Reference to plates. 445 



FIGURE. PAGB. 



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



f. I, 210 



3T. Mathilda eleg;intula,Anoras. Zool Proc, t. l,f. 8, 1811, 210 



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



ii, t. 7, f. 6, 211 



C ^ C I D ^. 



Plate 66. 



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



Conch., p. 698. 

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

 d, aperture, . . . . . . . .212 



40. Animal of Caecum. Forbes and Hanle}-, Brit. Moll., t. 



KK, f. 1, 212 



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



16, 18TT, 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 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. Cfecum 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 dextroversura, Cpr. Specimen, . . .215 



57. Caecum glabrnm, Mont. Forbes and Hanle}', Brit. 



Moll., L 69, f. 5 215 



58. 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. Ca?cum 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. Trj^on, Am. Mar. 



Conch., t. 11, f. 135 217 



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



18!l7, 218 



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



men, 219 



Plate 67. 



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



67. Cctcum quadratum, Cpr. Specimen, .... 217 



