225 



39. U. CUNEATUS, R. 



paUilus, Lea. 



40. U. GIBBOSUS, R. 



perplexus. 



41. TJ. COSTATUS, R. 



peruvinnus? Lam. 

 U7idulatus, B. 



42. U. TERES, R. 



anodontoides, Lea. 



^^ ^^ 52. U. NEXUS, S. 



43. U. OHiENSis, R. (Anodonta.) arcoeformis, Lea. 



lavissimus, Lea. (Symphonota) 



infiatus? Lea. ( " ) var. 53. U. poi.itus, nob. 



suhrotundus, Lea. (not Raf.) 



48. U. APICULATUS, S. 



asper, Lea. 



49. U. LAPILLUS, S. 



fabalis, Lea. 



50. U. MONODONTUS, S. EatOH. 



soleju/ormisj Lea. 



51. U. METALLICUS, S. 



cuprinus, Lea. 



44. U. LATus, R. (Anod.) 



dehiscens, S. 

 oriens, Lea. 



45. U. HEROS, S. 



undulaius, S. 

 muK/plicatus, Lea. 



46. U. LUGUBRIS, S. 



ater, Lea. 

 atra, Desh. 



47. TJ. IJJTERRUPTUS, S. 



trapezoides, Lea. 



54. U. CICATKICOSUS, S. 



varicosus, Lea. 



55. U. PLiCATus, S. B. 



rariplicatus, Lam. Blainv.Desh. 



5Q. U. PARVUS, B. Eaton. 

 glans ? Lea. (var.) 



57. U. UNDATUS, B. 



trigonus, Lea. 



58. U. SUBROSTRATUS, S. 



iris. Lea. 



1. A. MARGINATA, S. B. 



U. ealceolus, Lea. 



ALASMODONTA. 



2. A. COSTATA, R. 



rugosa, B. Hildr. Eaton. 



3. A. COMPLANATA, B. Hildr. Eaton 



[From 4tli page of cover of p. iv.] 



Pecten vaeius, L.— A specimen of this shell was presented to me 

 several years since by Mr. Lesueur, as having been found by himself on 

 the Northeastern coast of the United States. I have not learned that 

 another has been obtained on our coast. 



It seems probable that Helix irrorata, is a variety of Helix lactea, 

 Mull., with which I compared it when describing it. I have a shell 

 from Rio Janeiro, presented by Mr. T. Peale, that corresponds in all its 

 character with the latter species. Mr. Hyde also sent me the same 

 shells, from near Buenos Ayres, so that the lactea, like the aspersa and 

 some of the smaller species, seems to be very widely distributed. 



Melania SEMrcARmATA, nob., pi. 47, add to the synonyms of this spe- 

 cies, M. acuta, Trans. Amer. Philos. Soc. vol. 4, N. S. 



