64 BULLETIN 71, UNITED STATES NATIONAL MUSEUM. 



Nodosarian, but the chambers usually keep an oblique tendency and 

 the sutures usually oblique, at least in side view. Some species are 

 very much compressed, while others are tumid or strongly umbonate. 

 The surface of the test may be smooth or it may be variously orna- 

 mented with costse, limbate sutures, knobs and bosses, s])ines or com- 

 binations of them and often the peripheral border is broadly keeled. 

 Altogether except for Lagena it presents a greater range of ornamen- 

 tation than any genus of the Lagenidse. The aperture is usually very 

 characteristic, being distinctly radiate and in some species being vis- 

 ible in many of the earlier chambers even when adult size is reached. 



The genus is widely distributed geographically and bathymetric- 

 ally, although it undoubtedly reaches its greatest development in 

 comparatively shallow water — less than 500 fathoms — in rather warm 

 waters, as about tropical islands. It is, however, found in great num- 

 bers in colder waters, but the species are fewer in number and lack 

 the extravagant ornamentation seen in the tropical species. Geolog- 

 ically the range of the genus is a long one, its earliest limits not being 

 satisfactorily determined. 



There are several names of Montfort which were used previously to 

 the use of Crist ellaria by Lamarck, but these are ill defined and the 

 poorly executed figures makes it impossible without a study of the 

 types to say just what species the author had in mind. With such 

 an ill-defined condition it seems ill advised at the present time to 

 replace Cristellaria with any of Montfort 's names. With a study of 

 the types it may be necessary to do this. 



CRISTELLARIA CULTRATA (Montfort). 



Plate 29, fig. 4. 



"Cornu Hammonis" Plancus, Conch. Min., 1760, p. 120, pi. 1, fig. 12. 

 "Nautili (Lenticulae marginatae) " Soldani, Testaceographia, vol. 1, pt. 1, 1789, 



p. 54, pi. 33, fig. B. 

 Robulus cultratus Montfort, [?] Conch. Syst., vol. 1, 1808, p. 214, 54 e genre. 

 Robulina cultrata d'Orbigny, Ann. Sci. Nat., vol. 7, 1826, p. 287, No. 1; Modeles, 



No. 82; Foram. Foss. Bass. Tert. Vienne, 1846, p. 96, pi. 4, figs. 14, 15. 

 Cristellaria cultrata Parker and Jones, Philos. Trans., vol. 155, 1865, p. 344, pis. 



13, 17, 18; pi. 16, fig. 5.— H. B. Brady, Rep. Voy. Challenger, Zoology, vol. 



9, 1884, p. 550, pi. 70, figs. 4, 5, 6.— Egger, Abh. kon. bay. Akad. Wiss. 



Munchen, CI. n, vol. 18, 1893, p. 352, pi. 12, figs. 8-10, 24, 25.— Flint, Rep. 



U. S. Nat. Mus., 1897 (1899), p. 318, pi. 65, fig. 2— Bagg, Proc. V. S. Nat. 



Mus., vol. 34, 1908, p. 147. 



Description. — Test very similar to that of G. rotulata, but with the 

 added character of a peripheral keel of greater or less extent. 



Length up to 4 mm. 



Distribution. — -Brady records this species from a single North 

 Pacific station, off the Philippines in 95 fathoms. Bagg records it 



