ADDITIONS AND CORRECTIONS 547 
Page 2, line 11, (eé passim,) for “Imperator,” read “Uvanilla.” 
Page 7, line 2 from bottom, (et passim,) for ““ Spondylus 
Lamarckii,” read “Spondylus ealcifer.” 
Page 13, line 12, 13, for “in”, read “testh.” 
re » 15, for “pyriforme,” read “nyriformi.” 
Tablet 53, add “also i fine sp. in its burrow.” 
Page 15, note, line 3. This is G. cuneiformis (Spengl.) D’ Ord., 
Martinique :—B. MV. Cat. Cub. Moll. p. 35, no. 421. 
Species 24, Synonyms, read “ = Petricola bulbosa, Gild. 
Mex. § Cal. Shells, p. 16, pl. 15, f. 5.=Petricola sinuosa, 
Conr. Journ. Ac. Nat. Se. Phil. Jan. 1850, Comp. Choris- 
todon typicum, Jonas, in Zeit. f. Mal. 1844, p. 185, (St. 
Thomas, W. I.)” 
After tablet 68, add “68*, a young sp. in situ in Spondylus 
ealcifer, with burrows of 4 others: also a fragment of Spondy- 
lus with burrows of 3 Petricole and a Gastrochena.” For 
“A burrow,” &. read “A specimen in situ will be found on 
tablet 443.” 
Page 19, line 3 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, lat. °28, 
alt. (valv. un.) *1. 
Page 21, line 3 from bottom, for “2°7,” read °27.” The species 
is probably Corbula alba, Pil. + 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 2A, line 9, for “Inerescentium,” read “incrementi.” 
Page 25, Insert Species “685, TytErra FRAGILIS, H. & A. Ad. 
Gen. vol. ii. p. 368, pl. 97, fig. 3, 3a.” 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 
