Mr. F. P. Pascoe on some new Longicorns. 119 C. perversum are likewise larger in the Mediterranean than in our seas. Triton nodosum attains greater size at Malaga than at Vigo or further north, but is smallest in the Azores. Aclis supranitida grows larger at Madeira than in Britain. The southern forms of Mollusca appear to follow the same rule as the more northern. Murex brandaris, Cypraea lurida, and C. spurca, not recorded to have been found north of the Mediterranean, attain larger dimensions in the Canary Islands than in that sea. There are a few species the larger growth of which appears to be influenced by western longitude or Atlantic exposure. It has been remarked that Tellina balaustina is found larger in the Hebrides and on the west of Ireland than in the Mediterranean, where it is much more frequent. I have obtained it at Gibraltar of intermediate size ; and a valve dredged off Cape Finisterre in Spain was of the same size as the Scottish and Irish specimens. Lucina spinifera is found larger in the Hebrides and west of Ireland than elsewhere; upon the coast of North Drontheim it is quite as small as upon that of Spain. Solen siliqua, Lutraria elliptica, and some other species, are found of extraordinary dimensions in the outer Hebrides ; several others attain larger growth in Bantry Bay than on any part of the English coast. From the examples I have stated (and there would be no dif-ficulty in adducing more of a similar character) I think we may fairly come to the conclusion, that, although there are exceptions in both directions, and although the size attained by Mollusca may be influenced by various conditions in different localities, as a general rule, each species attains its greatest size, as well as greatest number, in the latitude best suited to its general deve-lopment ; and that, whether a species be Arctic, Boreal, Celtic, or Lusitanian, it will grow largest in the region to which it belongs. XII. On some new Longicornia from the Moluccas. By FRANCIS P. PASCOE, F.L.S. &c. IN Mr. Wallace's last collection from Batchian, in the Moluccas, there are about one hundred and fifty Longicorns, mostly new to science, but referable (with two or three exceptions) to genera which appear to be more or less frequent in the Indian Islands. The new forms, one of which resembles the South American genus Onychocerus in habit, and of which a second species is found in New Guinea (Aru), are confined to Mr. Wallace's pri-vate collection, and therefore, unfortunately, cannot now be described; but amongst the others there are a few species which are interesting either as indicating a more extended range of the
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