May 1, 1870.] 



HARDWICKE'S SCIENCE-GOS SIP. 



107 



mia, the gault of Kent, the greensand at War- 

 minster, Earringdon, Mans, and Bohemia, the Hilse 

 clay of Germany, and in Yorkshire. It has been 

 honoured with many names, some of which are in- 

 cluded in Morris's Catalogue, and has been often 

 iigured*. 



Fig. 108. Cristellaria navicula. 



25.'' Cristellaria navicula (fig. 108) is said to be 

 rare at Sens and Meudon, but is recorded in the 

 Kentish chalk. 



Fig. 109. Cristellaria triangularis. 



26. Cristellaria triangularis (fig. 109), although 

 stated to be very rare at Sens, does not appear to 

 be at all an uncommon form. It lias been found at 

 Charing, in the gault at Folkestone, and in the 

 chalk of Kent and Bohemia. 



Fig. 110. 



Cristellaria recta. 



Fig. 111. 

 Cristella ria Ga udryana . 



27. Cristellaria recta (fig. 110) is another rare 

 species at Meudon and St. Germain, but Morris 

 records it from Charing. 



28. Cristellaria Gaiulri/ana (fig. Ill) is the last 

 of D'Orbigny's forms of Cristellaria, said to be 

 obtained solely from St. Germain, and is the only 

 one not included in the British list; 



29. Lituola nautiloidea (fig. 112). — This single 

 form of Lituola is very common at Sens, and more 

 rare in other parts of Erance. It is a common Euro- 

 pean species, and occurs at Charing, and in the chalk 

 of England. 



The other family of the order Helicostegia contains 

 ten genera, and some very widely distributed forms. 



Fig. 112. Lituola nautiloidea. 



30. Rotalina Voltziana (fig. 113) is very common 



%g^ 



Fig. 113. Rotalina Voltziana. 



at Meudon, St. Germain, and in English chalk, as 

 well as at Charing. 



Fig. 114. Rotalina Mieheliniana. 



31. Rotalina Micheliniana (fig. 114) is common at 

 Meudon, St. Germain, and England, but rare at 

 Sens. Also found in other parts of Europe, and is 

 figured by Reuss from Bohemia. 



Fig. 115. Rotalina uml Meat a. 



32. Rotalina nmbilicata (fig. 115), recorded as 

 common at Meudon and St. Germain, is found at 



