1865.] DR. A. GUNTHER ON THE BRITISH SALMONOIDS. 
197 
42. Nerita longii, Récluz. 71. Natica petiveriana, Récluz. 
43. Littorina undulata, Gray. 72. Cyprea helvola, Linn. 
44. carinifera, Menke. 73. —— caput-serpentis, Linn. 
45. Clanculus unedo, A. Adams. 74. —— : 
46. Cerithium bornii, Sow. fae vitellus, Linn. 
47. Cerithidea rhizoporarum, 76. —— cicercula, Linn. 
A. Adams. 77 nucleus, Linn. 
48. 
Umbonium (new species). 
. Patella rudis. 
49. Triton pilearis, Lam. 79. Melania tenuisuleata, Dun- 
50. Planazxis sulcata, Lam. ker. 
51. Monodonta melanochloris, 80. Neritina interrupta, Récluz. 
Philippi. 81. Fasciolaria trapezium, Lam. 
92. 
Patella rudis. 
. Vertagus obeliscus, Brug. 
53. (young shells). 83. Helix swinhoii, Pfr. (new). 
54. achates, Reeve. 84 luhuana, Sow. 
55. argentea, Quoy & 85 mackenzii, Val. 
Gaim. 486 (new), allied to H. 
56. x chinensis. 
57. alpen ema 87. —== similaris, Férussac. 
58. argentea, Quoy & 88. , allied to no. 88. 
59. Gaim. 89. redfieldii, Pfr. 
60. Scutellina crenulata, Brod. 90. (new), allied to H. 
61. Patella testudinaria, Linn. trifasciata. 
62. Siphonaria cancer, Reeve. 91 melanostoma, Sow. 
63. Ostrea tulipa, Lam. 92. Cyclophorus, allied to C. ex- 
64. Mitra procissa, Reeve. altatus, Pfr. 
65. Pyrene discors, Gmel. 93. Limnea (new *). 
66. Conus flavidus, Lam. 94. Conus textilis, Linn. 
67. minimus, Linn. 95. Cerithium carbonarium, Phi- 
68. Columbella pardalina, Lam. lippi. 
69. Cyprea eglantina, Duclos. 96. —— bifasciatum, Sow. 
70. Natica ala-papilionis, Chem. 
Dr. A. Giinther gave an account of the present state of his re- 
searches into the British species of Salmonoid fishes, which he had 
undertaken whilst engaged in preparing the catalogue of the speci- 
mens of this family in the collection of the British Museum. Dr. 
Ginther stated that the genus Salmo was essentially an arctic group, 
inhabiting the northern portions of both hemispheres, and becoming 
more abundant in species upon receding from subtropical into tem- 
perate latitudes. Dr. Giinther was disposed to believe that the 
species of this genus to be found within British waters would be 
ultimately found to be much more numerous than had been hitherto 
suspected. From the materials at present at his command, he had 
already been able to distinguish what he believed would turn out to 
be four new species of the non-migratory group of true Salmo, be- 
sides identifying several others heretofore imperfectly distinguished. 
Dr. Giinther requested the assistance of the Fellows of the Society 
and their friends in furnishing him with series of specimens of our 
native Salmons and Trouts from every part of the British islands, 
