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Show 292 MR. A. G. BUTLER ON A N E W FOSSIL MOTH. [May 21, The elytra, when seen without a lens, have a mottled appearance, and the darker portions or spots are of more or less intensity in the different specimens ; the underside is always very dark. MALACOSOMA OLIVACEUM, Fabr. Corozal. MALACOSOMA ENCAUSTICUM, Germ. Colonia Tovar and San Esteban. 2. Description of a new Genus of Fossil Moths belonging to the Geometrid Family Euschemidee. By A R T H U R G. BUTLER, F.L.S., F.Z.S., Assistant-Keeper, Zoological Department, British Museum (Nat. Hist.). [Received May 18, 1889.] (Plate XXXI.) I have to thank Mr. Robert Etheridge for showing me, and Dr, Henry Woodward for giving m e permission to describe, an exceedingly interesting Moth from the Eocene Freshwater Limestone of Gurnet Bay, Isle of Wight; collected by Mr. E. J. A'Court Smith. This is one of the insects found in the Tertiary Nodules on the beach. In his paper published in 1879 (Quart. Journ. Geol. Soc. vol. xxxv. pp. 342-3), and entitled " On the Occurrence of Branchi-pus (or Chirocephalus) in a Fossil State, associated with Eospliceroma and with numerous Insect-remains, in the Eocene Freshwater (Bem-bridge) Limestone of Gurnet Bay, Isle of Wight," Dr. Woodward says :- "To Mr. E. J. A'Court Smith is due the credit of the discovery of a thin but very richly fossiliferous band in this series of deposits at Thorness and Gurnet Bays, near Cowes, which has largly increased the interest of these beds, especially by a very important addition to the known terrestrial forms of life belonging to the Eocene period. " The section is as follows :- " General Section at Thorness and Gurnet Bays. Thickness. Surface soil. ft. in. I. Grey Clays with occasional bones of Emys or Trionyx 10 0 II. Lighter (Yellow) Clays with broken shells 2 0 III. Limneea Limestone with Planorbis and bones of Emys, also hard concretions (Hard limestone bed) 3 0 IV. Variegated fossiliferous Clays 8 0 V. Upper Limestone beds with Limneea and small oblong Oyster (Ostrea so.*!) 3 0 VI. Band of loose shells with Ostrece and Sharks' teeth 0 6 VII. Blue Clays with Cyrena 3 0 VIII. Fossil Plant-and Insect-bed 1 0 Base of cliff. 30 6" |