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MR. F. W. O. RYMER JONES ON SOME JAVAN DEEP-SEA LAGENiE. (57 



These double-chambered forms might possibly, at first sight, be regarded as be- 



longing rather to the Nodosarlce than to the Lagenm ; but from a careful examination of 

 the forms which have come under my own observation, I am inclined to consider them 

 true varietal forms of Lagena. 



+ 



Dr. Wallich depicts an elongated and striated two-celled form (North Atlantic Sea- 

 bed, pi. V. fig. 18; and Messrs. Parker and Eupert Jones, Monogr. pi. xviii. fig. 13), 

 which may be regarded as either a two-chambered Lagena or Nodosaria scalaris^ Batsch ; 

 but the development of the upper chamber in the forms delineated in figs. Gl <fe G2, 

 together with the several minor characteristics which they have in common with other 

 LagencBi allies them more intimately with the former than with the Nodosarine series. 



INDEX TO THE PLATE. 



Plate XIX 



Fig. 1. Lagena vulgaris, Williamson, var. [Entosolenia] globosa, Montagu, x 200 diameters. 

 Fig. 2. The same : shell which has apparently been broken and repaired, x 300 diam. 

 Fig. 3. L. vulgaris, Williamson, var. apiculata, Reuss, x 300 diam. 

 FifiT. 4. The same : shell provided at the base with a caudate appendage, x 200 diam. 



« 



form, front view, showing elongated side-chamber, x 300 



Figs. 6, 7. L. vulgaris, Williamson, var. fissurina, Reuss, x 300 diam. 



Fig. 8. The same, provided with an external neck, X 400 diani. 



Fig. 9. L. vulgaris, Williamson, var. gothica, Nov., x 300 diam. 



Fig. 10. L. vulgaris, typica, Williamson, X 200 diam. 



Fig. 11. The same, x 400 diam. 



Fig. 12. The same ; subglobular flask, provided with a minute internal basal tube, X 200 



round the orifice, x 300 diam 





Fio- 



?, Nov., X 200 diam. 



ata, WilUamson, x 140 diam. 



MontaETU. x 400 diam. 



Fig. 17. The same, x 100 diam. 



furnished with a few transverse rings on the neck, x 200 diam 

 •m, the riblets being reduced to about six, x 200 diam. 



Fig. 20. Ditto, ditto, the riblets projecting from the base, x 300 diam. 



Fig. 21. L. vulgaris, Williamson, subvar. striato-areolata, Nov., X 100 diam. 



Fig. 21 a. The same : magnified portion of the base, showing the areolae, x 200 diara. 



Fig. 22. L. vulgaris, Williamson, var. caudata, D'Orbigny, X 100. 



Fig. 23. L. vulgaris, Williamson, var. desmqphora, Nov., x 1 iO. 



Fig. 24. The same, x 200 diam. 



Fig. 25. L. vulgaris, Williamson, var. sulcata, Walker and Jacob, x 300. 



Fig. 26. The same : fragment, showing spiral ornamentation of the neck, x 200 diam 



2 



