FORAMINIFERA OF THE ATLANTIC OCEAN 131 



p. 2, pi. 1, fig. 4; vol. 54, No. 16, 1910, p. 27.— Cushman, Bull. 71, U. S. 

 Nat. Mus., pt. 5, 1915, p. 29, pi. 14, fig. 1. — Heron-Allen and Earland, 

 Trans. Zool. Soc. London, vol. 20, 1915, p. 705. — Cushman, Proc. U. S. 

 Nat. Mus., vol. 56, 1919, p. 627; Bull. 100, vol. 4, 1921, p. 311; vol. 59, 



1921, p. 55, pi. 12, fig. 8. — Heron-Allen and Earland, BuU. Soc. Sci. 

 Hist. Nat. Corse, 1922, p. 137; British Antarctic Exped., Zool., vol. 6, 



1922, p. 207. — Cushman, Publ. 311, Carnegie Instit., Washington, 

 1922, p. 45, pi. 6, fig. 3; Publ. 342, 1924, p. 37. 



Test typically adherent, composed of numerous chambers, early 

 ones spiral, later ones irregularly annular, those of the periphery 

 lobulated, the newly added chambers extending outward a con- 

 siderable distance beyond the preceding ones; ventral surface often 

 covered b}^ a mass of small acervuline chambers; wall conspicuously 

 porous; apertures lipped. 



Diameter of western Atlantic specimens up to 3 mm. 



There seems to be much question as to the actual identification 

 of d'Orbigny's P. vulgaris of the Cuban Monograph. A discussion 

 of this given in the paper on Jamaica is repeated here, as well as 

 the notes made on the Tortugas specimens. 



Tj^pical P. mediterranensis is now definitely known from the West 

 Indian region in shallow water. Goes, in 1882, records and figures 

 two forms under the name Planorbulina farda, var. vulgaris, of 

 w^hich figure 227 seems most like P. mediterranensis or P. vulgaris. 

 Figure 226, however, is P. acervalis H. B. Brady without any doubt. 

 These were both from the Caribbean. In 1896 Goes records Planor- 

 bulina again from the Caribbean as P. mediterranensis and places 

 his earlier P. farcta, var. vulgaris as a synonym, but figure 226 as 

 P. acervalis, as noted above. Goes gives the following not very clear 

 note (p. 74) : 



"A pygmy form of this species is not seldom met with in the 

 Caribbean Sea in 300 fathoms of water. A variet}^ of higher devel- 

 opment that Brady has described under a separate denomination 

 (P. acervalis) is also joined with the type, but of more rare occur- 

 rence." 



As both forms occur together, and one is a "pygmy form," it is 

 possible that this is but the young of P. acervalis. Flint *^ records 

 both species from the Gulf of Mexico, a single specimen of P. medi- 

 terranensis from Albatross Station D2377, and P. acervalis from 

 D2399 (number of specimens not given). The diameter of the 

 former is given as 1 mm., that of the latter 1.5 to 2.5 mm. The 

 specimen given as P. mediterranensis is evidently broken, from the 

 evidence of the figure. The accumulative evidence then shows that 

 P. acervalis is abundant in the West Indies and P. mediterranensis 

 very rare or of doubtful occurrence. 



<• Ann. Rep't. U. S. Nat. Mus., 1897(1899), p. 328. 



