TAB. XLIII. 



FIG. 



1, 1 a. Myacites modica, Bean, sp. Cornbrash (page 83). 



2, 2 a. Homomya gibbosa, Sow., sp. (Page 88.) 



3, 3 a. Pholadomya lyrata, Sow. Cornbrash (page 87). 



4, Thracia amygdaloidea, Lye. Great Oolite (page 80). 



5, 5 a. Horoomya crassiuscula. An adult specimen, with the test preserved. Part II, 



page 112; Supplement, page 89. 



