64 FORAMINIFERA OF THE CRAG. 



Oethoceka, Lamarck, Blainville, Fleming, Thorpe. 



Vaginulina, lyOrbipiy, Roemer, tlhrenberg, MacgiJHvruy, Bronn, Morris, Reuss, 



Parker and Jones, Terquem, Bornemann, Neuegeboren, Cornuel, Karrer, 



Brady, Seguenza, &c. 

 Dentalina (in part), Macgillivray, Williamson. 

 Spiealina, Brown. 



Characters. — Shell elongate, tapering, straight or arcuate, compressed ; composed of 

 several oblique segments, arranged in a linear series ; slightly or not at all constricted at 

 the septal lines. Aperture marginal. 



Vat/inidina proper has a compressed shell, but some specimens have the earlier 

 segments compressed and the later chambers vesicular, thus comprising Dentaline or 

 Marginuline characters, as the case may be. In a Nodosarian shell with oblique chambers, 

 if there be no compression, the shell is a Marf/i/iulina if stout, and a Dentalina if tapering. 

 If commencing with an inclination to be spiral, the shell is a Marc/inulina if stout, but a 

 Planularia if much compressed, in either case pointing towards Cristellaria. 



VaginulincB may have any of the ornaments found in other Nodosarina, but they 

 usually take on, in various degrees, and either alone or combined, first, a limbation of 

 the septal lines and of the margins, and secondly, riblets, continuous or interrupted, and 

 usually oblique to the axis of the shell. 



Vaginulina legumen, Linne, is the type of these elongate, compressed, and oblique- 

 chambered Nodosarinm . The form referred to by Linne is smooth and compact in 

 growth, and has limbate or thickened septal lines ; Vag. elegans, D'Orb., and V. ligata, 

 Rss., are still more limbate ; Batsch figures a much less compact shell, without ornament, 

 as Nautilus leguminiformis ; keeled individuals (limbate on the margins only) are 

 D'Orbigny's Vaginulina marginata and V. caudata ; ribbed, without limbation, V. linearis, 

 Montagu, sp., being either very sparingly ornamented or ribbed all over; partly ribbed 

 and limbate, V. margariti/era, Batsch ; much compressed and ribbed, V. striata, D'Orb. — 

 and so on. 



Genus — Vaginulina legumen, Linne, sp. 



a. Chambers distinct, not compact, unornamented. 



Nautilus (Orthoceeas) leguminiformis, Batsch, 1791. Conch. Seesand., pi. 3, 



tig. 8 a. 

 NoDOSARiA LEGUMEN, Reuss, 1845. Verst. Bulini. Kreid., part 1, p. 28, pi. 13, 



figs. 23, 24. 

 Dentalina communis (parte), Parker and Jones, 18(J0. Uiiart. Jouru. Geol. Soc, 

 vol. .xvi, p. 457, pi. 19, fig. 26. 



