FORAMTNIFERA OF THE ATLANTIC OCEAN. 77 



The change of name from T. rohertsoni to T. hradyi as proposed 

 by Robertson is made necessary by definite rules of nomenclature. 

 In this case the change simply means a reversal of the two names 

 and should be made for conformity. 



Although I have not seen specimens, the figures suggest that 

 this may be JJa'plopliragmoidcs rather than Troclmmmina. 



TROCHAMMINA ROTALIPORMIS J. Wright. 



Plate 16, figs. 1 and 2. 



Trochammina infiata (Montagu), var., Balkwill and Wright, Trans. Roy. Irish 

 Acad., vol. 28 (Science), 1SS5, p. 331, pi. 13, lisrs. 11, 12. 



Trochammina rotali/ormis J. Wright, in Heron-Allen and Earland, Journ. Roy. 

 Mier. Soc, 1911, p. 309. — Herok-Allen and Earland, Proc. Roy. Irish 

 Acad., vol. 31, pt. (54, 1913, p. 52, pi. 3, figs. 11-13; Trans. Zool. Soc. London^ 

 vol. 20, 1915, p. 620, 



Descripiion. — Test small, trochoid, spire somewhat elevated, 

 composed of about three volutions, gradually increasing in diame- 

 ter; chambers distinct, four in each volution, sutures oblique and 

 curved, slightly depressed, ventral side irregular, the last-formed 

 chamber occupying nearly* one-half the area of the test, smoothly 

 finished ; aperture elongate, at the base of the chamber in the umbili- 

 cal region, with a sort of lip-like projection above; color reddish or 

 yellowish brown. 



Diameter, up to 0.45 mm. 



Disirihuiion. — This species is known from various localities about 

 the British Isles, especially off Ireland, but has not been recorded 

 from the western Atlantic. 



TROCHAMMINA GLOBIJLOSA, new species. 



Plate 16, figs. 3 and 4. 



Descri'ption. — Test subglobose, trochoid, spire depressed, consist- 

 ing of about three volutions, chambers rapidly increasing in size, 

 four or five in the last-formed volution, chambers subglobose, 

 sutures deep; wall finely arenaceous, with much cement, smoothly 

 finished; aperture large, umbilicate, formed by the umbilicate 

 region of the last volution and the arch of the last-formed chamber; 

 color dark reddish brown, the last-formed chamber lighter in color. 



Diameter, up to 1.25 mm. 



Disirihuiion. — Type specimen (U.S.N.M. No. 10625) from Alba- 

 tross station D2383 in the Gulf of Mexico. There are several other 

 stations for this species in the Gulf of Mexico and in the Caribbean 

 and several off the northeastern coast of the United States. 



The species is in some respects like T. glolngeriniformis, but diflers 

 in the texture of the wall, the dark red color with dull, shining sur- 

 face, and especially the form of the chambers and the very large 



