LAGENIDA. 35 



of neck and general contour of the shell, would have to be chiefly considered; and these, 

 as we well know, are extremely variable. D'Orbigny's figure of L. striatocoUis represents 

 a poorly defined specimen of this subtype. 



It is very common to meet with Lagena, both recent and fossil, taking on striae and 

 riblets to greater or less extent, as in this instance. Reuss figures finely striated spe- 

 cimens from the Crag of Antwerp in his paper on the LagenidcB, ' Sitzungsb. Wien. 

 Akad.,' vol. xlvi, pi. 2, figs. 18 — 21. Dr. Wallich, in his memoir on the North-Atlantic 

 sea-bed, figures Z. semistriata (pi. 5, fig. 17) ; and D'Orbigny's Oolina striaticollis 

 (Falkland Isles) belongs to the same variety. It is a common form on our British coast. 

 Egger's Oolina striatula offers an interesting passage-form (especially his fig. 6) between 

 L. semistriata and L. crenafa, P. and J. 



Only a single broken specimen has occurred to us in our examination of the Crag 

 deposits, and this is from Sutton. 



4. Lagena striata, If Orhigny (not of Montagu and Williamson). Plate I, figs. 

 38—40. 



Oolina stri.*.ta, B'Orb., 1839. Foram. Amer. M^rid., p. 21, pi. 5, fig. 12. 



— Haidingeki, Czjzeh, 1847. Haiding. Nat. Abhandl., vol. ii, p. 138, pi. 12, 



figs. 1, 2. 

 Lagena substriata, Williamson, 18-18. Ann. N. H., 2nd ser., vol. i, p. 15, pi. 2, fig. 12. 

 OvuLiNA sicULA, Ehrenb., 1854. Mikrogeologie, part 2, p. 23, pi. 26, fig. 1. 

 Lagena volgaris, var. gracilis. Will., 1858. Rec. For. Brit., p. 7, pi. 1, figs. 12, 13. 



— — var. substriata, Id. lb., p. 7, pi. li fig- 14. 



— gracilicosta, Reuss, 1858. Zeitsch. Dent. Geol. Ges., vol. x, p. 434 ; 1862, 



Sitz. Akad. Wieu., vol. xlvi, p. 327, pi. 3, figs. 42, 43. 



— striata (parte). Id., 1862. Sitz. Akad., vol. xlvi, p. 327, pi. 3, fig. 44 ; 



pi. 4, figs. 46, 47. 

 OvuLiNA STRIATA, Seguetiza, 1862. Foram. Monot. Messina, p. 40, pi. 1, figs. 6, 7. 

 Phialina Haidingeri, Id. lb., p. 46, pi. 1, fig. 20. 



— TENUisTRiATA, Ph. Gemellarii, Ph.cylindeacea, Id. lb., figs. 21, 23, 24. 

 Lagena — Stache, 1865. Novara-Exped., Geol. Theil., vol. i, part 2, 



p. 184,, pi. 22, fig. 4 (like our fig. 40, PI. I). 



Characters. — Flask-shaped Lagena of variable dimensions, ornamented with delicate 

 longitudinal and sometimes spiral striae and riblets, come under the denomination of 

 L. striata. (See the scheme of Lagena, 'Phil. Trans.,' 1865, vol. civ, p. 384.) Out of 

 this, however, as also out of the other groups, we separate the caudate or apiculate forms, 

 leading towards the double-mouthed or distomatous, perforate, cyhndrical Lagena, with 

 which they make another artificial division. 



L. striata accompanies the more common and strongly grown Lagena all over the 

 world, and have existed with them in Tertiary times. We have a few specimens from the 

 Crag of Sutton and of Sudbourne. 



