ADDITIONS AND CORRECTIONS 547 



Page 2, line 11, (et passim,) for "Imperator," read "Uvanilla." 

 Page 7, line 2 from bottom, (et passim,) for " Spondylus 



Lamarckii," read "Spondylus calcifer." 

 Page 13, line 12, 13, for "in", read "testa." 



,, 15, for "pyriforme," read "pyriformi." 

 Tablet 53, add "also 1 fine sp. in its burrow." 



Page 15, note, line 3. This is G-. cuneiformis (Spengl.) D' Orb., 

 Martinique : B. M. Cat. Cub. Moll. p. 35, no. 421. 



Species 24, Synonyms, read " = Petricola bulbosa, Gld. 

 Mex. fy Cal. Shells, p. 16, pi. 15, f. 5.= Petricola sinuosa, 

 Conr. Journ. Ac. Nat. Sc. Phil. Jan. 1850. Comp. Choris- 

 todon typicum, Jonas, in Zeit. f. Mai. 1844, p. 185, (St. 

 Thomas, W. I.)" 



After tablet 68, add "68*, a young sp. in situ in Spondylus 

 calcifer, with burrows of 4 others : also a fragment of Spondy- 

 lus with burrows of 3 Petricolse and a Grastrochama." For 

 "A burrow," &c. read "A specimen in situ will be found on 

 tablet 443." 



Page 19, line ^from bottom. Instead of the fragment on tablet 

 71 is deposited a valve since found on Spondylus of the same 

 species. In colour and general appearance it resembles* 

 P. robusta, jun., but the radiating ribs are very much closer, 

 when young grouped in the V pattern, and underneath 

 shewing concentric ridges of growth. Hinge with two long 

 posterior teeth, and a gap where an anterior tooth may have 

 been. A very young valve is nearly smooth and transparent 

 near the umbo ; afterwards ribbed. Long. "35, lot. '28, 

 alt. (valv. un.) *1. 



Page 21, line 3 from bottom, for "27," read "27." The species 

 is probably Corbula alba, Phil. : see page 534, no. 1. 



Species 34. Corbula , sp. ind. (a), allied to Corbula 



scaphoides, Hds. Tablet 79 contains the fragments of Mr. 

 Hanley's sp. 



Page 24, line 9, for "increscentium," read "incrementi." 



Page 25, Insert Species "685, TYLEEIA FRAGILIS, H. fy A. Ad. 

 Gen. vol. ii. p. 368, pi. 97, fig. 3, 3#." A minute examination 

 of the specimen has entirely removed all doubts of its unique 

 character. The hinge tooth appears to have been of Myoid 

 shape, but is broken. The clavicle, instead of proceeding 

 vertically as in Periploma, &c. is curved round and supported 



