62 BULLETIN 71, UNITED STATES NATIONAL MUSEUM. 



It is a question whether Brady was correct in assigning the recent 

 form which occurred only off Torres Strait to the cretaceous species 

 described by Reuss. In the absence of material this point can 

 simply be suggested as open to question. 



Genus GAUDRYINA d'Orbigny, 1839. 



Gaudryina d'Orbigny (type, G. rugosa d'Orbigny), in De la Sagra, Hint. Fis. 



Pol. Nat. Cuba, 1839, " Foraminif eres, " p. 109; Mem. Soc. Geol. France, ser. 



1, vol. 4, 1840, p. 43; For. Foss. Vienne, 1846, p. 197.— H. B. Brady, Rep. 



Voy. Challenger, Zoology, vol. 9, 1884, p. 377. 

 Heterostomella Reuss, Sitz. Akad. Wiss. Wien, vol. 52, pt. 1, 1865, p. 448. 



Description. — Test free, composed of two distinct portions, the 

 earlier consisting of a series of chambers arranged triserially, followed 

 by a later consisting of a series arranged biseriallyj wall arenaceous, 

 varying much in coarseness in the different species; aperture variable 

 as in the various species of Textularia, either an opening at the base 

 of the inner margin of the chamber, between it and the wall of the 

 preceding chamber, or a perforation near the base of the inner margin, 

 often with a raised border, or in some species a terminal more or 

 less circular opening. 



This species, while related to Textularia, is by its development 

 a genus derived through triserial forms, such as Verneuilina, and its 

 resemblance to Textularia is due to a reversion in its later develop- 

 ment to the biserial condition. There has been some attempt on 

 the part of certain authors to split the genus on the basis of the 

 apertural characters. While this seems reasonable, it is not followed 

 out here, as already mentioned in connection with Textularia. 



This genus has a considerable geological range, but after a study 

 of certain forms it has not seemed wise to unite the recent species 

 with the cretaceous ones described by d'Orbigny. The differences 

 are great enough to be of good specific value, and a discussion of the 

 characters involved will be found under the various species. Most of 

 the recent species are rather constant in their characters, the varia- 

 tions being limited to unimportant details. 



GAUDRYINA SCABRA H. B. Brady. 



Gaudryina pupoides H. B. Brady (not G. pupoides d'Orbigny 1840), Ann. Mag. 

 Nat. Hist., ser. 4, vol. 6, 1870, p. 300, pi. 8, fig. 5. 



Gaudryina scabraH. B. Brady, Rep. Voy. Challenger, Zoology, vol. 9, 1884, p. 381, 

 pi. 46, fig. 7.— Goes, Bull. Mus. Comp. Zool., vol. 29, L896, p. 40.— Flint, 

 Ann. Rep. U. S. Nat. Mus., 1897 (1899), p. 2S8, pi. 34, fig. 1. 



Description. — Test elongate, gradually tapering to the initial end, 

 which is broadly rounded ; cross section rounded ; early triserial por- 

 tion composed of but few chambers, the later biserial portion forming 

 the greater part of the test, chambers rotund; sutures distinct; wall 



