62. Bulla ampulla, Linne.

II. Conchifera

63. Dione florida, Lamarck.
64. Dione sp.
65. Tellina staurella, Lamarck.
66. Paphia glabrata, Gmelin.
67. Chama Ruppellii, Reeve.
68. Arca (Barbatia) sp.
68a Arca (Senilia) sp.
69. Cardium leucostoma, Born.
70. Venericardia Cumingii, Deshayes.
71. Modiola auriculata, Krauss.
72. Pectunculus lividus, Reeve.
73. Pectunculus pectenoides, Deshayes.
74. Avicula margaritifera, Linne.
75. Tridacna gigas, Linne.





Chapter XV.
The Southern Sulphur-hill--the Cruise to El-Haura--Notes on the
Baliyy Tribe and the Volcanic Centres of North--Western Arabia.



On the day of our arrival at El-Wijh I sent a hurried letter of