112 Messrs. W. K. Parker and T. R. Jones on the 



bonate. A thick, well-developed CristeUaria Calcar : typieal. 

 See Annals N. H. 2 ser. vol. xix. p. 290; and ibid. 3 ser. vol. iii. 

 p. 476. 



Var. yS. PI. 11. figs. d-f. (" Plancus, Conch, p. 85, pi. 1. 

 fig. 12, STV, and fig. 13^, Z ; Soldani, Sagg. Orit. pi. 1. fig. ff,G, 

 Testaceogr. vol. i. pi. 33. fig. B.") Keeled, ribbed, and umbo- 

 nate. CristeUaria cultrata of authors : a common well-developed 

 variety. 



Var. 7. PL 11. figs. g-h. Keeled, rowelled, bead-ribbed, and 

 umbonate. 



Var. 8. PI. 11. figs. i-k. Keeled, rowelled, and bead-ribbed. 

 7 and 8 are varieties of C. Calcar ornamented with granulated 

 septal lines. 



Var. e. PI. 12. figs. a-c. ("Soldani, Sagg. oritt. p. 98, pi. 1. 

 fig. 6 J ; Testaceogr. vol. i. pi. 59. figs, q q, r r.") Keeled, 

 ro welled, with irregular spikes, ribbed, umbonate ; surface gra- 

 nulate and chambers narrow. A fine variety of C. Calcar, with 

 narrow falciform chambers. 



Var. f. PL 12. figs. d-f. "Fossil: Ripalta, near S. Quirico, 

 in the Sienese." Keeled, ribbed, umbonate ; last few chambers 

 distorted. C. cultrata : a modified individual. 



Three varieties (ni). "Recent: Adriatic and Mediterranean. 

 Fossil: Coroncina." Var. 77. PL 12. figs, g, li. ("Plancus, 

 Conch, p. 12, pi. 1. fig. 3 H.") Keelless, ribbed, umbonate. 

 The most common variety of C. Calcar in its less-developed 

 state. The same as C. rutulata, Robulina simplex, &c. 



Var. 0. PL 12. figs, i, k. Keelless, slightly rowelled, ribbed, 

 and umbonate. Like the last, but rowelled. 



Var. i. PL 13. figs, a, b. Keeled, slightly rowelled, bead- 

 ribbed, the granulate septal lines meeting at the umbo. An 

 ornamented variety like vars. 7 and S, but smaller. 



Var. K. PL 13. figs, c, d. "Recent: Mediterranean." Keel 

 slight, with some teeth ; ribs faint ; no umbo ; chambers nar- 

 row. A variety of C. Calcar, faintly developed as to its several 

 features. 



Var. X. PL 13. figs. e-g. "Fossil: Coroncina." Slightly 

 keeled, faintly ribbed, umbonate ; chambers large. A variety of 

 C. Calcar, with large-sized chambers. 



Var. IJL. PL 13. figs, h, i (k, /, section). " Recent : Mediter- 

 ranean. Fossil : Coroncina." Sharply rowelled, faintly ribbed, 

 largely umbonate. The exogenous shell-substance in this va- 

 riety of C. Calcar forms long sharp keel-teeth, and a large 

 umbo. 



CristeUaria Calcar,, of a symmetrical but limited growth, 

 occurs early in the Secondary deposits, and is often abundant in 

 the clays of the Upper Trias, Lias, Oolites, Gault, and Chalk. 



