no. 2360. FORAMINIFERA FROM JAMAICA— CUSH3I AN. 59 



Genus DISCORBIS Lamarck, 1804. 



DISCORBIS AUBERn (d'Orbigny). 



Plate 14, figs. 1-3. 

 Rosalina auberii d'Orbigny, Foram. Cuba, 1839, p. 94, pi. 4, figs. 508. 



Description. — Test trochoid, with a low spire, periphery carinate, 

 acute, ventral side slightly if at all convex, composed of several coils 

 with four chambers in each, sutures distinct, wall of the chambers 

 rather coarsely perforate, aperture at the base of the last-formed 

 chamber, elongate. Diameter, 0.4 mm. 



The only specimens were from Runaway Bay. 



This species has not been referred to since its first description, but 

 it fits admirably the material above mentioned. D'Orbigny's speci- 

 mens were from Cuba and Martinique. 



DISCORBIS VALVULATA (d'Orbigny). 



Plate 14, figs. 4, 5. 



Rosalina valvulata d'Orbigny, Ann. Sci. Nat., vol. 7, 1826, p. 271, No. 4; in 

 Barker, Webb, and Berthelot, Hist. Nat. lies Canaries, 1339, vol. 2, pt. 2, 

 "Foraminiferes," p. 136, pi. 2, figs. 19-21; Foram. Cuba, 1839, p. 96, pi. 3, 

 figs. 21-23. 



Description. — Test much compressed, translucent, very thin- 

 walled, dors ally with a very low slightly convex spire, ventrally 

 slightly concave; chambers with the periphery rounded and slightly 

 thickened, sutures distinct but only very slightly depressed, on the 

 ventral side with slight alar projections toward the umbilicus; wall 

 thin except at the chamber margins; punctations very fine; aper- 

 ture at the inner margin of the ventral side of the chamber; color 

 slightly yellowish. Length, about 0.5 mm. 



The only material which belongs to this species is from 6 fathoms 

 (11 meters) at Montego Bay. It is, however, very typical and shows 

 that the figures of d'Orbigny were very accurate for this species. 

 It is evident also that the figures of the Canaries Monograph are 

 much poorer copies of the same figures as in other cases. The original 

 specimens mentioned by d'Orbigny in 1826 were from the coast of 

 Martinique in the West Indies. It is also clear that Brady referred 

 to this species material which is very different and does not belong 

 here. The figures of the Challenger Report (pi. 87, figs. 5-7) show a 

 much thicker, heavier test, with coarse punctations, entirely differ- 

 ent shape, fewer chambers, and in short the two have nothing in com- 

 mon except the limbate sutures, which in the Cuba specimen are more 

 a difference in texture of the wall than truly limbate in character. 



Brady's species, therefore, is an entirely different one from the 

 West Indian one described bv d'Orbignv. 



