550 ADDITIONS AND COBRECTIONS 



Tahlei 498 contains, vritli the fragments of tlie hroten valve, a 

 rather larger, opposite valve, also brolc-n. This has no car- 

 dinal tooth ; the ligament remains, filling the space under 

 the umbo ; and the concentric undidations are fainter. 



TaUet 503. Instead of the fragment, is a perfect valve since 

 found, with the ligament pit normal ; whether conspecific 

 with the other valve is doubtful. 



Page 115, line lo,for "irregular," read "regular." 



Spedesim,addto si/noni/ms, "Comp. Anodouta glauca. Val. 

 Rec. Obs. vol. ii. p. 236, pi. 50, i. 2." Dr. Gray thinks it 

 probable that the species is an Iridina. 



Page 124. Tablet 2530 qoutains a small pair of "Xo. 695, 



Crexelia , sp. ind. " ; in shape somewhat resembling 



Jlodiola Brazdiensis, but with the epidermis hairy on the 

 posterior part, where it lies in radiating lines, whde it is 

 concentric on the anterior, decussated towards the middle. 

 Found on Spondjdus calcifer. Long. -075, lat. 'OS. 



Page 131, lines 28, &c., read "Tablet 605 contains the original 

 sp. of Leiosolenus spatiosus, presented by E. D. Darbishire, 

 Esq. One since found measures long. 2,-;3, lat. '7, alt. '7. 



Spenies 184, add to s?/nonyms, "Yar. P=Arca trapezia, Desk in 

 Rev. Cuv. Soc. 1839, p. 358:— G^«er. 3fag. Zool. 1840, pi. 21. 

 San Bias." 



Page 148, last line, ^c, for "Discoporsea" read "Defrancia." 



Species 201 should stand as '■Margabitipiiora fimbrivta, Dkr. 



Avicula (Meleagrina) nmbriata, Dkr. in Zeit.f 3Ia I.' lSo2', 



p. 79, no. 13. Central America." 



Species 212. Ostrea Canadensis is distinct, teste Gould. 



Species 214, b. The examination of additional specimens con- 

 firms the opinion that Ostrea paluula is a distinct species. 



Species 220 is probably a Naranio : See page 529. 



Page 176, line 8 from bottom, after "f. 1," add "a, b." 

 ., 177, line 3 from bottom, add "p. 24.7, pi. 56, f. 1, a, b." 



Species 240. Add " = Siphonaria cTquUorata, [Rre. quasi] 

 C^ra.?/ ms., Riw. Condi. Ic. pi. 4, sp. 15. f. 15 a, b. Vide Brit. 

 Assoc. Eep. 1857, p. 290, note *." 



Species 212. Add to Hab. "Sandwich Islands, JSfuttall." 



Species 255 should he "Mac-Axdre.e." 



Page 199, dele line 2 from bottom. Dr. Gould's shell is the 



