THE NAUTILUS. < 



to the palliata than the appressa. The species may be diagnosed as 

 follows : 



Pohjgyra (Triodopsis) suhpalliata n. sp. Shell depressed, thin, 

 pale green or bufT-green, somewhat translucent. Surface shining, 

 minutely roughened by narrow granules elongated in the direction 

 of growth-lines. Spire convex, composed of slightly over 5 convex 

 whorls, the last rounded at the periphery, deflexed in front, and 

 very deeply constricted behind the lip. Aperture oblique ; outer 

 lip flatly reflexed, white, wide, the arcuate basal lip bearing a long 

 plate-like callus, as in H. palliata; parietal wall bearing a large, 

 high, curved tooth, like that of H. palliata. Alt. 9?, diam. 15 mill, 

 (largest specimen). Alt. 7, diam. 13 mill, (smallest specimen). 



BALL'S TERTIARY MOLLUSKS OF FLORIDA. i 



This second volume of Dr. W. H. Ball's great work upon the 

 Tertiary Mollusks of Florida is much wider in scope than the pre- 

 vious part, including much matter upon other East American 

 faunas of the same epoch, notably the Pliocene of the Caroliuas. 

 The introductory chapter graphically describes the series of changes 

 of shore line and elevation of our southeast coast, from the close of 

 the Eocene to the present time ; and this has been noticed and 

 quoted from in a previous number of the Nautilus. 



The systematic enumeration and description of species occupies 

 the greater portion of the work, the subject being completed down 

 to the Pelecypods, which will form the third part of the work. 



The new genera and subgenera proposed are as follows : Ghjpto- 

 styla (type G.panamensis Dall), a peculiar form like Pijrula outside 

 but ponderous and with the plaits of Latirus. Trachyodon, new 

 subgenus of Chiton for C. eocenen-sis Conr. 



The generic synonymy of Vivipara is worked out in full, the 

 author concluding that Vivipara (Martini) Lamarck, has priority 

 over the very bad masculine form, Viviparus Montf., which has 

 lately been adopted by English authorities. Incidentally the his- 

 tory of the name Bulimus is discussed, and shown to be totally 

 inapplicable to the genus of laud snails generally known by that 

 name. Clava, of Martyn, is used as a generic name to supercede 



^Transactions of the Wagner Free Institute of Science of Philadelphia, vol. 

 3, pt. ii. Issued January, 1893. 



