225 
39. U. CUNEATUS, R. 
patulus, Lea. 
48. U. APICULATUS, S. 
asper, Lea. 
40. U. GIBBOSUS, R. 
perplexus. 
49. U. LAPILLUS, S. 
fahalis, Lea. 
41. 
U. COSTATUS, R. 
peruvianus? Lam. 
undulatus, B. 
50. 
51. 
42. 
U. TERES, R. 
anodontoides, Lea. 
52. 
43. 
U. OHiENSis, R. (Anodonta.) 
Icevissimus, Lea. (Symphonota) 
inflatus ? ijQ 2 u. ( “ ) var. 53. 
44. U. LATUS, R. (Anod.) 
dehiscens, S. 54. 
oriens, Lea. 
U. MONODONTUS, S. Eaton. 
soleniformis^ Lea. 
U. METALLICUS, S. 
cuprinus, Lea. 
U. NEXUS, S. 
arcceformis^ Lea. 
U. POLiTus, nob. 
subrotundus^ Lea. (not Raf.) 
U. CICATE.ICOSUS, S. 
varicosus^ Lea. 
45. U. HEROS, S. 
undulatus^ S. 
multiplicatusy Lea. 
46. U. LUGUBRIS, S. 
ater, Lea. 
atra^ Desh. 
47. U. INTERRUPTUS, S. 
trapezoides^ Lea. 
55. U. PLiCATUS, S. B. 
rariplicatuSj Lam. Blainv.Desh. 
56. U. PARVUS, B. Eaton. 
plans? Lea. (var.) 
57. U. UNDATUS, B. 
trig onus ^ Lea. 
58. U. SUBROSTRATUS, S. 
iris, Lea. 
ALASMODONTA. 
1. A. MARGINATA, S. B. 2. A. COSTATA, R. 
U. ealceolus, Lea. rugosa, B. Hildr. Eaton, 
3. A. COMPLANATA, B. Hildr. Eaton. 
[From 4tli page of cover of p. iv.] 
Pecten vARrus, L. — A specimen of this sLell was presented to me 
several years since by Mr. Lesnenr, as Laving 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 semtcarinata, nob., pi. 47, add to the synonyms of this spe- 
cies, M. acuta, Trans. Amer. Philos. Soc. vol. 4, N. S. 
