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species of Mytilas and Pirnia, in MS. No. 3 there ave three 

 speeies of Mytilus and four of Pinna; iu the public Collection 

 there are four species of Mytilus and four of Piuua. 



fn) MSS. No. 1, 2, aucl 4, enumerace three species of 

 Lima;MS. No. 3 meuLious four species which are found in 

 the public Collection. 



(o) MSS. No. 1, 2, aud 4, iu the Class of Pteropoda, 

 enumerate only the Creseis spinifera, Rang, the Brochus 

 tracheiformis, Brown, aud three species of Hyalsea; in the 

 public Collection and in Mr. Mamo's private one, there are, 

 besides the same number of species of Hyalsea, four species 

 of Cleodora, including the sub-genus Creseis, and the Coecum 

 sive Brocus tracheiforme, which is considered by Woodward 

 and other Conchologists as a Gasteropod. 



(pj There are as many alterations in the class of Gas- 

 teropoda. In the family of the Tritoniacea, MSS. 1 and 4 

 mention only the Thetys fimbria, Auctorum, of which only 

 one specimen has been caught, and thres species of Doris, 

 of which one is the D. granulata, Mr. Mamo's. MS. No. 2 

 mentions four species including the D. marmorea. Mr. Ma- 

 *mo's, of which a description is given, and amongst the loose 

 papers I have found a rifth species the D. elephantina, noted 

 also as discovered by Mr. Mamo, which he described. MS. 

 No. 2 mentions and describes also the Aeolis capitata, which 

 is also noted as Mr. Mamo's. 



(q) The four MSS. enumerate seven species of Bulla; in 

 the public Collection there are only six. 



(r) In MS. No. 3 are mentioned three species of Limax, 

 of which in the public Collection there is only one. 



(s) The four MSS. mention sixteen species of Helix; 

 in the public Collection there are fifteen species. 



(0 In MS. No. 3 there are mentioned nineteen species 

 of Trochus, six species of Fusus, six species of Murex, 

 and twelve species of Buccinum; in the public Collection 

 there are mentioned eighteen species of Trochus, five of 

 Fusus, seven of Murex, and ten of Buccinum. 



(a) In the puhlic Collection there is the Atlanta Costae, 

 which is not mentioned in any of the MSS. I do not deem 



