On Fossil Echinoderms from the Island of Malta. 101 two on each side, long, narrow, deeply plaited, passing from the umbo forwards, uniting behind the byssus and below the adductor, closing the branchial chamber ; outer gill Imear, composed of a single lamina; inner gill thick, strongly furrowed along the free edge. Palpi small, very narrow, pointed, free. Cypricardia rostrata, Lam. From the Philippines. Mantle-lobes united and covered (except the siphonal area) with a wrinkled straw-coloured epidermis. Siphonal orifices unequal, anal smallest, fringed. Pedal opening (/) rather large. Foot very small, compressed, byssi-^^^__^^^jy ferous. Gills long, narrow, deeply j^^^^^^^^SSX lamellated, very unequal ; outer gill '^J^^^KH^mtim^ rather shorter, and only half as wide (fOL^^^ ^B^M Jmr as the inner, furnished with a narrow ^^^BmmmmK^^y plicated dorsal border ; its lower mar-'^'"'---^'â– â– '-^^ '"â– '" ^''"'" ^^^ gin free posteriorly, adhering to the inner gill in front ; inner gill prolonged between the palpi. Palpi small, triangular, plaited inside. Adductor muscles each of two distinct elements ; anterior joefi?a/ muscle distinct ; posterior combined with adductor. Cypricardia hsolenoides, Reeve. Mantle-lobes united, margins slightly cirrated behind. Pedal orifice rather large. Foot very small, compressed, acute-edged, with a large byssal pore near the heel. Siphons conical, cirrated externally ; orifices cirrated ; anal smallest, with a single row of large cirri ; branchial with an inner series of large cirri, and very numerous fine cirri outside. Palpi moderate, obtuse. Gills two^ on each side, deeply plaited, the ridges grooved ; outer gill shorter and narrower ; inner gill prolonged between the palpi ; gills united posteriorly, their loiver margins entirely free. XII. — On Fossil Echinoderms from the Island of Malta; with Notes on the stratigraphical distribution of the Fossil Organ-isms in the Maltese beds^. By Thomas Wright, M.D. &c.. Professor of the Natural Sciences in the Cheltenham Grammar School. [With four Plates.] A. Notes on the Maltese beds, with the species they contain. The Island of Malta is entirely composed of tertiary rocks of Miocene age, which have been described by Capt. Spratt, R.N.f, * Being the substance of a Lecture delivered to the Members of the Cotteswold Club, held at Tortworth Court, September 14, 1854. t "On the Geology of the Maltese Islands," with Notes on the Fossils by Prof. E. Forbes. Proceed, of the Geol. Soc. London, vol. iv. p. 225.
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