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Show 1878.] 'LIGHTNING'AND ' PORCUPINE ' EXPEDITIONS. 397 Second Cruise. Mediterranean. No. of Station. 40. 41. 45. 50. 50 a. 51. 54. 55. 58. North Latitude. West Longitude. Algesiras Bay, Gibraltar. 0 ; 36 0 35 57 35 36 o / 4 40 4 12 2 29 Capo de Gata. Cartagena Bay. 1 Algerine Coast. \ Off Jijeli. E. Long. 36 55 1 10 37 41 6 27 37 30 6 51 Gulf of Bona. Benzert Boad. Rasel Amoush. Gulf of Tunis. Adventure Bank. Off Rinaldo's Chair. 36 43 | 13 36 Depth in Fatboms. 1-15 586 730 207 40-69 60-84 5-51 152 40-80 1415 1508 1456 25 40-65 45 25-85 30-92 60-160 266 Bottom Temperature. 55-0 550 54-7 54-7 55-0 550 56-5 Very few productive deep-sea dredgings were made during this second cruise. Some of the new and peculiar species of Mollusca, which were procured in these expeditions, have been already described and noticed by m e in the fifth volume of ' British Conchology,' the ' Proceedings of the Royal Society,' and the ' Annals and Magazine of Natural History.' I will now endeavour to complete the work, and to record all the species, with particulars of their geographical, bathymetrical, and geological distribution. Figures of the more remarkable species will also be given. I commence with the class usually regarded as lowest in the scale-of organization, or the least-specialized, among the Mollusca, viz. the BRACHIOPODA. Notwithstanding the long and persevering labours of that monarch of Brachiopodists, M r . Davidson, as well as of Professor King, Mr. Dall, and other excellent zoologists, the natural arrangement and coordination of this difficult class cannot be said to be yet satisfactorily established. I prefer to steer a middle course between extreme systematists, and not to follow Professor King in making Terebratula cranium the type of another genus (his Macandrevia), nor to compress all the family of Terebratulidce into the single genus Terebra- |