no. 2360. FORAMINIFERA FROM JAMAICA— CUSHM AN. 77 



There is a difference even in the early stages of the development 

 of these two species, as I have shown. 15 



In this connection also it is interesting to note that d'Orbigny 

 records it as rare in Cuba, more common in Guadeloupe and St. 

 Thomas, but abundant in Jamaica. It may be that it is not widely 

 distributed. However, it is certainly abundant at the deeper station 

 at Montego Bay, occurring at stations 5 and 6 and also at Runaway 

 Bay. 



Fossil specimens occur in the Bowden Marl of Jamaica. 



ORBICULINA ADUNCA (Fichtel and Moll). 



Nautilus aduncus Fichtel and Moll, Test. Micr., 1803, p. 115, pi. 23. 

 Orbiculina adunca Lamarck, Tabl. Encyl. et Meth., 1816, p. 468, figs. 2a-c. — 

 d'Orbigny, Foram. Cuba, 1839, p. 64, pi. 8, figs. 8-16. 



This is probably the most abundant of the larger foraminifera of 

 the West Indies, making up a large proportion of the dredgings in 

 some places. It is most common at the deepest station, No. 10, but 

 occurs in numbers at stations 2 and 5, and also at Runaway Bay. 



Genus ORBITOLITES Lamarck, 1801. 



ORBITOLITES DUPLEX Carpenter. 



Orbulites macropora (?) Lamarck, Hist. Nat. Anira. sans Vert., vol. 2, 1816, p- 

 197, No. 5 (according to Carpenter). 



"Orbitolites (duplex type)" Carpenter, Philos. Trans., 1856, p. 120, pi. 5, fig. 



10; pi. 9, fig. 10. 

 Orbitolites duplex Carpenter, Rep. Challenger, "Orbitolites," 1883, p. 25, pi. 3, 



figs. 8-14; pi. 4, figs. 6-10; pi. 5, figs. 1-10. 



This is the only species which is found in the material from Jamaica, 

 and although both O. marginalis and O. complanata are recorded in 

 the Challenger Report from the West Indian region in deeper water, 



1 have found in the collections that I have seen that O. duplex is the 

 common species. It grows attached to the short eel grass in great 

 abundance with Planorbulina, and the young stages are easily seen 

 in this way. Specimens were found with megalospheric young in 

 the outer chambers of the parent test. 



Specimens occurred at Runaway Bay and at stations 2, 4, and 5 

 at Montego Bay. 



Genus ALVEOLINA d'Orbigny, 1826. 



ALVEOLINA PULCHRA d'Orbigny. 



Plate 19, figs. 7-9. 

 Alveolina pulchra d'Orbigny, Foram. Cuba, 1839, p. 70, pi. 8, figs. 19, 20. 



I am not sure that this species is the same as A. melo as Brady 

 places it, and as material for comparison is scarce, I place it under 

 d'Orbigny 's name. It occurred at Runaway Bay and at stations 



2 and 4 at Montego Bay. D'Orbigny's material was from Cuba. 



16 Bull. 71, U. S. Nat. Mus., pt. G, 1917, pp. 89-91. 



