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COREIGEXDA. 239 



Page 

 T. snlcataria. Lam. PI. xr?i, fig. 8 ; pL xxriii, fig. 3 . ' . 135 



T. Vicarvana, Lye. PI. ixv, fig. 9 ; pL xxTiii, figg. A,Aa; pi. sL Sgs. 3, 4 



141, 203 



L. — {tar.) PI. isT,%. 8 . . . . 141 



fT. affinis, J/i7/. PI. il, fig. 2 ; pi. sii, fig. 7 . .18/ 



GLABKi J T. debilis. Lye. PI. xl, figs. 8, S ay pi. xli, fig. 5 . 189 



I T. Donscombensis, iyc. PL xl, figs. 5, 6 ; pL xli, fig. 4 1 188 



1^ T. laeviascnla. Lye. PI. rrii, fig. 6 . . . . .96 



BYssiF£K.i; T. carinata, J^. PI. nxr, fig. 3 (Ventnor) .... 179 



Note. — Subsequently to the completion of this Jlonograph 'Sli. Witchell kindly fonrarded to me a 

 variety of T. gemmata, PI. I, fig. 7, p. 15, which I propose to designate by the varietal name bifera. It 

 haa seven rows of concentric costae, which occupy more than half the height of the valve. The oblique or 

 perpendicular costae, nine in number, have three only which originate at the marginal carina ; all the 

 others proceed from the last-formed concentric costa to the pallial border ; the general figure is somewhat 

 shorter than the typical form. Both varieties have occurred very rarely in a freestone bed of the Upper 

 Trigonia Grit of the Inferior Oolite in the vicinitr of Stroud. 



COKRIGEXDA. 



Page 



11 (Introduction). For the general sketch of the distribution of British Trigoniae commencing at this 

 page iuhgtitufe the revised stratigraphical table of their distribution at the end of the 

 Monograph, p. 235. 

 23, line 4. Erase T. Bronnii. Ag.. pi. iv, fig. 8, and suistifvte T. elaceliata, Ag., young specimen. See 

 also p. 209 for description and figures of T. Brotmii, Ag. 



42. Title to T. ineurea. Ben., alter fig. 2 to T. Alina, Cent., var. Alter also explanation, fig. 2, facing 



pi. ix ; make it T. Alina, Cent. It is also corrected npon the stradgTsiphical table, p. 237. 

 Eefer these to T. ineurra and to T. Alina. 



43. Erage line 26, commencing " \o. 2 has suffered," to the word "pointed " at end of the sentence. 

 52. For T. coneentriea, Ag., see p. 206. 



59, line 4. Read few examples ot Trigonia paueieosta have occurred at that locality. 



62, line 7. For Xorthamptonshire read Oxfordshire at Hook Norton ; see PI. XXXTII, figs. 1, 2. 



69. T. geographica, Ag. ; see also PL XXXII, fig. 9. 



74. Erase the concluding sentence of the description of X. Carrei, which refers to an unsatisfactory and 



doubtful specimen not figured. 

 77. T. undulata. From., var. arata. Pis. XYI and XVII; see also p. 201 for figures of the typical form 



of T. undulata. 

 84. T. gibbosa. Sow. Erase PI. XYIII, fig. 3 : also PL XIX, figs. 1, 1 a, 1 b. The references facing the 



plates are correct. 

 88. T. Damoniana, de Lor. Erase PI. XX, figs. 1, 2, 2 a, 2 b, substitute PL XXI, figs. 2, 3, 4, 5, 2 a, 



2 b. The references facing the plates are correct. 

 91. T. Beesleyana, Lye. Additional well-preserved specimens exhibit a narrow, lengthened, depressed 



space upon the superior border, representing the escutcheon ; the posteal slope, therefore, 



represents the area with its delicate transverse costeBas. There are no carinal elevations. 



