REFERENCE TO fLATES. 445 



FIGURE. PAGE. 



36. Mathilda cochlseformis, 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 JE C I D M. 

 PLATE 66. 



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



Conch., p. 698. 



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

 rf, 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. la, 



16, 1877, : 213 



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



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

 46. Nucleus of Parastrophia. 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. Ad. Specimen, . . . .215 



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



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



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



56. Caecum dextroversum, Cpr. Specimen, . . .215 



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



Moll.,t. 69, f. 5 215 



58. Caecum auric ulatum, Folin. B. D. and D.,Moll. Rons- 



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. 11, f. 135, 217 



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



18(57, . . .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 



