FORAMINIFERA OF THE ATLANTIC OCEAN 33 



HETEROSTEGINA ANTILLARUM d'Orbignjr 



Plate 12, figures 1, 2 



Heterostegina antillarum d'Oubignt, in De la Sagra, Hist. Fis. Pol. Nat. 



Cuba, 1839, " Foraminifcres," p. 121, pi. 7, figs. 24, 25.— Cushman, Publ. 



311, Carnegie Inst. Washington, 1922, p. 57, pi. 10, fig. 5. 

 Heterostegina depressa (part) H. B. Brady, Rep. Voy. Challenger, Zoology, 



vol. 9, 1884, p. 746. 



Test comparatively small for the genus, close coiled throughout, not 

 complanate, greatest thickness in the umbonal region, thence sloping 

 to the subacute periphery; chambers strongly curved, narrow, the 

 outer portion divided up into a single row of chamberlets, those of 

 each chamber not connecting with one another; sutures distinct, 

 slightly limbate, not depressed; wall smooth; aperture consisting of a 

 few pores on the apertural face. 



Diameter, about 2 mm. 



D'Orbigny records this species from shore sands of Cuba and 

 Jamaica, but notes that he had but few specimens and that it is 

 apparently rare. It is worthy of note that the two stations at the Dry 

 Tortugas, off Florida, where I found the species, were both in ab- 

 normally warm water for the region, and it may be that the species is 

 only holding on in such favorable localities. I did not find it in 

 material from Porto Rico, Cuba, or Jamaica in the collections I have 

 examined from these localities. A single typical specimen from 

 Albatross Station D-2758, from the east coast of Brazil, in 20 fathoms, 

 shows that it has the same general distribution as others of the West 

 Indian fauna. More collecting will undoubtedly increase its known 

 distribution in the region. 



Heterostegina antillarum — Material examined 



Genus SPIROCLYPEUS H. Douville, 1905 



Spiroclypeus H. Douvill6, Bull. Soc. Geol. France, ser. 4, vol. 4, 1905, p. 

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

 213. 



Genotype, by designation. — Spiroclypeus orhitoideus H. Douville. 

 Test somewhat similar to Heterostegina but more accelerated, the 

 curved chambers divided into chamberlets beginning almost immedi- 



