Glabe.1; - 



CORRIGENDA. 239 



PAGE 



T. sulcataria, Lam. PI. xxvi, fig. 8 ; pi. xxviii, fig. 3 . . . 135 



T. Vicaryana, Lye. PI. xxv, fig. 9 ; pi. xxviii, figs. 4, 4 a; pi. xl, figs. 3, 4 



141, 203 

 'L — {var.) PI. xxv, fig. 8 . . . . 141 



187 

 189 

 188 

 96 

 179 



fT. affinis, Mill. Pi. xl, fig. 2 ; pi. xxi, fig. 7 . 

 T. debilis. Lye. PI. xl, figs. 8, 8 a ; pi. xli, fig. 5 

 T. Dunscombensis, Lye. PI. xl, figs. 5, 6 ; pi. xli, fig. 41 

 T. Iseviuscula, Lye. PI. xxii, fig. 6 . 

 Byssifeb/E T. carinata, Ag. PI. xxxv, fig. 3 (Ventnor) 



Note. — Subsequently to the completion of this Monograph Mr. Witchell kindly forwarded to me a 

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

 has 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 vicinity of Stroud. 



CORRIGENDA. 



PAGE 



1 1 (Introduction). For the general sketch of the distribution of British Trigonise commencing at this 

 page substitute 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 substitute T. clavellata, Ag., young specimen. See 

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



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



pi. ix ; 7nake it T. Alina, Cont. It is also corrected upon the stratigraphical table, p. 237. 

 Refer these to T. incurva and to T. Alina. 



43. Erase line 26, commencing " No. 2 has suffered," to the word " pointed " at end of the sentence. 

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



59, line 4. Bead few examples ot Trigonia jtaucicosta have occurred at that locality. 



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



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



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



doubtful specimen not figured. 

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



of T. undulata. 

 84. T. gihbosa, Sow. Erase PI. XVIII, fig. 3 ; also PI. XIX, figs. \,\a,\b. The references facing the 



plates are correct. 

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



2 b. The references facing the plates are correct. 

 9 1 . r. 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 costellae. There are no cariual elevations. 



