30 SHALLOW-WATER FORAMINIFERA OF TORTUGAS REGION. 



As I have already noted in a previous paper on the Jamaican col- 

 lection (Proc. U. S. Nat. Mus., vol. 59, 1921, p. 52), d'Orbigny's 

 name of Clavulina tricarinata should be used for the West Indian 

 material. A study of the Tortugas collection more strongly confirms 

 this view. Specimens are very constant in their characters and agree 

 very closely with the original figure and description given by d'Or- 

 bigny, and undoubtedly the specimens referred from this region by 

 various authors to Clavulina angularis d'Orbigny should be really 

 C. tricarinata d'Orbigny. It is evidently the same as the species of 

 the tropical Pacific, and probably those of the Mediterranean are 

 Clavulina angularis d'Orbigny. It has occurred at numerous sta- 

 tions, but never in great abundance, so far as the collection shows. 



Clavulina sp.? 

 (Plate 3, Figure 4.) 



There is a single specimen from station 9 in very shallow water 

 (6 inches to 1 foot) from the lagoon on Long Key, which seems to 

 differ from anj'- of the other specimens of this genus obtained in this 

 area. A reference to the figure (pi. 3, fig. 4) will show that the early 

 portion is triserial and definitely triangular in transverse section, the 

 uniserial portion being circular throughout. It may be an aberrant 

 form of Clavulina tricarinata d'Orbigny. 



Clavulina nodosaria d'Orbigny. 



(Plate 3, Figures 1, 2.) 



Clavulina nodosaria d'Orbigny, in De la Sagra, Hist. Fis. Pol. Nat. Cuba, 1839, "Forami- 

 nif^res," p. 110, pi. 2, figs. 19, 20.— Cushman, Proc. U. S. Nat. Mua., vol. 59, 1921, 

 p. 53, pi. 12, fig. 3. 



Test small, elongate, tapering, the early portion triserial, later uniserial, 

 the uniserial chambers typically more or less rounded, especially the later 

 ones; chambers distinct, inflated; sutures depressed; wall finely arenaceous, 

 composed of translucent grains, with a small amount of cement, smooth; 

 aperture circular, with a simple tooth, usually projecting above the level of 

 'the aperture; color yellowish- or brownish- white. 



Length of the Tortugas specimens up to 0.75 mm. 



This species seems to be very distinct from C. tricarinata, not only 

 in its size, but also in the more rounded chambers, and especially 

 in the characters of the wall, which in C. tricarinata are thick and 

 heavy, with much cement and opaque; those of C. nodosaria being 

 very thin, with Httle cement and translucent. D'Orbigny's original 

 specimens were from Cuba and Martinique, and I have already re- 

 corded it from the north coast of Jamaica. In the Tortugas collec- 

 tion it has been found at a number of stations in considerable num- 

 bers and I have recorded it elsewhere off the coast of Florida. It is 

 a small, delicate species, hardly to be confused with any of the 

 others of the genus. , 



