THE FAMILY MILIOLID.E 97 



Genus Vertehralina, D'Oebigny. 



Early chambers partly milioline and partly piano- 

 spiral, later segments in a straight series. Eocene to 

 Recent. 



Example. — F. striata^ D'Orbigny, ' Ann. Sci. Nat.' 

 vol. vii. 1826, p. 283, No. 1 ; Modele, No. 81. 



The above species is often fomid in sponge sand 

 from the Mediterranean, and it is frequent in shallow 

 water round coral islands in the tropics.— i?ece7^f. 

 (Plate 3, fig. G.) 



GrENUS Oj)]itJudmidmm, Kublee. 



Spiral and unconstricted at the commencement, 

 subsequently with two or more segments in each 

 whorl. Lias to Beceut. 



Example. — 0. tumidul/iiii, Brady, ' Eep. " Chall." ' 

 vol. ix. 1884, p. 189, pi. xii. fig. 6. 



This species was obtained by H.M.S. ' Challenger ' 

 from the West Indies at a depth of 390 fathoms. 

 An arenaceous isomorph of this form was found by 

 the writer in the Gault clay at Folkestone. — Becenf. 

 (Plate 3, fig. H.) 



Genus Hduerijw, D'Orbigny. 



Commencing with a milioUna-like series, after- 

 wards planospiral, with more than two segments in 

 each whorl. Cretaceous to Beceut. 



Example. — H. ornatis.sivia, Karrer sp. {Quiiiqne- 

 hcnluia ornatissiina), ' Sitzungsb. Ak Wiss. Wien,' 

 vol. Iviii. 1868, p. 151, pi. iii. fig. 2. 



II 



