REFERENCE TO PLATES. 445 



FIGURE. PAGE. 



36. Mathilda cochlaeformis, Costa. Brugnone, Misc. Mai., 



f. 1 210 



37. Mathilda elegantula, Angas. Zool Proc.. t. l,f. 8, 1871, 210 



38. Mathilda quadricincta, Brocchi. Conch. Foss. subap., 



ii, t. 7, f. 6, 211 



C M C I D ^E. 

 PLATE 66. 



39. Shell of Caecum, much enlarged. Fischer, Man. de 



Conch., p. 698! 



a, spiral nucleus ; 6, first septum ; c, second septum ; 

 d, aperture, , .212 



40. Animal of Caecum. Forbes and Hanley, Brit. Moll., t. 



KK, f. 1, 212 



41. 42. Nucleus of Caecum. Jour, de Conch., t. 5, f. 1 a, 



16, 1877, 213 



43. Nucleus of Meioceras. Ibid., t. 5, f. 2, 1877, . . 214 



44, 45. Nucleus of Strebloceras. Ibid., t. 5, f. 3, 1877, . 214 

 46. Nucleus of Parastmphia. Ibid., t. 5, f. 4, 1877, . . 214 

 47-51. Different forms of the septum. Ibid., t. 4, figs. 13, 



17,21,23,25, 212 



52. Caecum laeve, C. B. ^d. Specimen, . . . .215 



53. Caecum farcimen, Cpr. Specimen, .... 215 



54. Caecum vitreum, Cpr. Specimen, . . . .215 



55. Caecum Clarkii, Cpr. (== vitreum, var.). Specimen, . 215 

 50. Caecum dextroversum, Cpr. Specimen, . . .215 

 57. Caecum glabrum, Mont. Forbes and Hanley, Brit. 



Moll.,t. 69, f. 5 215 



53. Caecum auriculatum, Folin. B. D. and D.,Moll. Rous- 



silon, 232, 216 



59. Caecum Achironia, Folin. Jour, de Conch., t. 3, f. 1, 



1867 216 



60. Caecum Someri, Folin. Ibid., t. 3, f. 2, 1867, . .216 



61. Caecum subimpressum, Cpr. Specimen, . . .217 



62. Caecum Floridanum, Stimpson. Specimen, . .217 



63. Caecum pulchellum, Stimpson. Tryon, Am. Mar. 



Conch., t. ll,f. 135, 217 



64. Caecum rhysotitum, Folin. Jour, de Conch., t. 2, f. 6, 



ISiiT, 218 



65. Caecum Cooperi, Carp. (= Californicum, Dall). Speci- 



men, . . .219 



PLATE 67. 



66. Caecum firmatum, C. B. Ad. Specimen, . . .217 



67. Caecum quadratum, Cpr, Specimen, .... 217 



