262 REPORT OF NATIONAL MUSEUM, 1897. 



Test dimorphous, etc.— Continued. 



Early chambers jiiilioline, subsequently i)lanospiral with more tlian two seg- 

 ments in each convolution Genus llaiterina. 



Chambers oquitant, arranged as in Hauerina, the last convolution covering the 



previous whorls Genus PUtmspirina. 



Test ])lauospiral or cyclical, sometimes cro/.ier-sliapcd, bilaterally symmetrical : 



Subfamily Pkxeroi'I.tdin.k. 



Chamber one, au undivided planospiral tul)c Genus Coiniifipira. 



Chambers numerous, undivided, planospiral or spiral at first and rectilinear or 



cyclical afterwards Genus Peueyoi>lis. 



Chambers subdivided transversely; early segments embracing; arrangement 



wholly i)lauospiral or partly cyclical Genus Orhimlhia. 



Chambers subdivided into chamberlets ; test discoidal Genus OrhHoliU-s, 



Test spiral, elougatcnl in the line of the axis of convolution . . Subfamily Alyeolinin.k. 



Snbglobular, elliptical, or fusiform Genus Alreolina. 



Test spherical ; chambers in concentric layers Subfamily Kkramosimi.krin.e, 



{.'hambors very numerous, irregularly shaped Genus Keramosphara. 



Farfuily VI. Laoenid.k. 



Test monothalamous Subfamily Lagenid.e. 



A single undivided chamber Genus Laijena. 



Test poly thalamous, straight, arcuate or planospiral Subfamily Nodosauin.e. 



Monomor])hous. 



Straight or curved, circular in transverse section ; aperture central : 



Genus Nodosaria. 

 Straight, compressed; aperture typically a narrow fissure. -Genus Lhujulina. 

 Compressed or complanate; segments V-shaped, ecjuitant: 



Genus Frovdicularia. 

 Straiglil. or slightly curved, triangular or (|uadrangular in section: 



Genus llhuMogon'uim. 

 Elongate, curved, circular in section ; aperture marginal : 



•Genus Marf/inulhia. 

 Elongate, compressed or complanate; septation oblique; aperture marginal: 



Geaus VafiinuJ'ma. 

 Vaginuline; septation very oblique; aperture a long slit down the ventral 



face of the final segment Genus JUmiilhia. 



Planospiral in part or entirely; complanate, lenticular, crozier-shaped or 



ensiform Genus CrisfcUaria. 



Dimorphous. 



Early segments Crisiellarian, later ones Nodosarian Genus Jmphyconjne. 



Early chambers Crisiellarian, later ones Linguline Genus Liiigidniopsis. 



Early chaml)ers Crisiellarian, later ones Froudicularian Genus FlabelUna. 



Early chambers Frondicularian, later ones Nodosarian : 



Genus A tupliim orph i na . 



Early chambers j;hnhd(Xionian,\ntev ones Nodosarian Genus DoituUuopsis. 



Test pfdythaiamons; segments arranged spirally around the long axis; rarely 



biserlal and alternate Subfamily Polymoui'HININ.k. 



MonoiiKuphous. 



Segments bi- or tri-serial or irregularly spiral; aperture radiate: 



Genus rohiiiiorphiiia. 

 Segments arranged spirally around the long axis of the shell (rarely bise- 

 rial); aperture simple, usually surrounded by a phialine lip: 



(Jen us Urigerina. 

 Dimorphous. 



Early segments Polymer pliinc, later ones Nodosarian Genus Dimorpliina. 



Early segments Urigcrine, later ones Nodosarian Genus Sagrina. 



