ALVEOLINA. 



137 



Occurrence. — Orbitolites complanatus is at home in the shallow waters of 

 tropical and subtropical seas, particularly among the coral reefs of the North and 

 South Pacific and the Indian Ocean. Fossil specimens of this species are 

 particularly abundant and very finely developed in the Calcaire Grossier of the 

 Paris Basin. Specimens are also recorded from the Eocene of Belgium and the 

 Bracklesham Beds ; and from the Miocene of Malta (Brady), and of Muddy Creek, 

 Victoria. The Crag examples were obtained from Sutton, and probably were 

 derived from some older Tertiary beds. 



Snb-fainihj 4. — ALVEOLiNiNiE. 

 Spiral, elongate in the axis of convolution ; chambers subdivided. 



Genus 1. — Alveolina, d'Orhigny, 1826. 



Brady, Report ' Challenger,^ 1884, j9p. 62 and 221. 



General Cha.racters. — Subglobular, elliptic, or fusiform. Recent forms often 

 with subdivided chamberlets. 



1. Alveolina, sp. Woodcut, fig. 10. 



Part I, 1866, page 24; and Appendix IT, Table, No. 22. 



Fig. 16. — Alveolina Boscii (Defrance) x 7J. After Brady, Report ' Challenger,' pi. xvii, fig. 9. 



One or two lost specimens, which had been collected at Sudbourne by Mr. 

 S. V. Wood, but much worn and indeterminate, were mentioned at page 24. 

 They were probably derivatives from some older Tertiary formation. 



Occurrence. — Alveolina Boscii is a shallow-water form, and is confined to warm 

 latitudes. It is of common occurrence among coral reefs at depths of twenty or 

 thirty fathoms. This species is a very common fossil in the Eocene of the Paris 

 Basin, and in the Bracklesham Beds of Sussex. The Crag specimens were, in all 

 probability, derived from an older formation. 



