Notices respecting New Books. 373 



rugatd; dente cnrdinali prominente ; umbonibus postice angulatis ; 

 margine dorsali posteriori subcarinatd. 

 Hab. Ohio. T. G. Lea. My cabinet. 



4. Unio Ellipsis.— Testa Jiguram ellipseos habente, longitudinali, 

 ventricosd; valvulis crassis, umbonibus fere terminalibus ; dentibus gran- 

 dibus et distinctis. 



Hab. Ohio. T.G.Lea. My cabinet. Cabinet of T. G. Lea. Cabi- 

 net of Prof. Vanuxem. Cabinet of Mr. Nicklin. Peak's Museum. 

 Cabinet of the Academy of Natural Sciences. 



Var. a — red inside, rare. 



Cabinet of the Academy of Natural Sciences. My cabinet. 



5. Unio irrouatus. — Testa incequilaterali, sub-orbiculatd, longi- 

 tudinali, tuberculoid, rugosd, longitudinaliter uni-sulcatd ; dente laterali 

 abrupte terminante. 



Hab. Ohio. T. Bakewell. My cabinet. Cabinet of T. G. Lea. Ca- 

 binet of Prof. Vanuxem. Cabinet of the Academy of Natural Sciences. 

 Mr. Nicklin 's cabinet. 



6. Unio lacrymosus. — Testa sub-quadrangulari, incequilaterali, 

 postice angulatd, transversd, tuberculata ; dente laterali abrupte termi- 

 nante. 



Hab. Ohio. T.G.Lea. My cabinet. Cabinet of T. G. Lea. Cabinet 

 of Prof. Vanuxem. 



Philosophical Transactions for 1828, Parts I. and II. 



The following are the contents of these parts of the Philosophical 

 Transactions : — Part I. — Experiments to ascertain the ratio of the 

 magnetic forces acting on a needle suspended horizontally, in Paris 

 and in London. By Captain E. Sabine. — On the resistance of fluids 

 to bodies passing through them. By J. Walker, Esq. — On the cor- 

 rections in the elements of Delambre's Solar Tables required by the 

 observations made at the Royal Observatory, Greenwich. By G. B. 

 Airy, Esq. — Experiments to determine the difference in the length of 

 the seconds pendulum in London and in Paris. By Captain E. Sabine. 

 — On the measurement of high temperatures. By J. Prinsep, Esq. — 

 On Captain Parry and Lieutenant Foster's experiments on the ve- 

 locity of sound. By Dr. G. Moll. — An account of a series of experi- 

 ments made with a view to the construction of an achromatic tele- 

 scope with a fluid concave lens, instead of the usual lens of flint glass. 

 By P. Barlow, Esq. — A catalogue of nebulae and clusters of stars in 

 the southern hemisphere, observed at Paramatta in New South 

 Wales, by J. Dunlop, Esq. — An account of trigonometrical operations 

 in the years 1821, 1822, and 1823, for determining the difference of 

 longitude between the Royal Observatories of Paris and Greenwich. 

 By Capt. H. Kater. — On the phaenomena of volcanoes. By Sir H. 

 Davy, Bart. — Abstract of a meteorological journal kept at Benares 

 during the years 1824, 1825, and 1826. By J. Prinsep, Esq. — Ap- 

 pendix. — Meteorological Journal for 1827, kept at the Apartments of 

 the Royal Society, by order of the President and Council. 



Part II. — A description of a vertical floating collimator ; and an 

 account of its application to astronomical observations, with a circle 



and 



