TRIGONIA. 81 
Types.—I have not found the type. The specimens figured by Lycett are in the 
Museum of Practical Geology (figs. 1—3), and in Mr. Vicary’s collection (fig. 4). 
Distribution —Blackdown Greensand (Zone x). 
Section 5.—Scapra. 
Triconta Erxeripcet, Lycett, 1875. 
1875, Lycett, p. 127, pl. xxvii, figs. 1—3. 
Types.—In the Museum of Practical Geology. 
Distribution.—Perna-bed of Atherfield. 
TRIGONIA CAUDATA, Agassiz, 1840. 
Additional Synonymy. 
¢1852. Triconia auirormis, I. J. Pictet and W. Roux. Moll. Foss. Grés verts de 
Geneve, pl. xxxv, fig. 1 (not fig. 2), p. 450. 
1866. _— caupara, Ff. J. Pictet and G. Campiche. Foss. Terr. Crét. Ste. 
Croix (Mat¢r. Pal. Suisse, ser. 4), p. 374. 
1869. — — P. de Loriol and V. Gilliéron. Mon. Urgonien Infér. 
du Landeron (Mém. Soc. helvét. Sci. nat., 
vol. xxii), p. 15. 
1875. _ — Lycett, p. 129, pl. xxvi, figs. 5—7, 
1895. — — G. Maas. Geitschr., der deutsch. geol. Gesellsch., vol. 
xlvil, p. 264. 
1900. — _ A, Wollemann. Die Biv. u. Gastrop. d. deutsch. u. 
hollind. Neoc. (Abhandl. d. k. preussisch. geol. 
Land., N. F., pt. 31), p. 89. 
Types—From the Neocomian of Neuchatel. The specimens figured by Lycett 
are in the Museum of Practical Geology. 
Distribution.—Crackers of Atherfield. Recorded by Topley (1875) from several 
localities in the Weald—lI have not seen the specimens ; 1t is probable that some of 
them are examples of 7, vectiana. 
11 
