112 



BULLETIN 104, UNITED STATES NATIONAL MUSEUM 



PLANUUNA CARIBAEA, new species 



Plate 20, figures 1 a-c 



Test planispiral or nearly so, much compressed, evolute, consisting 

 of about two and a half coils, periphery rounded, ventral side slightly 

 concave near the middle; chambers distinct, rather rapidly increasing 

 in size in the last part of the final coil; sutures distinct, slightly limbate, 

 joining with the slight keel, very slightly depressed on the ventral 

 side; wall smooth, on the dorsal side with the perforations very dis- 

 tinct, ventral side very finely perforate; aperture near the periphery, 

 small, low. 



Length of holotype, 0.42 mm.; breadth, 0.30 mm.; thickness, 

 0.06 mm.. 



Holotype (Cushman Coll. No. 13,143) from Montego Bay, Jamaica. 



This is an interesting and very distinct species which is probably 

 to be found widely distributed in the West Indian region. It most 

 closely resembles some of the species of the Australian region. 



There are various species assigned to Planulina by Ehrenberg 

 which do not belong in this genus. Numbers of these are from 

 Atlantic records, and it seems that many of them are Globorotalia 

 menardii (d'Orbigny) while others are probably some of the flatter 

 forms of Globigerina. The Atlantic ones may be noted here for 

 reference : 



Planulina ahyssicola Ehrenberg (Abhandl. Akad. Wiss. Berlin, 

 1872 (1873), pi. 1, fig. 15). Davis Strait, 9,240 feet in depth. 



P. depressa Ehrenberg (Abhandl. Akad. Wiss. Berlin, 1872 (1873), 

 pi. 1, fig. 20). Davis Strait, 6,000 feet in depth. 



P. diaphana EhrenheTg (Abhandl. Akad. Wiss. Berlin, 1872 (1873), 

 pi. 5, fig. 10). Gulf Stream, near Florida, 2,556 feet in depth. 



P. groenlandica Ehrenberg (Abhandl. Akad. Wiss. Berlin, 1872 

 (1873), pi. 1, fig. 17). Davis Strait, 10,998 feet in depth. 



