34 FORAMINIFERA OF THE CRAG. 



The distribution of the common, smooth, flask-shaped Lagena is world-wide ; they are 

 often found at considerable depths, but shallow water appears to be their favorite 

 habitat. In the fossil state this smooth variety is very abundant in the Post-pliocene 

 clays of Lincolnshire and Cambridgeshire, and in the Grignon beds (Eocene) ; it occurs 

 also in the Vienna Tertiaries, and in the Crag of Antwerp and the Septarium-clay of 

 Pietzpuhl (Reuss) ; in the Tertiary beds of Taranto (Costa), and in the Miocene clay of 

 Messina (Seguenza). 



The Crag specimens in Mr. Wood's Sutton collection are few in number, and small. 



3. Lagena semistriata, Williamson. Plate IV, fig. 6. 



OoLiNA STRiATicoLLis, TfOrh., 1839. For. Amer. Merid., p. 21, pi. 5, fig. H. 

 Lagena striata, var. /3, semistriata, Williamson, 1848. Ann. Mag. Nat. Hist., 2nd 



ser., vol. i, p. 14, pi. 1, figs. 9, 10. 

 OvuLiNA lacryma, 0. TENUIS, Bornemanti, 1855. Zeitsch. Deutsch. Geol. Ges., vol. 



vii, p. 307, pi. 12, figs. 2, 3,3*. 

 OoLiNA PUNCTATA, 0. STEiATULA, Egger, 1857. Foram. Mioc. Nied.-Bay., p. 6, pi. 1, 



figs. 1—8. 

 Lagena vulgaris, var. semistriata, Williamson, 1858. Rec. For. Br., p. 6, pi. l.fig. 9. 



— — var. PERLUciDA, 7c?., 1858. lb., p. 5, pi. 1, figs. 7, 8. 



— — var. semistriata, Reuss, 1862. Sitz. Akad., vol. xlvi, p. 322, 



pi. 2, figs. 18—21. 



— tenuis (parte). Id. lb., p. 325, pi. 3, figs. 34— 39. 



— STRIATA (parte), Id. lb., p. 327, pi. 3, fig. 45. 

 Phialina longissima, Seguenza, 1862. For. Mon. Mioc. Messin., p. 45, pi. 1, fig. 18. 



— semicostata. Id. lb., fig. 19. 



Lagena sulcata, var. semistriata, Parker and Junes, 1862. In Append. Carpenter's 



Introd., p. 309. 



— semistriata, Brady, 1864. Trans. Lin. Soc, vol. xxiv, p. 472. 



— SULCATA, var. semistriata, p. and /., 1865. Phil. Trans., vol. civ, p. 350, 



pi. 13, fig. 23. 



Characters. — Shell flask-shaped, usually having the neck longer in proportion to the 

 body than in the other varieties, having striae and riblets extending from the base of the 

 shell upwards for a short distance on the sides. Colour white ; very transparent. 

 Length j^th to -ih. inch. 



This is not an uncommon subvarietal form where Lagena prevail ; but there is too 

 little that is distinctive in its differentiation from elongated specimens of the typical 

 L. sulcata to lay down any very definite scheme of its distribution. As Professor Wil- 

 liamson remarks, the costse may terminate either in the lower, middle, or upper third of 

 the shell ; and though in the first or even the second case it would be easily recognised, 

 it is obvious that in many individuals with longer ribs other characters, such as the length 



