LAMELLIBRANCHIATA. 81 



Macrodon hirsonensis (d'Archiac) var. rugosa, J. Lycett, Supp. 

 Mon. Moll. Gt. Ool. etc. (1863), pi. xxxvi, f. 9, p. 113. Forest 

 Marble ; Farleigh. Walton Collection. 



Modiola arcadiformis, W. Keeping, Foss. Upware and Brickhill 

 (1883), pi. vii, f. 2 a, b, p. 128. Lower Greensand; Potton. 



M. ? consobrina, S. V. Wood, Eocene Bivalves I (1864), pi. xix 

 f. 17, p. 76. Bracklesham Beds; Alum Bay, Isle of Wight. 

 Fisher Collection. 



M. gibbosa, W. H. Hudleston, Proc. Geol. Assoc. v (1878), p. 489. 

 Coral Bag ; Malton. 



M. obesa, W. Keeping, Foss. Upware and Brickhill (1883), pi. 

 vi, f. 3 a, b, p. 117. Lower Greensand ; Upware. 



M. pedernalis ?, Roemer, W. Keeping, Foss. Upware and Brick- 

 hill (1883), pi. vi, f. 2 a, b, p. 117. Lower Greensand; Upware. 



M. sp., W. Keeping, Foss. Upware and Brickhill (1883), p. 118. 

 Lower Greensand; Upware. 



Modiolopsis gradata (Salter). M. nilssoni (Hisinger), F. McCoy, 

 Brit. Palaeoz. Foss. (1852), pi. i I, f. 21, p. 267. Lower Ludlow; 

 Park Lane, Llandeilo. 



M. homfrayi, H. Hicks, Q. J. G. S. xxix (1873), pi. v, f. 16, 17, 

 p. 49. Tremadoc Beds; Ramsey Island. Presented by Dr 

 H. Hicks. 



M. inflata, F. McCoy, A. M. N. H. ser. 2, vn (1851), p. 58, and 

 Contrib. Brit. Pal. (1854), p. 193, and Brit. Palseoz. Foss. (1852), 

 pi. i i, f. 16, p. 266. Middle Bala; Pen Gerrig, Serth, 



M. modiolaris (Conrad), F. McCoy, Brit. Pateoz. Foss. (1852), 

 pi. i i, f. 17, 18, p. 267. M. m'coyi, J. W. Salter, Appendix to 

 A. C. Ramsay, Geol. North Wales (1866), p. 346, and ibid. 

 second edition (1881), p. 552. Middle Bala; fig. 17 Cader 

 Dinmael,Jig. 18 Horderley. 



M. nilssoni, v. Modiolopsis gradata. 



M. planata, Salter, Cat. (1873), p. 182. Upper Ludlow; Kirkby 

 Moor, Kendal. 



M. planata, var., Salter, Cat. (1873), p. 182. Upper Ludlow; 

 Benson Knot. 

 w. C. 6 



