78 BULLETIN" 10 4, UNITED STATES NATIONAL MUSEUM 



development in the family with a proloculum, long coiled Cornuspira- 

 like chamber, with progressively shorter chambers, the chambers 

 spreading and finally becoming annular but with the division into 

 chamberlets incomplete. The resemblance to the Orhitolites group is 

 purely due to parallelism as the development of the two groups is 

 entirely different. Discospirinia is a rare form known from fairly 

 deep water and apparently also from late Tertiary deposits. In 

 Vertehralina, there is a tendency to adopt a rectilinear development 

 in the later stages. This is known since the Eocene. 



There are also attached forms included in this family which have 

 become degenerate, losing much of their structure. In Nuheculariay 

 which developed early in the Jurassic the chambers are distinct, in a 

 single plane, and the test attached. Such forms persist in modified 

 shape to the present ocean. In Calcituha and Silvestria, the chambers 

 become very irregular and in Squamulina a single-chambered test is 

 developed of very simple degenerate form. 



The Ophthalmidiidae have a calcareous imperforate test in common 

 with the Miliolidae and both are derived from a Glomospira-Y\ke) 

 ancestry. The Miliolidae have developed the coiling in constantly 

 changing planes and upon it built many structural modifications 

 whereas the Ophthalmidiidae adopted almost at once a planispiral 

 form of test which is variously modified. The development of aper- 

 tural teeth and the incorporation of sand grains in the exterior of the 

 test in the simpler form of the Miliolidae are characters not seen in 

 the Ophthalmidiidae. 



Subfamily 1. CoRNUSPiRiNAE 



Test made up of a proloculum and an elongate, planispiral, 

 tubular second chamber. 



Genus CORNUSPIRA Schultze, 1854 



Cornuspira Schultze (Genotype, by designation, Cornuspira planorhis 



Schultze), Organismus Polythal., 1854, p. 40. — H. B. Brady, Rep. Voy. 



Challenger, Zoology, vol. 9, 1884, p. 198. — Chapman, The Foraminifera,. 



1902, p. 99. — CusHMAN, Special Publ. No. 1, Cushman Lab. Foram. 



Res., 1928, p. 160. 

 Orhis (part) Philippi, Eniim. Moll. Siciliae, vol. 2, 1844, p. 147. 

 Operculina (part) Czjzek, in Haidinger's Nat. Abhandl., vol. 2, 1848, p. 



146. 

 Spirillina (part) Williamson, Rec. Foram. Great Britain, 1858, p. 91. 



Test consisting of a proloculum followed by a long planispirally 

 coiled second chamber, rounded or complanate; wall calcareous, 

 imperforate; aperture formed by the open end of the chamber, 

 sometimes constricted and with a thickened lip. 



Carboniferous (?) Jurassic to Recent. 



