Msmi.wi) (;i;(»i,<»(;ic \i, sikni:^ 251 



to llicsc >iii-r;iic r<iiin> jiiid I'mt'cssni- liiadv luis |)i'c|iiirc(l :t list lo show 

 this rciiliirc. Ill this list we liiid seven specii's ol" (ilobif/erinac, Orhulinn 

 uinrersa, Jl itslujmiKi jirhniicii, I'nllniid (ihlif/niloriildlfi, SpJiarroidiiia <le- 

 hiscenft, CnnrJeiiui niliiln, six species (if riilriniilliifi, Cijinhnloporn hiil- 



](in/('s- ;ili(| ( 'll llnslmiiclhl iiraiilcd IkCllSS. 



Oci-iirrnin'. — NA^■.IKlM()^■ I"<ii;\i vi'iox. W'nodstoek. Well ;it C'lu'sa- 

 peake IJeaeh at 90-92 foot. 



Collections. — Joliiis Hopkins University, ^laryland (ieohigieal Survey. 



Family ROTALIDAE. 



Genus DISCOKRINA Wwkcr and |(.nes. 



DiSCOKBIXA BERTUE1,()TI (d'Orljipny). 



Plate LXIV, Fig. 1. 



lio.suliiia btrthch'ti d'Orbiguy, 183W, Foranj. Canaries, j). 135, pi. i, ligs. ;i8-30. 

 Biscorhina bertheloti Bagg, 1896, Bull. 141, U. S. Geol. Survey, p. 92. 

 DiHcorbina bertheloti Bagg, 1898, Bull. Amer. Pal., No. 10, p. 34. 



Description. — Test very compressed, carinate, finely jjiinctate; spiral 

 side approximately flat, reverse side low-convex: chambers depressed, nu- 

 merous, convex, margins slightly limhate: iiltimato chamber larger than 

 the one preceding. The shell is quite similar to TruncatuUna lohatula, 

 but it is more depressed, and the walls are more finely perforate; diame- 

 ter, 0.43 mm. 



This is a shallow-water foi-aminifera occurring usually at depths of 

 less than 500 fathoms. 



Occurrence. — Nanjemoy Formatiox. "Woodstock. 



Collection. — Johns Hopkins University. 



DiscoRBiXA TFKBO (d'Orbiguy). 

 Plate LXIY, Fig. 2. 



Rotalia (TrochnliHa) turbo d'Orbiguy, 1826, Ann. Sci. Nat., vol. vii, p. 274, No. 29; 



Modele, No. 73. 

 DiscorUna turbo Parker, Jones and Brady, 1S6.5, Ann. and Mag. Nat. Hist., series 3, 



vol. xvi, p. 30, pi. ii, tig. 68. 

 BUcorbina turbo Brady, 1884, Chal. Kept., vol. ix, p. 642, pi. Ixxxvii. figs. 8, rt, b, >:. 



Description. — Test solidly built in a compact involute subcorneal form; 

 walls rather coarsely perforated: six chambers visible on inferior surface 



