112 ^le-ssrs. \V. K. Parker and T. R. Jones on the 



bonate. A thick^ wcll-dcveloptd Crist eUaria Culcar : typical. 

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

 p. 476. 



Var. jS. PI. 11. figs. </-/. ("Planeus, Conch, p. 85, pi. 1. 

 fig. 12, STV, and fig. 13 z, Z ; Soldani, Sagg. Orit. pi. 1. fig. r/,G, 

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

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

 variety. 



Var. 7. PI. 11. figs. (j-h. Keeled, rowelled, bead-ribbed, and 

 umbonate. 



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

 7 and S are varieties of C. Calcur ornamented with granulated 

 septal lines. 



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

 fig. 6 J; Testaceogr. vol. i. pi. 59. figs, qq, rr.") Keeled, 

 rowelled, with irregular spikes, ribbed, umbonate ; surface gra- 

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

 narrow falciform chambers. 



Var. ^. PI. 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 (?;-i). "Recent: Adriatic and Mediterranean. 

 Fossil: Coroncina.^' Var. 77. PI. 12. figs, (j, h. (" Plancus, 

 Conch, p. 12, pi. 1. fig. 3 H.'^) Keeliess, ribbed, umbonate. 

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

 state. The same as C. viAulatu, Rohulinu simplex, &c. 



Var. 9. Pi. J 2. figs, i, k. Keeliess, slightly rowelled, ribbed, 

 and umbonate. Like the last, but rowelled. 



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

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

 ornamented variety like vars. 7 and 8, but smaller. 



Var. /c. PI. 13. figs, c, </. "Recent: Mediterranean.^' Keel 

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

 row. A variety of C. Culcar, faintly develo])ed as to its several 

 features. 



Var. X. PI. 13. figs. e-y. "Fossil: Coroncina.^' Slightly 

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

 6'. Calcar, with large-sized chambers. 



Var. fi. PI. 13. figs, h, i {k, /, section). " Recent : Mediter- 

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

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

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

 umbo. 



Cristellaria Calcar, of a symmetrical but limited gi-owth, 

 occurs early in the Secondary deposits, and is ol'ten abundant in 

 the clays of the U])per Trias, Lias, Oolites, Gault, and Chalk 



