0:2 FORAMINIFERA OF THE CRAG. 



Dentalina legumen, Reuss, 1860. Sitz. Akad. Wien., vol. si, p. 43, pi. 9, fig. 5. 



— COLUGATA, Reuss, 1861. Sitzungs. Ak. Wien., vol. xliv, 1 Abth., p. 33-J, 



pi. 7, fig. 4. 



— NANA, Reuss, 1862. lb., vol. xlvi, p. 39, pi. 2, figs. 10, 18. 



— siLiQUA, Id. lb., p. 40, pi. 2, fig. 11. 



— DEFLEXA, !d. lb., p. 43, pi. 2, fig. 19. 



— BoEXTCHEiii, Reuss, 1863. lb., vol. xlvlii, 1 Abtheil., p. 4-4, pi. 2, fig. 17. 



— INORNATA, Id. lb., p. 45, pi. 2, fig. 18. 



— ABNORMIS, D. OBLiatJATA, Id. lb., p. 46, pi. 2, figs. 24, 25. 



— MARGINATA, D. OBLiauEsuTURATA, Stuche, 1865. Novara-Exped., Geol. 



Theil, vol. i, part 2, p. 207, pi. 22, figs. 35, 36. 

 Mauginulina DURACiNA, Id. lb., p. 21 1, pi. 22, fig. 42. 



Characters. — Shell elongated, tapering, more or less curved ; consisting of numerous 

 segments, generally somewhat ventricose. Primordial segment sometimes larger than 

 the second, and either rounded or pointed at its free extremity. The terminal pseudo- 

 podial aperture more or less excentric, sometimes pouting on a prolonged neck, but 

 more commonly a simple orifice, surrounded by radiating grooves. Septal lines often 

 more or less oblique, and generally constricted. Length ^th to ^th inch. 



Although it may be thought that the list of synonyms ^nq have quoted has been 

 carried to an excessive length, vre may be allow^ed to state that it is by no means an 

 exhaustive catalogue. We have carefully avoided doubtful figures ; and in our references 

 to the papers of foreign authors, whenever there has seemed to be anything like a 

 sufficiently distinct character on which to found a sub-variety, we have omitted the 

 name from our table. It is only this desire to be on the safe side in massing previously 

 described "species," that has prompted us to admit such sub-varietal forms as D. 

 pauper ata and B. brevis to separate mention. 



Dentalina communis is an extremely common variety wherever Nodosarian forms 

 occur in the clays of the Secondary formations, but usually it is of small size. It is 

 larger in the Gault than in the Jurassic clays ; still larger in the Chalk-marl and Chalk ; 

 and in the Maestricht Chalk it is large, as well as in the Tertiary beds that yield Nodosarince, 

 being very finely developed in the Sub-Apennine clays. Older than the Secondary 

 deposits, however, it is found in the Permian hmcstones of England and Germany. 



The Crag specimens in Mr. Searles Wood's collection from Sutton are numerous, 

 exceedingly large, and correspond to B. pauperata and such like modifications of 

 group a. 



The Bridlington Crag has supplied a specimen corresponding to D'Orbigny's 

 D. brevis, of the same group a. 



J), communis is a common recent species ; indeed, its geographical range is as extra- 

 ordinary as the extent of its geological distribution. It is found in every latitude from 



