136 BULLETIN 104, UNITED STATES NATIONAL MUSEUM. 



of spines, one or more at each angle; chambers numerous, inflated 

 somewhat on the ventral side; sutures distinct, very slightly if at 

 all depressed on the dorsal side, more distinctly depressed on the 

 ventral side, wall thin, translucent, finely perforate, smooth except 

 for the spines; aperture elongate, curved, often with a slight lip 

 extending in, nearly at right angles from the inner margin of the 

 chamber; color whitish. 



Length up to 0.75 mm. 



Distribution.— Goes records this variety from 300 fathoms (549 

 meters) in the Caribbean as scarce, evidently based on his earlier 

 1882 work. He also records it from the Pacific in 1,201-1,322 

 fathoms (2,197-2,400 meters) as scarce. In the Albatross material 

 I have examined from the Caribbean, Gulf of Mexico, and eastern 

 coast of America specimens of this general form have occurred at 

 three stations, D2117, 683 fathoms (1,249 meters), in the Caribbean; 

 D2614, 18 fathoms (33 meters), south of Cape Hatteras, and D2644, 

 193 fathoms (353 meters), off the coast of Cuba. Specimens were 

 rare in each case. These correspond fairly well with the figures 

 given by Brady, quoted above, but the ventral side usually has a 

 single instead of a double line of spinose angles. 



Ehrenbergina trigona — material examined. 



EHRENBERGINA TRIGONA Goes, var. BRAZILIENSIS, new variety. 



Plate 26, figs. 1-3. 



Description. — Test differing from the typical with a much more 

 compressed form of the test, the whole being very thin and broad, 

 the angles at the sides are 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 pro- 

 jections, wall rather coarsely perforate, test translucent. 



Distribution.— Type-specimen (U.S.N.M. No. 16395) from Alba- 

 tross station D2756, 417 fathoms (763 meters), off the coast of Brazil. 

 At this station the variety is rather common, all the specimens being 

 very constant in their character and of this form. This evidently 

 is a local variety developed in this particular region. 



