42 BULLETIN 104, UNITED STATES NATIONAL MUSEUM 



Genus DENDRITINA d'Orbigny, 1826 



Dendritina d'Orbigny, Ann. Sci. Nat., vol 7, 1826, p. 285. — Cushman. 



Special Publ. No. 1, Cushman Lab. Foram. Res., 1928, p. 217. 

 Peneroplis (part) of Authors. 



Genotype, by designation. — Dendritina arhuscula d'Orbigny. 



Test similar to Peneroplis, the test usually thick and showing a 

 tendency to uncoil; aperture dendritic, in the apertural face. 



Eocene to Recent. 



The species of this genus are very highly developed in the Eocene, 

 but a few are found in the present oceans, especially in the Indo- 

 Pacific region. I have not found any Atlantic species belonging to 

 this genus. 



DENDRITINA ANTILLARUM d'Orbigny 



Plate 14 figures 2-5 



Dendritina antillarum d'Orbigny, Ann. Sci. Nat., vol. 7, 1826, p. 285, No. 3; 

 in De la Sagra, Hist. Fis. Pol. Nat. Hi.st., Cuba, 1839, " Foraminif^res," 

 p. 58, pi. 7, figs. 3-6. 

 Peneroplis pidchellum d'Orbigny, Voy. Am6r. M6rid., 1839, vol. 5, pt. 5, 

 "Foraminiferes," p. 32, p]. 3, figs. 5, 6. 

 This species described by d'Orbigny from the West Indies has 

 occurred in material from Bermuda. 



Genus SPIROLINA Lamarck, 1804 



Spirolina Lamarck, Ann. Mus., vol 5, 1804, p. 244. — Cushman, Special 



Publ. No. 1, Cushman Lab. Foram. Res., 1928, p. 217. 

 Peneroplis (part) of Authors. 



Genotype, by designation. — Spirolina cylindracea Lamarck. 



Test similar to Peneroplis, thick; early chambers close coiled, 

 usually not completely involute, later ones uncoiled; aperture rounded 

 terminal. 



Cretaceous (?) to Recent. 



This genus is especially well developed in the Upper and Middle 

 Eocene, but occurs also Recent, especially in warm, shallow waters of 

 the Indo-Pacific. There are but two species, so far as the material 

 examined shows, in the western tropical Atlantic, and these are very 

 rare. 



SPIROLINA ACICULARIS (Batsch) 



Plate 15, figures 1-3 



Nautilus (Lituus) adcularis Batsch, Conch. Seesandes, 1791, p. 4, pi. 6, 

 fig. 16a, b. 



Test with the earliest chambers close coiled but making only a 

 small portion of the test which in the adult is cylindrical or very 

 slightly tapering, circular in transverse section the chambers becoming 

 as high as broad ; sutures distinct, slightly depressed ; wall longitudin- 

 ally striate, translucent, thin; aperture consisting of one or more 

 pores in the middle of the terminal face. 



