clay, Speeton and Knapton. 
105. Terebratula con vex a. —The Convex Terebratula, 
pi. LY.* fig. 50, 51. 
T. conrexa. Sowerby, Geo. Tr., 2d Ser. IY. p*. 339, pi. 
14, fig. 12. 
Subtriangular, sacculiform; beak large, considerably pro ¬ 
duced and slightly incurved ; angles rounded ; valves regularly 
convex ; front a little elovated; surface with numerous diver¬ 
gent slightly rounded ribs. 
Lower Greensand, near Hythe. 
106. Terebratula elegans. —The Elegant Terebratula, 
pi. LY.* fig. 75, 76. 
T. elegans. Sowerby, Geo. Trans. 2d Ser. IY. p. 338, pi. 
14, fig. 11. 
Transversely obovate, or nearly orbicular ; beak prominent, 
acute, almost straight; front a little elevated and straight 
surface with numerous sharp, divergent, narrow ribs. 
Lower Greensand, Lvmpne, Kent. 
107. Terebratula faba. —The Bean-shaped Terebratula, 
pi. LIV.* fig. 20, 21. 
T. faba. Sowerby, Geo. Tr. 2d Ser. IY. p. 338, pi. 1*, 
fig 10. 
Longitudinally elliptical, narrow, gibbose; beak short but 
prominent; front concave, but not elevated ; surface smooth. 
Lower Greensand, near Folkstone. 
108. Terebratula parvirostris. —The Short-Beaked 
Terebratula, pi. LY.* fig. 83, 84. 
T. parvirostris. Sowerby, Geo. Tr. 2d Ser. IY. p. 339, pi. 
14, fig. 13. 
Slightly tetrahedral, orbicular; beak small and acute; sides 
angular, and slightly produced ; surface w ith numerous angular 
divergent ribs, eight or nine of them considerably elevated 
in front. 
Lower Greensand, East of Shanklin. 
109. Terebratula dilatata. —The Enlarging Tere¬ 
bratula, pi. LYI. fig. 70, 71. 
T. dilatata. Sow'erby, Geo. Trans. 2d Ser. IY. p. 343, pi. 
18, fig. 2. 
Transversely elliptical, imperfectly trilobate; central lobe 
elevated ; beak of the larger valve short and large, with the 
point considerably incurved and sharp; surface with about 
fifty sharp divergent plaits, giving the whole external margin 
a serrated appearance. 
