6 PROCEEDINGS OF THE NATIONAL MUSEUM vot.. 70 



spiiiose processes from the upper angle of each chamber extending 

 straight out from the test, each chamber with the ventral angle hav- 

 ing a raised ridge continuing to the spine at the periphery; aperture 

 elongate, narrow. 



Length up to 0.60 mm. 



Brady's specimens referred to in the above reference were from 

 Challenger station 192 off the Ki Islands. I have had the species from 

 numerous stations in the Pacific where it is common. 



BHRENBERGIN.i TRIGONA Goes 



Plate 2, fig. 3 



Textularia triquetra Goiis (not von Munster), Kougl. Svensk. Vet. Akad. Handl., 



vol. 19, No. 4, 1882, p. 83, pi. 6, figs. 183, 184. 

 Ehrenbergi.na serrata Rbuss. var. trigona GoKS, Bull. Mils. Comp. Zoi)!., vol. 



29, 1896, p. 49. 

 Ehrenhergina trigona Cushman, Bull. 104, U. S. Nat. Mus., pt. 3, 1922, p. 135, 



pi. 26, fig. 4. 



Test roughly triangular in front view, dorsal side slightly curved 

 or plane, ventral side with or without a central furrow, the peripheral 

 angles slightly spinose, the projections pointing downward; sutures 

 distinct, not depressed on the dorsal side, only slightly so on the ven- 

 tral side; the ventral angle of the chambers with a slight raised ridge; 

 aperture elongate, curved. 



Length 0.40 mm. 



Ehrenhergina trigona Goes may be used for those specimens of the 

 Western Atlantic which have a decided trigonal form, the slightly 

 thickened edges to the chambers and the spinose projections pointing 

 downward. It is represented off the coast of Brazil by the follow- 

 ing variety: 



EHRENBERGINA TRIGONA Goes, var. BRAZILIENSIS Cushman 



Plate 2, figs. 4 a, b. 



Ehrenhergina trigona Goes, var. braziliensis Cushman, Bull. 104, U. S. Nat. Mus., 

 pt. 3, 1922, p. 136, pi. 26, figs. 1-3. 



Test differing from the typical in having the test much more com- 

 pressed, the whole being very thin and broad, the angles at the sides 

 well developed and spinose, usually with numerous short spines below 

 the main one at the angle, the early portion of the test often covered 

 with numerous short spinose processes; wall rather coarsely perforate, 

 test translucent. 



The types of this variety (Cat. No. 16395, U.S.N. M.) are from off 

 Brazil in 417 fathoms. The very flat form with peculiar roughened 

 angles are distinctive. 



