LAGENA GRACILIS. 189 



ribs (twelve to fourteen), and their radiate aperture. They evidently stand with 

 L. acuticostn as above described. 



Occurrence. — Lagena acuticostit, was found by the 'Challenger' at four 

 stations : in the North Pacific, at a depth of 2300 fathoms ; in the Equatorial 

 Pacific, depth 2425 fathoms ; in the South Pacific, deptL 2350 fathoms ; and in 

 the Southern Ocean off Heard Island at a depth of 75 fathoms. It is interesting 

 to notice that the bottom temperature at each of the three Pacific stations was 1° 

 Centigrade. 



Its geological history extends to the Cretaceous period. It has been recorded 

 from the Neocomiau (Bargate Beds) of Surrey ; from the Gault of Folkestone ; from 

 the Upper Chalk of Maestricht ; and from the Oligocene of Pietzpuhl. We have 

 specimens also from the Casterlian and Scaldisian of Antwerp. In the Coralline 

 Crag it is the commonest of the Lagense, and the specimens are generally large 

 and well otowu. 



9. Lagena gracilis, WiUiawsnn, 1848. Plate VII, figs. 6 a, b. 



Laoena gracilis, WiUiamson, 18iS. A. M. N. Hi8t.,ser. 2, vol. i, p. 13, pi. i,fig. 5. 



— TULOAHTS, var. GRACILIS, Williamson, 1858. Eec. roram. Great Brit., 



p. 7, pi. i, figs. 12, 13. 



— GRACILIS, Reuss, 1S63. Sitz. k. Akad. Wiss. Wien, vol. xlvi, part 1, 



p. 331, pi. iv, figs. 58—61 ; pi. v, fig. 62. 



— — Schwager, 1866. Nov.-Exp. Geol., vol. ii, p. 206, pi. iv, figs. 21a, b. 



— Nos. 40—43, Schlicht, 1870. Pietzpuhl, p. 8, pi. ii, figs. 19, 20, 24, 25. 



— VULGARIS, var. CATJDATA, O. Joiies, 1872. Tr. Linn. See, vol. xxx, p. 54, 



pi. xix, fig. 22. 



— GRACILIS, .SViWrt/Z, 1879. Catal. Brit. Rec. For., p. 5. 



— — Biltschli, 1880. In Bronn'a Klassen, &c., p. 197, pi. vii, fig. 6. 



— — Brady, 1884. Report ' Challenger,' pp. 445 and 464, pi. Iviii, 



figs. 2, 3, 7, 10, 19, 22—24. 



— — Chapman, 1893. J. Ii. Microsc. See, p. 563, pi. viii, fig. 13. 



— — Egger, 1893. Abhandl. k. Bayer. Akad., vol. xviii, part 2, 



pp. 321, 328, pi. X, figs. 25, 33, 49. 



— — GoSs, 1894. K. Sven. Vet.-Akad. Handl., vol. xxv. No. 9, 



p. 77, pi. xiii, fig. 738. 



Characters. — Long, flask-shaped, phialine, or fusiform ; with long or short 

 neck, tapering or apiculate below; bearing longitudinal costulse, fine or coarse. 

 Figs. 6rt and 6?) show an individual hexagonal in section, with six rather thick 

 riblets. 



Occurrence. — Lcu/ena gracilis has a wide geographical distribution. It is not 

 uncommon in shallow waters on the western shores of Europe, but the 



